Have you rebuilt your own S85? - BMW M5 Forum and M6 Forums
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post #1 of 30 Old 5th February 2014, 04:45 PM Thread Starter
Destructo
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Have you rebuilt your own S85?

I know we have some handy people on here, but just out of curiosity, whom here has rebuild their own S85 engine? With the rob bearing issue, I know myself I'd rather just do a rebuild in my garage at the same time. Not only would it provide ample cost savings, but i'm a nit-pick for details and know no one else would take care of it like I could.

Anyone else with me? Done the rebuild yourself? Just our of curiosity what did you spend ball park if you don't mind.

Thanks guys!
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post #2 of 30 Old 5th February 2014, 05:59 PM
Revo
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Rod bearings are more or less a "bolt in" deal. A full motor rebuild for an S85 is definitely more invoked. Definitely not impossible cause a motor is a motor in the end, but definitely not something relatively simple like rod bearings.

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post #3 of 30 Old 5th February 2014, 06:06 PM Thread Starter
Destructo
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Maybe I'm more anal about these things than others. If i was putting in rod bearings I'd just want to do anything while I had it out and available. But I'm not necessarily right in the head.
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post #4 of 30 Old 5th February 2014, 06:09 PM
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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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post #5 of 30 Old 5th February 2014, 06:13 PM
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Forgot one thing~. There is $712 in TTY bolts on this engine. They all stretch upon reaching final spec and need to be replaced with new, just like conrod bolts. If you don't replace these, it's gonna be a bad day.


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post #6 of 30 Old 5th February 2014, 06:15 PM Thread Starter
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Awesome reply Troy. Thanks for the break down and information. Good to see a fellow Michiganer on here. I'm actually in the process of moving back to the West Michigan area. So it looks like I might have found a local resource when I do pull the trigger on an E60. Darn it! LOL!

If you don't mind I'd love to pick your brain sometime. It's always nice to have a local resource.

Thanks again!
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post #7 of 30 Old 5th February 2014, 09:16 PM
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no problem buddy,

Feel free to stop by any time. I can even show you the race shop that builds the S85 motors fro me. :-)
post #8 of 30 Old 6th February 2014, 03:23 AM
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so are you guys saying an amateur can do a rod bearing change?? I do the basics now on my beast such as: oil, spark plugs, water pump, pulleys etc….I'm wondering if I could conquer the bearing job myself….

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post #9 of 30 Old 6th February 2014, 03:44 AM
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I wish I could do rod bearings but I just don't have all the tools, space nor time

Now building your own engine .....that is something I left to a builder who has experience, tools, space and time
The tolerances on these engines are not like my little Japanese engine I once built.

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post #10 of 30 Old 6th February 2014, 04:02 AM
TROY JEUP
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Originally Posted by Smoorebmw View Post
so are you guys saying an amateur can do a rod bearing change?? I do the basics now on my beast such as: oil, spark plugs, water pump, pulleys etc.I'm wondering if I could conquer the bearing job myself.
I never said an amateur could do it.. I am just saying it is easy. But at the same time, this is coming from someone who has sold 79 S85 in the past 12-months.
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