I have changed the manifold gastket before.
I would recomend that you buy yourfelf some GM SEALER {avaliable from Repco}
it's great stuff for gasket sealing on these engines and drys hard.
Simon
----- Original Message -----
From: Stuart Goggin <SGOGGIN@au.oracle.com>
To: <buick-rover-v8@autox.team.net>
Cc: <SGOGGIN@au.oracle.com>
Sent: Thursday, July 08, 1999 3:11 PM
Subject: Help with vaccuum leaks on rover v8
> Hello All.
>
>
> Sorry if this is a little off topic for this list, I really just want some
> feedback from some rover v8 experts...
>
> Looks like I have to replace the inlet manifold gasket on my 84 RR. I am
> getting some severe flat spots about mid throttle when the engine is cold.
> I can fix the problem by warming the engine up and then switching it off
for
> ten minutes. As the manifold warms up the flat spots dissappear. But it
> only takes a few minutes of driving for the problem to reappear as the
> manifold cools. The RR has a 3.5 v8 with twin strombergs, I have checked
> the carby diaphrams and they looked OK.
>
> I took it to a local RR specialist who diagnosed an inlet manifold leak
and
> an electronic ignition module failure. Apparently they took it for a
test
> drive and then swapped ignition modules, the problem disappeared. So
they
> concluded that the electronic ignition was faulty. They wanted $300 AUD
> for an used ignition module. Did some ringing around and found that
> Rangie Spares in Melbourne had the modules NEW for $75. Ordered it and it
> arrived the next day. Took all of ten minutes to fit and find out the
> problem did not change. Finally realised that the heat soak from their
> first test drive had fixed the problem temporarily, and that switching the
> modules did not. Luckily I did not spend the $300 they wanted on their
> second hand module.....
>
> So now I am going to look at the inlet manifold leaks. I find it a little
> hard to believe that a small vacuum leak can cause such major performance
> problems. Every car I have owned previously would run OK with leaks
large
> enough to hear the hiss. So is it really possible that what must be a
> fairly small leak can cause big flat spots?
>
> I have also noticed that the PO has removed the third crankcase input
> breather filter, and replaced it with a screw. This means that the
crancase
> is always running with a high vacuum. I guess this might have sucked the
> inlet manifold gasket in and caused an air leak...
>
> I will be replacing the gasket myself, mainly because I want to learn how
> to do it, but also because I can't afford to spend the $250 they want for
replacing
> the $20 gasket.
>
> Any comments/hints/flames welcome....
> Regards
> Stuart
>
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