2002MotorRebuild

From John Clarke Mills Project Wiki

My 2.0 liter M10 BMW 4 cylinder motor is being rebuilt by Terry Tinney in Livermore, CA. The modifications include:

Bead blasting
Decking
Honing
Polishing
Reground more aggressive cam, 280 degrees
Mahle 9.5:1 high compression cast pistons
New bearings, seals, rings
Sachs performance clutch kit
Complete balancing

As many of you know I pulled the motor earlier which I also documented here. I definitely have to thank my friend Duane for helping me on this one. Anyway, onto the photos.

Here are two pictures of the engine when I cracked it open
As you can tell, the piston rigs were worn badly, allowing oil to seep into the combustion chamber. It was especially bad on cylinders 1 and 2. Turns out one of the exhaust guides was worn allowing the valve to flap around which slightly damaged the valve and the head. Other than that, the engine was in really good shape. Notice the water passages on the head - perfect.

Here is the engine before the final rebuild
I had to visit terry at the shop because he had bead blasted my manifold which I then took home to bore out and paint.