Swapping out rod bearings will cost you around $850 for all the parts from rod bearings to bolts to vanos pump chain tensioners to oil pan gasket. This is a very simple task.
Trying to rebuild an S85, requires cylinder honing by a machine because the cylinders taper like hell at around 60k (not honing by hand).
New vanos pump, oil pump, vanos units on cylidners, cam caps, head gaskets, main bearings, front/rear seal, etc.
All said and done, the typical rebuild costs me $6,000 to have this done in parts and machining. This is aside from having purchased $1500 in BMW oem tools for timing and checking tolerances, etc. I sell the rebuilt motors with 0-miles on them for $10,000 to a customer.
The used motors we sell are from $6000 to $9000 depending on year and mileage. That is the reason 99% of the people who buy motor from us just want a used motor with new bearings & vanos line service that we offer for free with the purchase of a motor. We also warranty them for 2-years or 30k miles.
Rebuilding an S85 "correctly" will run you around $6000, and that is a spun-bearing motor. If the injector locked up, you are back another $2500 for sleeves in the block.
If you just throw it together and go the cheap route and try to flush the metal out of everything, it will probably get your cost down to around $2500 in parts. However, getting that motor to stay out of limp mode will be next to impossible. The motor is too smart and it knows if the motor had metal in the vanos units, solenoids, etc and it will stay in limp mode until you change those parts.
This is a $52000 motor for a reason and people don't rebuild them correctly for a reason, because the parts are too much money. This is no Chevy 350. ;-P
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