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Genuine BMW Petrol Engine Crankshaft & Piston Set

Part Number(s): 5A24670 / 8671502
Condition: Brand OEM

Engine Type:

BMW B48B20A – 2.0L 4‑Cylinder Turbo Petrol

Vehicle Compatibility (Common Models):

BMW 1 Series (F40)
BMW 2 Series (F44, G42)
BMW 3 Series (G20, G21)
BMW 4 Series (G22, G23, G26)
BMW X1 (F48) / X2 (F39)
BMW X3 (G01) / X4 (G02)
(Check your VIN and part number for exact compatibility)

Function:

Here’s what 5A24670 refers to:

BMW OEM Part: Engine piston
Full BMW PN: 11 25 5 A24 670 (11255A24670).
Engine compatibility: Designed for the B46/B48 2.0-liter turbo engines used across many models (typical applications include 1/2/3/4/5/7 Series and X1/X2/X3/X4/Z4 in 20i/30i trims, depending on market and year). Always confirm by VIN.
Size/specs (STD piston):
• Bore: 82.00 mm
• Wrist/piston pin: 22 mm (Φ22)
• Ring thickness: 1st 1.2 mm, 2nd 1.5 mm, oil ring 2.0 mm
• Compression ratio (typical B48 spec): ~10.2:1
(Specs as listed for 11255A24670 piston kits.)

Vehicle Compatibility

This crankshaft fits a wide range of BMW models equipped with the B48B20A engine variant, including:

BMW 1 Series (F40)
2 Series (F44, G42)
3 Series (G20, G21)
4 Series (G22, G23, G26)
X1 (F48) / X2 (F39)
X3 (G01) / X4 (G02)

Other sources point to compatibility across more models like 2 (F45), 3 (G20), 5 (G30, G31), 6 (G32), 7 (G11, G12), X1 (F48), X2 (F39), and Z4 (G29) dating from around 2016–2019.

Crankshaft Size & Weight Details

The new crankshaft alone (part 8671502) weighs approximately 14.76 kg.

Summary Table

Specification	Details
Part Name	Crankshaft (BMW OEM)
Part Number	8671502 (also found as 11218671502, 8471863 in some references)
Engine Compatibility	BMW B48 / B48B20A — 2.0 L turbocharged 4-cylinders
Vehicle Models	1, 2, 3, 4, X1/X2, X3/X4 (and possibly 5, 6, 7, Z4 depending on source)
Manufacturing Status	Brand OEM component
Weight	~14.76 kg (new crankshaft alone)

Bundled with Pistons?

Yes—there are listings that offer a combined crankshaft (5A24670) and piston set (8671502) as a single kit ready for engine re-builds.

Next Steps — To Ensure Exact Fitment

Share your BMW's VIN — that’s the most reliable way to confirm vehicle-specific compatibility.
Confirm whether you need just the crankshaft or also the matching pistons, especially if you're performing a full engine rebuild.