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Discussion Starter #1
Hi, I have just had the dual mass flywheel replaced on my peugeot 307sw 2ltr hdi 110bhp 2003. When the engine restarted we noticed a bad oil leak dripping from bottom of engine. My mechanic said he reused the old flywheel bolts but only fitted 7 of the 8 flywheel bolts as one was missing.
Could this be the cause of the leak ? if so why ? I have ordered new bolts from peugeot and plan is to replace all the bolts.
Im not even sure if the oil is engine oil or gearbox oil.
 
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No it wouldn't. They don't contact with oil. Somehing else is damaged.
What colour is the oil?

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Discussion Starter #3
The oil is dark black but looks quite thin. Im now convinced it must be the driveshaft oil seals you warned me about. I will try to find 2 of these seals tomorrow. Im guessing it would only be peugeot who would have these?
My burning question is do you think the flywheel will be fine with just 7 of the 8 bolts fitted ?
The mechanic said there were only 7 bolts in place when he took it apart.
If we can avoid starting from scratch it would save lot of work. What do you reckon ?
 
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Theres nothing that can be guaranteed. There are 8 of them on there for a reason afterall.

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I don't think it would cause imbalance, the mass of a bolt, very close to the to the centre line should not make any problems, I also think you would get away with seven bolts, but if it does let go you will be looking for a new engine and box, it's up to you.
Also I would not use anyone that would rebuild a clutch with a bolt missing,
Cheers John
 

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You need all the bolts in the flywheel. Imagine the stress on the others with one missing. Change mechanic, he sounds like a cowboy
 

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Change all the flywheel bolts and torque them to the required setting and use a little lock tight on each new bolt. A missing flywheel bolt will throw the engine off balance at certain revs. Imagine it like the drive wheels of your car have not been balanced after a tyre change, the steering wheel will vibrate at certain speeds and as you slow down/speed up it stops. The flywheel will do the same and if its held at the point of imbalance for a long period of time say on a motorway then the damage could be really bad. Like others said on here you could be looking at a new engine/gearbox. Also I advise you not to use that mechanic again as it sounds like he should be walking around Kwik fit with exhaust specialist written on his overalls!


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Sorry and the oil leak, is it coming from the bell housing? If it is then that will be the crankshaft oil seal and the reason it leaking would probably be because of the imbalance on the crank. Oh and I don't think that there would of only of been 7 bolts in the flywheel when they removed the gearbox. I think they maybe lose one and could not be bothered to find another. Gearbox oil is usually either clear or red in colour unless its a really unhealthy gearbox. The colour you described sounds like engine oil. :)


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Discussion Starter #11
hi all thanks for your replies. I didnt get notifications through my email as to your new posts on this thread Im so only reading them now. I did buy the driveshaft seals and a new set of bolts and gave them to him yesterday.The mechanic was re=fitting these yesterday afternoon and today. Im about to go and see how he is getting on. My big fear now after reading posts that the crankshaft oil seal may be the problem and he will have done the job without replacing that. If that is the case is it something I can live with by regularly topping up the oil or will I definitely need to get it seen to and get whole lot taken apart for third time :mad: ?
 

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Hey guys.

The holes in the crankshaft where the flywheel bolts to the crank are completely through the crank at least on the XU/DW engines, and as this is a 2 litre it will be of this engine family.

If you fail to insert one flywheel bolt, oil can, and probably will get through.

Of course it can be the oil seal too, but as the missing bolt leaves an open hole into the crank area where oil splashes around, it certainly is likely to be the cause of the leak.

It might cause a small imbalance too, but it is so close to the crank centerline, so that will probably not be noticeable.
 

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Discussion Starter #13
b1ack ...Im loving your answer and praying its correct. I called in to see him and although he has already done most of the job he did say the crankshaft was not leaking. Hopefully it was just the missing bolt allowing the oil to get through.
I'll let you know how I get on.
 

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Discussion Starter #14
Ok I have got the car back,took it for a drive and its all looking very promising. No obvious leaks and everything is working. He said the oil was definitely coming through the missing bolt hole and possibly also seeping through old bolts. Its been a bit of an expensive lesson for me but at least it may helps someone avoid falling into same trap. If fitting new flywheel in this engine you must use NEW BOLTS and must make sure you fit all 8 of them.
:thumb:
 

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It is not. Look here XU crank (but DW is the same), holes straight through. Oil from main bearing will get straight through.



I actually know a fair bit about this engine family. Tuned and overhauled quite some of them, and got 7 blocks in pieces in the garage :)

BTW: You don't need to use new bolts, but I usually clean/degrease the threads properly, and put threadlock/locktite on them, that will seal it and avoid it leaking oil anyways.
 

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theres no way my mechanic would have fitted it with a bolt missing

i hope he gave you some money off. i would have been told and if needed asked to source relevent parts
 

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Discussion Starter #19
No he held his hands up yesterday and admitted he should not have only fitted 7 bolts in first place. We all make mistakes. He is a friend and was doing it at low cost so I actually gave him bit extra for the hassle of doing it twice.
To be fair though out of all the replies to this post it was only B1ack who knew for sure that the missing bolt would leak oil. I suppose at end of the day he shouldnt have been cutting corners anyway as the bolts are there for a reason.
I have however just come back from a drive and on way home an ANTI POLLUTION FAULT message appeared on dash along with engine light.
Is there anything that could have been dislodged during flywheel procedure that could cause this ?
Im fearing the worst :confused:
 

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You're quite right to point out that only one person correctly identified the fault. I've only just read these posts but I had a similar experience with a golf. I was quite surprised to see that the flange that the flywheel sat on had holes drilled right through to the cranckcase just as your peugeot. Apart from the oil being able to enter through the hole I'm quite sure no harm would have come from having only seven bolts. Talk of it unbalancing the flywheel is wide of the mark, and would expect that the built in safety margin would probably allow it to work with only six! Having said all that it's always best to do things properly, it's just that sometimes we're forced to compromise.
 
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