Need new M5 E39 motor? Or replace valves? - The Unofficial BMW M5 Messageboard (m5board.com)

M5Eddie · 21st January 2008, 19:53

Hello everyone, my M5 has gone down.

My mechanic says that I need a new timing belt hydralic tensioner, and he says its a big job to replace. He says that maybe the best thing is to buy a new engine because there is a possiblity that the valves are bent.

Did this ever happened to anyone.

I have a 2000 M5 with 125k on it.

Thanks for the response.

Yaninnya · 21st January 2008, 20:29

It looks like you shoud change the... mechanic as in S62 engine there is no timing belt. There is timing chain.
How he know that it snaped?
Jan

6spd · 21st January 2008, 21:20

Find a new mechanic, its a double row chain.
Plus the tensioner is on the front chain cover, see #20.

http://www.realoem.com/bmw/showparts...60&hg=11&fg=25

Is the engine broken? rattling?
There was a topic just a few weeks ago about the tensioner, I don't remember the outcome.

M5Eddie · 21st January 2008, 23:34

Im sorry, he says the chain.

I was just driving and made a stop at the mall and the car just turned off, i tried to turn it on again and it started then it just turned off. After the 4th attempt, the engine made a rattling sound, so I turned it off quickly.

When the car was towed to the mechanic, the car did not start at all, just kept trying to start. No rattling noise after that. So I do not want to start the car at all until I find out what is the problem. When I opened the oil cover, the chain seems to be nice and tight, but what do i know.

Right now, the mechanic is charging me 46 hours to change the tension for the timing chain. I think thats too much. So, right now, Im not sure what to do. I dont want to go to the stealer, but Im looking for another mechanic in the Orlando, Florida area.

Thanks.

Ladykats · 22nd January 2008, 00:17

Check IATN.net for mechanics in your area.

THRILOS5 · 22nd January 2008, 02:21

if your mechanic is charging you 46 hours labor then I would rather take it to the dealer
I think Fields BMW is in the Orlando area

Lohe · 22nd January 2008, 03:31

Geez this guy is jerking you around. 46 hours :rofl the dealer at this point will cost you less.

And timing chains can break but it is VERY rare. and a doubt it your problem.

mottati · 22nd January 2008, 07:41

but if the timing chain actually failed and the chain skipped a few teeth, you may have bent valves. More diagnostic work is needed. Easy to check valve timing by pulling off the cam covers. Then compression or a leakdown test to see if the valves are sealing or not. If ok, new chain and tensioner, if not, pull the heads and replace the valves. It's understandable to be hesitant on doing a top end overhaul on a 125k motor.

ard · 22nd January 2008, 08:56

Quote:

Originally Posted by Lohe

Geez this guy is jerking you around. 46 hours :rofl the dealer at this point will cost you less.

.

+1

You call the dealer a 'stealer' but 46 hours is OK for changing a tensioner?? Yikes.

You need a new mechanic. FInd some senior members on this board in your area and ask for recommendations via PM.

Ledfoot · 22nd January 2008, 11:17

It started a total of four times after the initial symptoms, then not again...doesn't sound like a timing chain break to me. If that was the case, I'd think that the car wouldn't start at all.

derheilige82 · 22nd January 2008, 20:24

Ask him if the flux capacitor also needs to be changed...

broken chain will not start the car...unless the chain was on its way out the first four times and eventually it broke and hence your car not starting.

get another opinion but try not to mention what this mechanic said or speculate on the issue to the new mechanic.