Paul-
While there are no illustrations of an exhaust manifold gasket in the MGB GT V8
Workshop Manual Supplement, I can't believe that these engines were built (by
the factory) without them. It is almost impossible to get a seal between a cast
iron block & cast iron exhaust manifolds because of the different rates of
expansion, and at least 4 times as hard when one part is aluminum.
I have a 1980 Rover Workshop Manual, 2300, 2600, 3500, & a Rover 3500NAS Parts
Catalogue, also 1980. The manual goes into great detail about removing &
replacing the exhaust manifolds, but is silent about gaskets except within the
exhaust system itself, Same for the 6 cylinder engines. The parts catalogue,
however, clearly shows manifold to block gaskets with a part number, & a
notation that they are part of a manifold set with a part number.
My own opinion is that there were always gaskets, that it was so obvious that
it was not mentioned. There were certainly gaskets in the 1980 versions, as I
have removed them when discarding the 3500 iron manifolds.
I further believe that 13 lbs. is safe with a gasket. My own practice has been
to snug the bolts enough to compress the lock washers, run the engine a few
minutes, let it cool, then retighten the nuts until the washers compressed.
Jim Stuart
"KILE, PAUL D" wrote:
> Hi guys,
> I'm getting ready to bolt the exhaust manifolds onto my 3.5 for my factory
> MGB-GT V-8. The factory recommends 13 foot-pounds for the bolt torque, but
> that is for the original specification without manifold gaskets (the cast
> iron manifolds bolt right up to the aluminum ports). I am retrofitting the
> manifold gaskets, as recommended in an MG V-8 Workshop Note from the MGCC.
>
> Does anyone know if a US-spec Land Rover or Range Rover which uses the
> exhaust manifold gaskets takes a different torque on the bolts? I don't
> have any Rover workshop manuals, only the original MGB-GT V-8 supplement.
>
> Thanks in advance,
> Paul Kile
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