760 GLE Exhaust problem

LJB · Nov 28th, 2007, 23:31

I have a 1989 760 GLE saloon, recently the exhaust has started to blow on a manifold joint, well I think it is one of the manifold joints, it is really hard to tell. There is no sign of any soot around the joints and when the engine has warmed up the noise almost disappears. The exhaust system is not very old and all the other joints are fine. Could it be one of the manifolds/ manifold gaskets? Has any one come across this problem before?
LJB

CTCNetwork · Nov 28th, 2007, 23:49

Hi,

Yes the manifold gaskets on my 940 started going south so changed them..

The problem is more noticeable when the engine is cold as expansion of materials seals the gaps.
The problem changing them is that the manifold is held in place by bolts on pins screwed into the block.
These rust into place like nobodys business so liberal application of an anti-locking solution is recommended (overnight at least). Not WD-40 but ... Damn, forgot the name of the stuff...
Also, even then they may shear so be prepaired!
Get new ones to replace when getting new gaskets..

Des. . .

LJB · Nov 28th, 2007, 23:55

Hi Des, many thanks for that, I thought it might be the manifolds,
Regards
LJB

Jim760 · Nov 28th, 2007, 23:58

my 760 hasn't got exaust gaskets on the downpipe at least. the downpipe is just a pressure fit to the manifold, 2 bolts hold it tight on both banks, its a bugger to line up perfect (mines blowing because of it) space is a nightmare but if your sure its the down pipe, beware its one pipe for both sides! replacing it is not a job for a diy unless you can get the car up high enough (or you take the gearbox off!) undo the downpipe from both sides and smear exaust sealer round the flanges and refit. that should do it. but if the pipe is rusty yove got some work ahead!

niloc · Nov 29th, 2007, 00:47

Jim, the gaskets referred to are manifold-to-head...

hawaiianblue · Nov 29th, 2007, 17:07

Quote:

Originally Posted by CTCNetwork

Hi,

Yes the manifold gaskets on my 940 started going south so changed them..

The problem is more noticeable when the engine is cold as expansion of materials seals the gaps.
The problem changing them is that the manifold is held in place by bolts on pins screwed into the block.
These rust into place like nobodys business so liberal application of an anti-locking solution is recommended (overnight at least). Not WD-40 but ... Damn, forgot the name of the stuff...
Also, even then they may shear so be prepaired!
Get new ones to replace when getting new gaskets..

Des. . .

plus-gas

CTCNetwork · Dec 1st, 2007, 02:05

Hi,

Quote:

Originally Posted by hawaiianblue

plus-gas

Yep, that's the stuff.. Thanks...

Des. . .

JIM C · Dec 1st, 2007, 02:55

Plus gas.

Nov 28th, 2007, 23:31	#1
LJB New Member Last Online: Dec 6th, 2007 22:06 Join Date: Nov 2007 Location: Derby	760 GLE Exhaust problem I have a 1989 760 GLE saloon, recently the exhaust has started to blow on a manifold joint, well I think it is one of the manifold joints, it is really hard to tell. There is no sign of any soot around the joints and when the engine has warmed up the noise almost disappears. The exhaust system is not very old and all the other joints are fine. Could it be one of the manifolds/ manifold gaskets? Has any one come across this problem before? LJB

Nov 28th, 2007, 23:49	#2
CTCNetwork Forum Support Team Join Date: Dec 2004 Location: Liège, Belgium View Photos By: CTCNetwork	Hi, Yes the manifold gaskets on my 940 started going south so changed them.. The problem is more noticeable when the engine is cold as expansion of materials seals the gaps. The problem changing them is that the manifold is held in place by bolts on pins screwed into the block. These rust into place like nobodys business so liberal application of an anti-locking solution is recommended (overnight at least). Not WD-40 but ... Damn, forgot the name of the stuff... Also, even then they may shear so be prepaired! Get new ones to replace when getting new gaskets.. Des. . . __________________ Density:- Not just a measurement ~ It's a whole way of Life.! ! ! I drive a Volvo, Please Don't Get In My Way! OldVolvos4Ever He shows up. People die. He vanishes. People should not be afraid of their governments. "He'll deliver more justice in a weekend than 10 years of your Governments should be afraid of their people... "V" courts & tribunals. Just stay out of his way." "I plan to."

Nov 28th, 2007, 23:58	#4
Jim760 Mr G Last Online: Jun 12th, 2020 19:11 Join Date: May 2007 Location: north yorkshire	my 760 hasn't got exaust gaskets on the downpipe at least. the downpipe is just a pressure fit to the manifold, 2 bolts hold it tight on both banks, its a bugger to line up perfect (mines blowing because of it) space is a nightmare but if your sure its the down pipe, beware its one pipe for both sides! replacing it is not a job for a diy unless you can get the car up high enough (or you take the gearbox off!) undo the downpipe from both sides and smear exaust sealer round the flanges and refit. that should do it. but if the pipe is rusty yove got some work ahead! __________________ will the jimousine ride again? previous models 940 TDI360 GLT 480 ES 740 GLE 940 SE 760 Executive 940 GL 850 GL 760 TIC V70 Torslanda

Nov 29th, 2007, 00:47	#5
niloc SWV Benefactor Last Online: Jan 30th, 2013 13:44 Join Date: Dec 2001 Location: Newport, South Wales	Jim, the gaskets referred to are manifold-to-head... __________________ Refitting is the reverse of removal???.....Yeah, right!

Dec 1st, 2007, 02:55	#8
JIM C Forum Support Team Last Online: Jul 4th, 2021 16:28 Join Date: Dec 2003 Location: Scotland View Photos By: JIM C	Plus gas. __________________

Nov 28th, 2007, 23:55	#3
LJB New Member Last Online: Dec 6th, 2007 22:06 Join Date: Nov 2007 Location: Derby	Hi Des, many thanks for that, I thought it might be the manifolds, Regards LJB

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