What is the construction and purpose of crankshafts?

Crankshafts are mechanical components mounted in the lower part of the engine, supported by main bearings in the block. They consist of main journals, crank journals, counterweights, and surfaces interacting with the flywheel and pulley. Their purpose is to convert piston motion into rotational motion and transfer loads generated during mixture combustion.

What are crankshafts used for?

Crankshafts are used to transfer energy from the piston-connecting rod assembly to further elements of the drivetrain. In addition to generating rotational motion, they work with the timing system, belt accessories, and the flywheel. Without a properly selected shaft, the engine does not maintain proper operating culture, lubrication, and mechanical synchronization.

What is the construction and function of crankshaft bearings?

Crankshaft bearings are thin-walled sliding elements mounted between the shaft journals and the seats in the block or connecting rod. Their function is to maintain an oil layer, reduce friction, and stabilize the operation of the rotating shaft. The selection of bearings depends on the journal diameter, any potential grinding, and the engine version, so they should be verified together with the shaft.

How to properly select a crankshaft for a specific engine?

The most important thing is to compare the engine code, OEM number, and interchangeable numbers. It is also worth checking the fuel type, part condition, gearbox version, and compatibility with the flywheel or dual-mass flywheel. For units after an overhaul, the journal dimension and whether the shaft works with standard or oversized bearings also matter.

What symptoms may indicate a problem with the crankshaft or its interaction?

Typical symptoms include metallic knocking from the lower part of the engine, excessive vibration, oil pressure drop, and uneven unit operation under load. In practice, the cause may be the shaft itself, worn bearings, improper lubrication, or a problem with the position sensor signal wheel. Therefore, it is worth basing the diagnosis on measurements and part compatibility, not just on a single symptom.

How to take care of crankshafts after installation?

The basis is regular oil and filter changes, monitoring lubrication pressure, and using the correct mounting elements. After installation, you should verify alignment, operating clearance, and interaction with seals, the pulley, and the flywheel. It is also good practice to check the condition of the oil pump and oil channels before starting the engine.

Crankshafts

At Global Parts, we offer a wide selection of original used car parts, including crankshafts for many popular car brands such as BMW, Mini, Mercedes, Audi, Volkswagen, and others. Each crankshaft we offer undergoes quality control to ensure you receive a top-quality product.

More information

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Crankshaft Reductor Wheel BMW E60 E81 E87 E90 N47 Engine Disc 7797492

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A6510353112

Vibration Damper Mercedes W176 W246 OM651 Engine Crankshaft Pulley A6510353112

€66.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 8515002

BMW F10 F11 F30 N57Z Diesel Vibration Absorber Damper Crankshaft Pulley 8515002

€47.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A2709050600

Mercedes W176 W204 W205 W213 W246 Crankshaft Position Sensor A2709050600

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A6510351012

Vibration Damper Mercedes W204 W212 OM651 Diesel Crankshaft Pulley A6510351012

€37.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A6510351912

Vibration Damper Mercedes W204 W212 OM651 Diesel Crankshaft Pulley A6510351912

€42.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 06M105019AG

Audi A4 S4 B9 3.0 TFSI Engine Crankshaft Petrol Shaft 06M105019AG

€474.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 7508547

BMW Mini Cooper R50 R52 W10 Engine Crankshaft Crank Shaft 04777684AA 1485832

€132.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 8200885209A

Mercedes W176 Crankshaft Position Sensor Engine 8200885209A

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A2720301701

Mercedes R171 W204 W211 Petrol M272 Engine Crankshaft Crank Shaft A2720301701

€189.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A6420300403

Vibration Damper Mercedes W204 W211 W212 OM642 Crankshaft Pulley A6420300403

€28.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 7595860

BMW F10 F20 F21 F30 F31 N20 Crank Shaft Position Sensor 7595860

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 7516040

BMW Z4 E85 E87 E88 E90 E91 E92 E93 Crankshaft Petrol N43B20A 318i Engine 7516040

€156.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 03D906433

VW Volkswagen 6R 1.4 CGGB Crankshaft Pulse Position Speed Sensor 03D906433

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A2720100614

Mercedes W204 W207 C209 C219 Crankcase Cylinder Rear Cover Panel A2720100614

€56.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 302420

BMW X5 E53 E60 E63 E65 Petrol N62 Engine Crankshaft Crank Shaft

€104.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 7792609-1

BMW E60 E61 X5 E70 E90 E91 M57N2 Diesel Engine Crankshaft Crank Shaft 7792609

€332.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 06F105243J-1

Audi A4 B7 Engine Crankshaft Belt Pulley Wheel 2.0 TFSI Petrol 06F105243J

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 06H103495AC

Audi TT 8J Crankcase Breather Hose Engine Pipe Line Oil Separator 06H103495AC

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A2730300701

Mercedes W221 Crankshaft Crank Shaft Petrol M273 Engine A2730300701

€284.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. RM6G9Q-6011-BB-1

Ford Transit Connect Engine Crankshaft 1.8 TDCI Diesel XS4Q-6303-AD

€94.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 7561273

BMW F20 F30 Mini Cooper R55 R56 R57 S Engine Crankshaft 7561273

€99.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 079103464F

Audi S5 8T Crankcase Breather Valve Oil Separator 079103464F

€47.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 06H103495AD

Audi TT 8J Crankcase Breather Hose Engine Pipe Line Oil Separator 06H103495H

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 03D906433A

Volkswagen Polo 6R Crankshaft Pulse Position Speed Sensor 1.2 Petrol 03D906433A

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 06E105101S

Audi A4 S4 B8 Engine Crankshaft Crank Shaft 3.0 TFSI Petrol CAKA 06E105101S

€1,011.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 7T1Q6K666AA

Ford Transit Connect Crankcase Breather Hose Engine Pipe Line 7T1Q-6K666-AA

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A2769050700

Mercedes W176 W246 Crankshaft Position Sensor OM651 Diesel Engine A2769050700

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 06E103547F

Audi A4 S4 B8 Crankcase Breather Hose Engine Pipe Line Oil Separator 06E103547F

€47.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. BK2Q6A886AC

Ford Transit MK7 Breather Hose Engine Pipe Line BK2Q6A886AC

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 06M103293AM

Audi S5 F5 Balance Shaft Gear Pulley Wheel 3.0 TFSI 06M103293AM

€56.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A2760301101

Mercedes A238 E450 OM276.823 4MATIC Engine Crankshaft Crank Shaft A2760301101

€664.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 13310-PWA-000

Honda City Civic Jazz Crankshaft Engine Crank Shaft Unit 13310-PWA-000

€94.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 04L906433B

Audi A4 B8 A5 8T 2.0 TDI Crankshaft Position Pulse Sensor 04L906433B

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 8511320-2

Crankshaft Pulley Mini R55 R56 LCI R60 R61 N47N Vibration Damper 8511320

€1,082.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A2640520000

Mercedes W176 C117 Crankshaft Gear Engine Position Chain Wheel M270 A2640520000

€32.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 079105251AL

Audi RS4 B8 RS5 8T Crankshaft Timing Belt Pulley 4.2 Petrol CFSA 079105251AL

€51.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A2769051400

Mercedes W176 W205 W213 C238 C253 Crankshaft Position Sensor A2769051200

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A0061533628

Mercedes W203 W204 W212 M271 Petrol Engine Crankcase Knock Sensor A0061533628

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 8638614-2

Vibration Damper BMW F45 X1 F48 Mini F55 F56 B36 B38 Crankshaft Pulley 8638613

€80.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 05EALTF

Volkswagen VW Golf Mk8 Crankshaft Crank Shaft 1.5 TSI DADA 05EALTF

€237.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A0009056205

Mercedes W177 W247 M260 Petrol Knock Sensor Engine Crankcase A0009056205

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A6110300503

Mercedes W202 W204 W211 Vito W639 OM611 OM646 Crankshaft Pulley A6110300503

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 06E105101AK

Audi A4 B8 S5 8T Engine Crankshaft Crank Shaft 3.0 TFSI Petrol 06E105101AK

€788.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 06H105243K

Audi S3 8V 2.0 TFSI DJHA Petrol Engine Crankshaft Pulley 06H105243K

€28.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 034120121

Volkswagen Golf Mk8 Crankshaft Crank Shaft 2.0 TDI Diesel Engine 034120121

€332.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A6510301372

Mercedes C117 W176 W205 Balance Shaft A6510301372

€118.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A2780500305

Mercedes W166 W204 W212 Intermediate Sprocket Gear Wheel A2780500305

€70.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A6510110700

Mercedes W176 W246 Crankshaft Housing Balancer OM651 A6510110700

€47.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A6510110800

Mercedes W176 Engine Crankshaft Balancer Block A6510110800

€47.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 7787237

BMW E60 E65 E83 E87 E90 E91 Diesel M47N2 M57N2 Crankshaft Wheel Ring 7787237

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. BK2Q-6303-AA-2

Ford Transit Mk7 Mk8 Crankshaft 2.2 TDCi Diesel Engine BK2Q-6303-AA

€142.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 03D103306B

VW Polo 6R Skoda Fabia 5J Crankshaft Gear Pulley Wheel 1.2 CGPA CGPB 03D103306B

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 03G105021C

Audi A4 B7 A5 8T A6 C6 VW Passat B6 Diesel Engine Cranshaft 03G105021C

€450.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A6549053000

Mercedes W177 W213 W247 W256 W654 W656 Crankshaft Position Sensor A0031532828

€28.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 057109116H

Audi Q7 4L Touareg 7L Crankshaft Oil Pump Chain Sprocket 3.0 TDI 057109116H

€28.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 06H906433C

Crankshaft Position Sensor Audi A3 8V A4 B8 Q5 8R Pulse Generator 06H906433C

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 7597422

BMW F20 F21 Z4 E89 Vibration Damper Crankshaft Pulley 7597422

€47.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 8654276

BMW E81 E87 LCI 116i N43B16AA Engine Crankshaft 8654276

€332.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A2710300203

Mercedes W204 C207 W212 Crankshaft Vibration Damper Pulley A2710300203

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A0041539028

Mercedes W203 W204 W212 M272 Petrol Engine Crankcase Knock Sensor A0041539028

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A2819051000

Smart C453 Crankshaft Position Pulse Sensor 281920 A2819051000

€28.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 03D103305E

VW Polo 6R Skoda Fabia 5J Crankshaft Belt Drive Pulley Wheel 1.2 CGPA 03D103305E

€56.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 7614690

BMW 1 3 Series F20 F30 LCI Ventilation Pipe Hose Vent Tubing 7614690

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A2700320347

Mercedes W176 W204 W205 C207 W212 Crankshaft Ring Wheel A2700320347

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 04LCBBBGB

Audi A4 B9 Engine Crankshaft Crank Shaft 2.0 TDI Diesel Engine 04LCBBBGB

€446.95

Free delivery: Aug 5 – 10

If paid before 14:00

Mercedes CLK SLK W208 3.2 Petrol M112 Engine Crankshaft R11205

-0%

Part no. R11205

Mercedes CLK SLK W208 3.2 Petrol M112 Engine Crankshaft R11205

Promo price

€104.95

€104.45

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A6510301901

Mercedes W204 W207 W212 Crankshaft OM651 Diesel Engine Crank Shaft A6510301901

€849.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 7614548

BMW E60 E87 E90 F10 Petrol Engine N52 N52N N53 Crankshaft 7529074

€237.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A2710300003

Mercedes-Benz C E W203 W204 W211 Petrol M271 Crankshaft Pulley A2710300003

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A0009057304

Mercedes W177 M282 Petrol Engine Crankcase Knock Sensor Unit A0009057304

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 06E103547N

Audi A4 B8 A5 S5 8T Crankcase Breather Hose Engine Pipe Oil Separator 06E103547N

€56.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A2720301501

Mercedes W204 W212 C219 M272 Petrol Crankshaft Pulley A2720301501

€835.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 03D103306B-1

VW Polo 6R Skoda Fabia 5J Balance Shaft Gear Pulley Wheel 1.2 CGPA 03D103306B

€32.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 8671497

Mini F56 B38A15A Petrol Engine Crankshaft 8671497

€284.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 038105278A

Audi A4 B7 A4 B8 VW Golf 1K Transporter Crankshaft Pulley Cover 038105278A

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A2820100201

Mercedes W177 W247 Petrol M282 Engine Cover Head Rocker Panel A2820100201

€56.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 04L103493-1

Audi A3 8V Seat Leon Mk3 1.6 TDI Engine Breather Hose Engine Pipe Line 04L103493

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 03CAK

Volkswagen Golf 1k Crankshaft Crank Shaft 1.6 Petrol BLF 85KW 03CAK

€146.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A2769050300

Mercedes W204 W212 M276 Petrol Engine Crankcase Knock Sensor A2769050300

€28.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 03L103493AE

Volkswagen VW Golf VI Crankcase Breather Hose Engine Pipe Line 03L103493AE

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 1329202

Vibration Damper Ford Transit Mk6 Diesel Crankshaft Pulley Wheel 1329202

€28.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 8511320

Mini R55 R56 LCI R60 R61 N47N Vibration Damper Crankshaft Pulley 8511320

€146.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 9X2Q-6C315-AB

Jaguar XF250 Crankshaft Position Sensor 3.0 Diesel 9X2Q-6C315-AB

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A2720181382

Mercedes W204 M272 Crankcase Breather Hose Engine Pipe Line Petrol A2720181382

€37.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 7T1Q6K869AB

Ford Transit Connect 1.8 TDCi Crankcase Breather Vent Pipe Hose 7T1Q6K869AB

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 7L5905381

Porsche Cayenne 9PA Crankshaft Position Sensor Control Unit 7L5905381

€28.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 204EAM

VW Volkswagen Polo V 6R Engine Crankshaft 1.2 TSI CJZC 204EAM

€123.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 7520131

MINI Cooper S R52 R53 W11 Petrol Engine Piston Connecting Rod Crankshaft Conrod

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 7534732

Mini One R55 R56 N12 1.4 N12B14A Engine Crankshaft Crank Shaft 7534733

€37.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 9M5Q6A886AF

Ford Mondeo MK3 2.0 TDDi Crankcase Breather Vent Pipe Hose 9M5Q-6A886-AF

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A0009057303

Mercedes W204 Engine Crankcase Knock Sensor Ping A0009057303

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A6510351712-1

Vibration Damper Mercedes W906 OM651 Diesel Crankshaft Pulley A6510351712

€28.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A1120302601

Mercedes CL203 W163 W203 M112.940 Crankshaft A1120302601

€113.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 95510230360

Porsche Cayenne 92A Crankshaft Spacer Shim 1.5mm 4.2 V8 95510230360

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. BK3Q-6B319-CB

Ford Transit Mk7 Vibration Damper Crankshaft Pulley Wheel Diesel BK3Q-6B319-CB

€23.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 04L105021F

Volkswagen Caddy MK3 Golf Mk7 Crankshaft 2.0 TDI 04L105021F

€341.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. 03DETL020

VW Volkswagen Polo V 6R 1.2 TSI CGPB Engine Crankshaft 03DETL020

€94.95

Free delivery: Aug 5 – 10

If paid before 14:00

Part no. A1120500204

Mercedes CL203 M112 Camshaft Gear Pulley A1120500204

€94.95

Free delivery: Aug 5 – 10

If paid before 14:00

Showing 1-99 of 256 products

Wide selection of crankshafts – BMW, Audi, Mercedes, Volkswagen, and more

How to choose the correct crankshaft for your vehicle?

A crankshaft is one of the most important components of any engine, responsible for converting the reciprocating motion of the pistons into the rotational motion that drives the vehicle's wheels. Its precision and durability have a direct impact on engine performance and longevity. In the Global Parts automotive store, you will find a wide selection of used car parts, including crankshafts tailored for brands such as BMW, Audi, Mercedes, Volkswagen, Mini, and others. Crankshafts used in brands such as BMW, Audi, or Mercedes differ in design depending on the engine generation, journal diameter, and number of cylinders. For example, the BMW N57 crankshaft used in 3.0d units weighs approximately 22–24 kg and features a specific crank geometry adapted for high torque exceeding 560 Nm. In turn, the M54B30 crankshaft is a lighter construction designed for the naturally aspirated 3.0 R6 unit, with operating torques around 300 Nm. Thanks to these differences, the crankshaft ensures optimal fit to the engine's characteristics, and its compatibility with accessories (pulley, bearings, position sensor) is crucial for the proper operation of the unit.

Construction and significance of the crankshaft

A crankshaft is an engine component that performs several key functions:

Energy conversion – it transforms the linear motion of the pistons into rotational motion, which is transmitted to the drivetrain.
Force distribution – the crankshaft balances the forces generated during engine operation, ensuring smooth performance.
Accessory drive – through connections with belts and pulleys, the crankshaft drives other systems, such as the alternator or water pump. Precise manufacturing of the crankshaft and its proper lubrication are crucial for reliable engine operation.

Construction and purpose of crankshafts

Crankshafts are basic mechanical components mounted in the lower part of the engine, inside the block, on main bearings. Their task is to receive force from the pistons via connecting rods and convert reciprocating motion into rotational motion. A typical shaft consists of main journals, crank journals, counterweights, a front journal for the pulley, and a rear end that works with the flywheel or dual-mass flywheel. Crankshafts can be forged or cast. Forged shafts, used in more powerful BMW variants (e.g., N57S), are characterized by greater torsional resistance and work with higher maximum combustion pressures. Cast shafts (popular in, for example, 1.6–2.0 VAG group engines) are lighter and cheaper, making them ideal for units with lower dynamic loads. In practice, both types ensure proper engine operation, provided they are correctly matched to the design of the given model.

Comparison of crankshaft variants and data to check

Variant	Characteristics	Cooperating elements	What to check before purchase
Forged shaft	Used in units with higher loads and greater torque, usually with increased torsional resistance.	Main and connecting rod bearings, pulley, flywheel, seals.	OEM number, engine code, journal diameters, condition of working surfaces, compatibility with power version.
Cast shaft	Found in many mass-produced petrol and diesel units, selected for specific block and accessory designs.	Connecting rods, bearings, position sensor, pulse wheel, seals.	Fuel type, OEM part number, arrangement of sensor interaction points, year compatibility.
Shaft for a specific engine version	May differ in the number of throws, journal dimensions, and accessory mounting details depending on the unit generation.	Engine block, oil pump, timing, dual-mass flywheel or clutch.	VIN, interchangeable numbers, gearbox version, compatibility with engine blocks.

How to properly select a crankshaft for your vehicle?

The process of selecting a crankshaft can be presented in four simple stages:

Identification of the power unit – the most important thing is the engine code, e.g., N57D30A, M54B30, or OM651 in Mercedes.
Analysis of technical parameters – length of crank arms, diameter of main journals, number of throws.
Accessory compatibility – matching with the dual-mass flywheel, sealing rings, and sensors.
Verification of mounting fit – shafts differ depending on the year, power version, and gearbox (e.g., ZF automatic vs manual). This ensures precise selection and allows for the installation of the correct model, such as the BMW E46 crankshaft, which appeared in several engine versions with different journal diameters.

Selection, compatibility, and cooperating elements

Crankshaft selection should be based on the OEM number, interchangeable numbers, and the exact designation of the power unit. The crankshaft works directly with engine, main, and connecting rod bearings, connecting rods, the flywheel, and seals, so compatibility must include not only the journal dimensions but also the way it interacts with other parts. When choosing an element like a crankshaft position sensor, you must additionally compare the position of the signal wheel and the housing version, as this affects the shaft position reading.

Why is it worth taking care of the crankshaft?

The crankshaft is constantly exposed to high mechanical and thermal loads, which makes regular inspection and maintenance essential. Neglecting this component can lead to:

Engine damage resulting from excessive friction or overheating.
Uneven engine operation, power loss, and increased fuel consumption.
Serious failures that may require costly replacement of the entire drivetrain. At Global Parts, we offer original used crankshafts that have undergone detailed quality tests, ensuring their full functionality. Modern crankshafts operate at speeds reaching up to 6,000–7,000 rpm in R6 engines and over 4,000 rpm in diesel units. The surface of the main journals is induction-hardened, reaching a hardness of up to 55–60 HRC, which allows for many years of operation. Proper lubrication maintains an oil film only 0.02–0.05 mm thick, which protects against friction and maintains the stability of the shaft's operation.

The role of lubrication and bearings in crankshaft operation

Crankshaft bearings are precision sliding elements that separate the shaft journals from the seats in the block and connecting rods with an oil film layer. Their task is to reduce friction, maintain rotational alignment, and absorb loads generated during piston operation. Therefore, during an overhaul, it is worth assessing the condition of cooperating connecting rods and parts, as well as verifying the lubrication flow and compatibility with oil pumps and parts.

How to choose the right crankshaft?

When choosing a crankshaft, pay attention to several key factors:

Compatibility with the vehicle model – every engine has unique design requirements. At Global Parts, you will find crankshafts matched to BMW, Audi, Mercedes, Volkswagen, Mini, and others.
Technical condition – a used crankshaft should be free of cracks, signs of wear, and deformations.
Operational history – it is important that the shaft comes from a vehicle with a known service history, which guarantees its durability.

Table of parameters and compatibility

Below are examples of differences between popular crankshafts used in BMW:

Engine model	Example shaft weight	Material	Type	Compatibility with models
M54B30	approx. 20–21 kg	Cast steel	cast	BMW E46, E39, E60 (3.0 R6)
N57 3.0d	22–24 kg	Forged steel	forged	BMW F10, E70, F01 (3.0d)
N57S (M550d)	approx. 25 kg	Reinforced forged steel	forged	Special M Performance versions

Why choose used crankshafts?

Used car parts, such as crankshafts, are an excellent solution combining savings with high quality. By choosing used crankshafts, you gain:

Lower costs – used components are significantly cheaper than new ones but offer equally high quality.
Ecology – recycling car parts helps reduce automotive waste.
Wide selection – in our store, you will find crankshafts for the most popular car brands. Used crankshafts, such as those offered at Global Parts, come from fully functional power units and are checked for straightness, journal tolerances, and compatibility with standard or oversized bearings. Such shafts may have micron-level wear differences – standard tolerances are 0.01–0.03 mm, which still falls within the factory operating parameters of many units. Thanks to this, they are a fully functional and economical solution.

How to take care of the crankshaft?

To ensure the crankshaft works reliably for years, it is worth following a few rules:

Regularly change engine oil and filters to ensure proper lubrication.
Check the condition of the crankshaft bearings to prevent excessive wear and vibration.
Monitor the tension of drive belts, which can affect the shaft's operation. If you need to replace a crankshaft, at Global Parts you will find suitable used auto parts that will restore your vehicle to full efficiency. The durability of the shaft is also influenced by the proper matching of other system elements: the oil pump, lubrication channels, and main bearings. In some engines – like the BMW N57 – a variable displacement oil pump is used, which adjusts pressure to the load. In M54 units, the correct operation of the oil separator is crucial, as it maintains stable lubrication at high speeds. Thanks to this, the crankshaft operates under optimal conditions.

FAQ

Question	Answer
What is the construction and purpose of crankshafts?	Crankshafts are mechanical components mounted in the lower part of the engine, supported by main bearings in the block. They consist of main journals, crank journals, counterweights, and surfaces interacting with the flywheel and pulley. Their purpose is to convert piston motion into rotational motion and transfer loads generated during mixture combustion.
What are crankshafts used for?	Crankshafts are used to transfer energy from the piston-connecting rod assembly to further elements of the drivetrain. In addition to generating rotational motion, they work with the timing system, belt accessories, and the flywheel. Without a properly selected shaft, the engine does not maintain proper operating culture, lubrication, and mechanical synchronization.
What is the construction and function of crankshaft bearings?	Crankshaft bearings are thin-walled sliding elements mounted between the shaft journals and the seats in the block or connecting rod. Their function is to maintain an oil layer, reduce friction, and stabilize the operation of the rotating shaft. The selection of bearings depends on the journal diameter, any potential grinding, and the engine version, so they should be verified together with the shaft.
How to properly select a crankshaft for a specific engine?	The most important thing is to compare the engine code, OEM number, and interchangeable numbers. It is also worth checking the fuel type, part condition, gearbox version, and compatibility with the flywheel or dual-mass flywheel. For units after an overhaul, the journal dimension and whether the shaft works with standard or oversized bearings also matter.
What symptoms may indicate a problem with the crankshaft or its interaction?	Typical symptoms include metallic knocking from the lower part of the engine, excessive vibration, oil pressure drop, and uneven unit operation under load. In practice, the cause may be the shaft itself, worn bearings, improper lubrication, or a problem with the position sensor signal wheel. Therefore, it is worth basing the diagnosis on measurements and part compatibility, not just on a single symptom.
How to take care of crankshafts after installation?	The basis is regular oil and filter changes, monitoring lubrication pressure, and using the correct mounting elements. After installation, you should verify alignment, operating clearance, and interaction with seals, the pulley, and the flywheel. It is also good practice to check the condition of the oil pump and oil channels before starting the engine.

Summary: crankshafts at the Global Parts automotive store

Crankshafts are a fundamental element of every engine, affecting its performance, durability, and reliability. The Global Parts offer includes used parts for many power units, including solutions tailored for brands such as Mercedes, Audi, BMW, and others. When choosing, it is worth comparing the OEM part number, interchangeable numbers, technical condition, and compatibility with the engine code and cooperating accessories. We invite you to contact us – we are here to help! For more information and interesting facts, we also invite you to visit our automotive blog.

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