My om617 turbo motor "lightly freshen up" project has turned
into a complete top to bottom job. This engine had been sitting in the corner of a shop for who knows how many years.
The engine number is ground off!! However, the camshaft and cam
towers are the later, higher hp version, which is nice. Also, there's an extra pipe fitting on the oil pan. Trap oxidizer? I probably want to plug it.


Compression was 300's except for 2 in the middle which were about 125. They might have been my mistake, eg neglected the injector seals during test. When we opened it up, nothing seemed particularly out of place,
good head gasket seals, no coolant erosion, no scoring in the bores or on pistons, no broken rings or burned valves. The valves did have quite a ridge on them, and some exhaust valves were more wobbly in their guides
than others.

I have the head completely finished with new exhaust valves&guides.
The machine shop seems a little less certain what to do with the bottom end.

The bores are nicely round but at 90.93 before honing he says its just a hair outside of spec but will work, possibly make some smoke, so he's being very careful to not remove too much material for honing. Pistons
measure 90.86. I'm inclined to stay with this rather than invest in lines/boring/pistons. I want to get this beast put back and in the meantime keep looking for another core in better shape.

Ring gap on old rings appears fine.

The crank and rod bearing shells appear (to me, untrained eye) to be ok,
no noticable wear spots. He sent the crank to a specialist because he doesn't have that machinery. So today he tells me we need "10 under"
bearing shells (he talks in english not metric even though his shop is full of bmw engines!)
and we need the thrust washer in hand in order to measure and finish the crank. I suppose this all means that when they looked at the crank they found it to be not nice enough for a simple polish.
I called peachparts and they can special order if I know exactly what I want, but they kept saying things like
"we haven't sold parts for one of these in 10 years", which means I'm getting zero knowledge with my order, and I don't want to special order
parts with the chance that they are wrong.



So, I'm looking for help in asking the right questions and ordering the parts to reassemble the engine. I have pdf's of the workshop chapters
on sizes and oversizes, and I have the gasket kits for the top end and the lower end/oil pan etc's. Also, will take a recommendation for a machinist in the bay are who might speak more fluent om617.952

I've sent this message to mr Hunter too, because he has made some great
posts in the past, e.g. 274085-om617-952-rebuild-parts-list.html

thanks!