91 M5 Engine Comments - BMW M5 Forum and M6 Forums
E34 M5 Discussion 1988-1995 Sedan and Touring

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post #1 of 24 Old 1st November 2011, 07:57 AM Thread Starter
MarinM5
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91 M5 Engine Comments

I have had or currently own 3 M5s--loyal "board" reader and member
I curently own a E39 M5 Dinan and owned an E28M5
I had a chance last year to buy a interior pristine 91 E34M5 Alpine white
I added H & R springs and Dinan designed Koni shocks, and it has Dinan chip
Have found the E34 is a perfect "mix" between an E39 and E28/now my E34M5 is daily driver but...

Recently, at 150,000 miles, engine dropped a quart of oil per 1000 miles, and the transmission leaks oil

So took car to Dinan and they found that compression for all 6 at 160 and leakdown less than 10%

Engine comes out, and no obvious problems upon visual inspection for lower half was evident, such as excessive wear, metal shavings in the oil pan.
So cylinder head was removed and sent to machine shop
Machine shop examined cylinder head and presssure tested
They found no obvious damage to the block, crankshaft, piston etc, including no lip on the top of the cylinder walls

So based on condition reflected in attached pics, machine shop recommends a valve job, including replacement of oil pump, timing chain, tensioners, termostat, seals. gaskets etc, while the engine is partially taken apart.

So question for those of you who have gone throught this, do the attached pictures reflect a need to go further, or take apart everything and send the block out. Problem is Bavarian OEM biz does not sell remanfactured engines any more this car, and BMW does not sell not only engine but lower block parts, so I am told.

Comments thoughts?
Am i going in apparently the right direction?
I am not going to "track" this car, but want it for 75-90K miles in next 3-4 years, and will drive it hard on mountain twisty type roads hard at high rev.

Thanks for input
Marin M5 (bob)
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post #2 of 24 Old 1st November 2011, 10:39 AM
Jon Baker
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Bearing in mind everything is already in pieces i would replace as much as you can / want to afford before putting her back together. This alone should make the engine last at least another 100k miles.

The oil usage you mention doesn't sound that excessive, other board members have noted they use similar amounts whilst their engines are running fine.

Recondition - Replace - Rebuild = Continue enjoying E34 ownership!!
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post #3 of 24 Old 2nd November 2011, 12:11 AM
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i would imagine they'd at least inspect the rod and main bearings while it's apart. I'd strongly consider replacing them (maybe they are and i missed that).

Mike

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post #4 of 24 Old 4th November 2011, 03:54 AM Thread Starter
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91 M5 Engine Condition

Thank you for both of your comments.
As for the oil usage, I should have mentioned that when the engine got warmed up, I could smell a very definite "oil burn" smell from the right side of engine

I am now dealing with lower engine block small cracks
Separate post
Thanks again
Marin M5
(thanks Mike)
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post #5 of 24 Old 4th November 2011, 04:16 AM
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In this stage (engine apart) and concidering that your engine used quitte a lot of oil, I would remove the pistons as well to inspect the following

1: Condition of oil-scraping ring and compression ring
2: Honing pattern on cylinder wall
3: Clearance between cylinders and pistons

Your block appears to be in fine condition and if item #3 (clearance) measures less then 0,10mm, I would just replace the piston rings, have the block mildly honed and replace the bearings. With more then 0,10mm, I would use oversized pistons (93,55mm) and have the block bored to 93,60mm. This resets the clearance to the factory-spec 0,05mm

For more information and background; refer to the engine rebuild of my E28 M5

Raymond

==> MY90 E34 M5 3.6 <==
==> MY85 E28 M5 M88/3 <==

The E34 M5 Alps tour. Sixth edition: 14-17 September 2007

Last edited by raymondw; 4th November 2011 at 04:17 AM.
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post #6 of 24 Old 4th November 2011, 04:42 AM Thread Starter
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91 M5 Engine Comments

Raymond
Thank you very much for your comments.
It was just the type of technical response I was looking for from someone with experience going this far.

Before I make my final decision on the block, take a look at my pictures I just sent today in a separate thread regarding my engine block in thread called "Lower block cracks"

Would you comment about the condition of the block or any of your recommendations change after your view of those few pictures?

As you already no doubt know, you provide a great service to us out there keeping the S38 E28/E34 M5 engines going forever.
Thanks again
Marin M5
(bob)
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post #7 of 24 Old 4th November 2011, 04:47 AM
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Hi Bob,

I have just seen them and posted comments in that thread. Blunt said => the engine block is beyond repair.

Raymond

==> MY90 E34 M5 3.6 <==
==> MY85 E28 M5 M88/3 <==

The E34 M5 Alps tour. Sixth edition: 14-17 September 2007
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post #8 of 24 Old 4th November 2011, 06:38 AM
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Bob, can you still get a "block and pistons" from bmw? I've got a friend in the dealer network and i'll have him check for you.

Mike

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post #9 of 24 Old 4th November 2011, 09:11 PM Thread Starter
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Sourcing E34M5 blocks

MIke
Raymond

Thanks very much for your comments.
Hopefully there is a block out there some where.
My service rep at Dinan says BMW does NOT have any left, remanufactured or not.

Mike, could you call your dealer source or send me PM re his name, since our info is that BMW has nothing. BMW price is no concern since it appears a dealer over-torquered my heads on a warranty repair earlier in this engine's life.

Raymond
Do you have any aftermarket sources?

thanks
Both of you
Marin M5
(bob)

Any one else out there in M5board land have any sources for E34M5 block with piston set?
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post #10 of 24 Old 4th November 2011, 10:33 PM
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I spoke to my friend today, as dinan said, there are no more 3.6L engines. No short blocks, no block and piston sets. It is not listed as "NLA" (no longer available), but there are zero in the US, zero in Germany, and zero in production. He thinks this may mean that eventually there may be some remanufactured engines available, but nothing in the foreseeable future.

However, there are 6 3.8L block and piston sets available in Germany! (actually that may have been complete 'short engine', i.e. bottom end) You'd need a 'legally' imported 3.8 M5's vin for him to order that, otherwise he is blocked from ordering those parts. You may ask dinan is that is a possibility, 3.8 block with the 3.6 top end? If so i may know of a guy.... (if all else falls thru with a good 3.6 block).

Mike

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94 M5 Touring Madeira Schwarz, Black 10/93 production
88 M5 Black/Natur (US spec)
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00 528i, sport Biarritz Blue, Sand
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Last edited by mottati; 4th November 2011 at 10:34 PM.
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