Engines and Components› Engine Bearings
King Engine Bearings
King Engine Bearings Mercedes Benz M103 / M104 / OM603 Bi-Metal Aluminum Main Bearing Set
SKU: K006 MB7721AM
Easy — 1–2 hours
Description
Fitment
Fitment Guaranteed
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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.
Available on iOS & Android
Specifications
| Brand | King Engine Bearings |
| Part Number | K006 MB7721AM |
Videos
King Engine Bearing & Crankshaft Installation Guide Feat. XP Bearings
Main Bearings Installation
Everything you need to know about Engine/Main Bearings
Restored the 1988 Mercedes Benz M103 Engine
Change Main bearings with crankshaft still installed
Adding Oil On The Back Side Of Bearings During Engine Assembly. Good Or Bad?
Engine Bearing Tech Myths | What You Really Need To Know
What So Special About 90s Mercedes Engines? If Your Tuning -You NEED To See This! M102 M103 M111/104
How To Replace Engine Main Bearings.
Buy with Confidence
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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