Crankshaft end float SL230 MB exchange engine

[Esmo]

Advice needed regarding limits , I understand the limit is 0.20 mm-0.35 mm but we have 0.65 mm .
I understand that only the standard thrust bearing is available with no oversize option.
The M127 is on no.3 and will not turn on No.2 any advice will be greatly appreciated.

[Benz Dr.]

I've had to carefully remove a bit of material from the front-facing side of the bearing until I obtained the correct fit. Don't touch the back-facing side because the crank will run against that area as the engine runs. Cranks have a tendency to slide forward as they run so leaving the perfectly true side on the bearing for the crank to run on is a good idea.

[stickandrudderman]

Advice needed regarding limits , I understand the limit is 0.20 mm-0.35 mm but we have 0.65 mm .
I understand that only the standard thrust bearing is available with no oversize option.
The M127 is on no.3 and will not turn on No.2 any advice will be greatly appreciated.

Two things:
It wouldn't be the first time someone has mis-assembled the engine so the thrust bearings are not mounted on the correct journal.
Oversize bearings have oversized thrust faces. The crank should be machined at the thrust face as well as the journal to accommodate the larger bearing.

[Esmo]

Thanks for your reply’s Benz Dr and Stick ,just to confirm which journal no.2 or no.3. ? Also are all thrust sizes the same regardless of the bearing size .

[ja17]

The thrust width increases as the bearing undersize increases. Not sure what the increments are off hand. Manual transmission cars tend to wear the thrust more than automatics since every time you depress the clutch pedal, you are pushing the crankshaft forward! I always supply my machinist with the thrust bearing before he grinds the crankshaft, in this way, he can clearance the thrust bearing exactly to specs.