We have an M5 down.. Engine rebuild GA25331 - BMW M5 Forum and M6 Forums
E34 M5 Discussion 1988-1995 Sedan and Touring

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post #1 of 54 Old 29th January 2013, 11:09 AM Thread Starter
BlueBiturbo
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We have an M5 down.. Engine rebuild GA25331

I bought GA25331 in September... it was rebuilt in 2010 in official BMW dealer
White M5 from Jakarta

Found many small problems for a few months... now it is clear that this is not a small problem.

Tony (AseanAero) will elaborate

It is said that if you line up all the cars in the world end to end, someone would be stupid enough to try and pass them.

Last edited by BlueBiturbo; 29th January 2013 at 11:19 AM.
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post #2 of 54 Old 29th January 2013, 11:32 AM
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GA25331 has had a history of rough running since Taffy bought the M5 and here's what we've been through so far

1. Found intake temp sensor not connected, action : reconnected

2. Found K+N filter and lots of grit and GRAVEL in the intake box, action : replaced with a new OEM air filter

3. Dirty MAF , action : cleaned MAF and then replaced with a new MAF

4. Found sulphur like yellow deposits on plugs action : replaced plugs with new plugs

5. Valve shim clearances done generally shim clearances were good and we changed out 6 shims (compared to 17 on my engine)

6. ITBs balanced , these were out on 2 cyls

7. Checked compression, readings 1 to 6 were 180, 180, 180, 180, 180, 190 (an aircraft mechanic friend said these readings are WAY TOO CONSISTENT and suspected each of the cylinders had oil in them, we didn't do a dry and wet compression test at the time)

8. Replaced injectors with new injectors

Each change made good improvements (the big ones were the MAF , valve shims and injectors) and the engine runs smoothly and doesn't hunt at idle anymore but GA25331 has started to consume 1 litre of oil for 200kms so somethings not right.

A future M5 owner has joined our group (Glenn 21 yrs old and keen as hell) who has just completed his automotive engineering course in Australia and builds Nissans and other cars (Nissan GTR and other rice racers) for drifting

Glenn's further investigations found (and I'm reporting this remotely, Glenn will update later)

1. The cam cover wasn't square , 0.2mm from true

2. The head gasket showed some 'erosion'



3. Then looking further into the head gasket Glenn removed the head found that the cyl head studs around cyls 1, 5 and 6 (also the ones with the bad injectors we replaced) had lost tension due to thread damage

4. Valve guides worn

5. Reports that the oil pump drive sprocket is damaged / stripped (engine backfire at high speed ?) , waiting for photos, I can't picture in my mind what's happened here.

Speaking to my aircraft mechanic friend (who also used to build drag car engines) when he looked at a photo of the piston crown it appeared to him that cyls 1, 5 and 6 were running hot and the engine has detonated , backfired or done something nasty during a hard pull then sudden back off on the throttle. It's also possible GA25331 got a load of contaminated fuel (lower octane than advertised or cut with other chemicals)

We've decided to tap into the M5board and see what the M5 wizards (in blue coats) can come up with.

Taffy's decided to pull the engine and get Glenn to go right over it.

This all happened since a 220kmh run which Taffy did on his own a few months ago.

Other than high oil consumption the engine runs and idles smoothly and produces good power.

I'm doing this third person , the M5 is 150kms away at the moment.

Other photos




























Opinions welcomed.


.



Tony, Aussie expat in Jakarta Indonesia

1990 E34 M5 S38B36 GA25324
GA25324

Last edited by AseanAero; 30th January 2013 at 03:56 AM.
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post #3 of 54 Old 29th January 2013, 08:15 PM
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Take the engine out,,+ the gearbox and take it this way.. dead easy

and if this is a total build,, do it properly,, new gaskets.. check bearings etc etc

clean everything and so on



Sveinbjörn Hrafnsson

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post #4 of 54 Old 30th January 2013, 02:45 AM Thread Starter
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Quote:
Originally Posted by Ferrari-Bmw View Post
Take the engine out,,+ the gearbox and take it this way.. dead easy

and if this is a total build,, do it properly,, new gaskets.. check bearings etc etc

clean everything and so on


Will do...
Thanks

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post #5 of 54 Old 30th January 2013, 03:41 AM
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Keep the faith Taffy , this is all part of the process of getting your M5 'right' , undoing the effects of 20 years of bad maintenance or no maintenance.



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1990 E34 M5 S38B36 GA25324
GA25324
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post #6 of 54 Old 30th January 2013, 03:43 AM
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What does this 'DOT-R' sticker mean on the engine ?



Tony, Aussie expat in Jakarta Indonesia

1990 E34 M5 S38B36 GA25324
GA25324
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post #7 of 54 Old 30th January 2013, 08:26 AM
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post #8 of 54 Old 30th January 2013, 09:27 AM
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Sorry to hear this, Taffy, and good luck with the rebuild. Please research it very carefully (one random eg essential to clean out or replace oil cooler and lines) as it is a very major investment - and too many of them end in heartache. I think one essential aspect is to have a really good personal relationship with your builder (who must be proven to be competent and experienced) as that relationship may need to withstand some difficult conversations.

All the best.
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post #9 of 54 Old 30th January 2013, 09:35 AM Thread Starter
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I was planning to flush oil cooler and radiator when we were looking for the cause of oil leak.
Yes those are some of the things already on the list.
Thanks for the suggestion.

Cheers,
Taffy

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post #10 of 54 Old 30th January 2013, 06:19 PM
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