Product Description
MAHLE / Clevite MS-2218P-.50MM P-Series main bearing set for the 2001–2016 GM 6.6L Duramax (LB7/LLY/LBZ/LMM/LML). P-Series bearings use Clevite’s tri-metal TM-77 construction and a full-groove main for improved oiling under load. Size: .50 mm undersize. Thrust washer set sold separately and the crankshaft must be re-hardened (nitrided) when using this undersize set.
- Series: Clevite P-Series
- Material: TM-77 tri-metal
- Size: .50 mm undersize
- Set includes 10 main bearings
Fitment
- 2001–2016 GM 6.6L Duramax: LB7, LLY, LBZ, LMM, LML (Ram 2500/3500 HD platforms & related)
- Model coverage examples: Silverado/Sierra 2500HD & 3500/3500HD (2001–2016), Express 2500/3500/4500 vans (select years), Kodiak C4500/C5500 (2003–2007).
Cross Reference / IDs
- MPN: MS2218P50MM (aka MS-2218P-.50MM)
- UPC/GTIN: 027067379832 AutoPartsO
- Alternate formatting seen as: MS2218P.50 (retail catalog style)
- Cross-brand label: Michigan 77 MS2218P50MM (legacy branding)
- Related parts: Thrust Washer Set TW-610S (required, sold separately).
Notes
- Full-groove main for maximum oil flow; higher crush for retention; reduced overlay thickness to mitigate fatigue.
- Undersize bearings require proper crank reconditioning and nitriding per manufacturer notes.
Will these fit my Duramax?
Yes—fits all 6.6L Duramax engines from 2001–2016 (LB7/LLY/LBZ/LMM/LML).
Do I need a thrust washer set?
Yes—order Clevite TW-610S separately.
Why does the listing say “.50 mm undersize”?
Your crank main journals are ground .50 mm during reconditioning; this bearing size restores proper oil clearance.
Any special machining?
Follow the manufacturer note to re-harden (nitride) the crank when using this undersize set and verify clearances.
