Discussion Starter · #1 ·
I’m having a hard time finding the procedures and info about rebuilding the S85 and repairs anyone know a good source
Newtis.info or ISTA will have the documentation for any bmw repair procedures.I’m having a hard time finding the procedures and info about rebuilding the S85 and repairs anyone know a good source
No just found a project M5 in California for a good price and needs a motor rebuild since it has a couple bent rods, I own a 545i snd just looking for a new projectNewtis.info or ISTA will have the documentation for any bmw repair procedures.
There's a couple YouTube videos with engine teardowns as well. I don't think there is an extensive step by step build up video but I only searched Google for maybe 30 seconds.
Why the rebuild? Are you a new E60 owner or building the S85 for a swap?
Agreed and a new block is 1000 by itselfat the risk of saying something you may already know... bent rods == likely cylinder wall damage == need new block since you can't machine an AluSil block.
huh, less than i thought. realistically though you probably need a new long block as there's likely shrapnel everywhere.Agreed and a new block is 1000 by itself
Agreed.You’re not going to have one page that’s titled “engine reassembly” or whatever. But everything should be there in steps. Think like you’re assembling any other engine and search for what step you’re on. For example, there’s repair instructions for “replacing the piston rings on all pistons” (document 11 21 671). Another page is “removing and installing/replacing all pistons” (document 11 25 530). Anything that requires torques or replacing tty fasteners will have those requirements in a table linked in the page.
ISTA and newtis will have the same info, I prefer newtis most times because it’s quick to access and I can do it on any device with a web browser. I just looked up those two pages above on my phone.
A junk block maybe. For a 'new' block you're missing a digit.Agreed and a new block is 1000 by itself
@kolosy, in theory machining is possible - can you ellaborate?... since you can't machine an AluSil block.
@herrubermensch when did u say you're going to start tackling S85s?I think while technically feasible (I've seen that doc before), it's practically impossible to find a shop with experience doing this.
Historically, we have done S85 block conditioning and even sleeving. In fact, we have one S85 sleeve job left to do for a board member. But I about a year or so ago, I moved the operation solely to building engines and machine work for those builds; we won't do the machine work on a one-off basis. We will do S62, S54, S65, and S85 shortblocks, longblocks, cylinder heads, and fully dressed PNP engines, but nothing less than any of those. So the answer is: Now!@herrubermensch when did u say you're going to start tackling S85s?
You are welcome. Please forgive my verbosity, but I love this stuff!Thank you for the information
Using a torque plate also helps oil usage
What is your opinion of iso polishing cranks??
You are welcome. Please forgive my verbosity, but I love this stuff!
Indeed it does. Out of round cylinders necessarily allow more blowby.
We REM polish all but journals, then use cork polishing bands with a hand held electric polisher to polish the journals. That does not effect any material dimensional change in the diameter of the crank journals. If any such change is necessary, we generally will use a different crank, as crank grinding is rarely done well or accurately, and when it is, it is prohibitively expensive, more so than using a new crank.
I stand by my comment.Lang racing welds and regrinds cranks for $800