> Seems
> like they both want to blow up manifold gaskets. What am I
> doing wrong?
Here are some general tips that might help:
Make sure all surfaces are flat to within a .001" or so. I like to lightly
rub a flat file on them, as it will pick up any high spots (and it's
surprising how often I find one). A carpenter's straight edge (or level)
will do for checking longer distances.
Check that the nuts spin easily all the way down the threaded portion of the
stud. If they bind partway down the threads, that stud is damaged and
should be replaced. New lockwashers, every time.
Make sure the intake manifold fits over the locating dowels. A trial fit
without the gaskets might be a good idea, to check that both manifolds can
fit against the head. (On the TRactor motor, the exhaust manifold sometimes
fouls on the engine block, but that probably wouldn't apply to the 6-pot.)
I don't recall offhand if the 6 cylinder engines have the manifolds bolted
together as the 4-bangers do, but if so I would suggest removing those
bolts.
Make sure the bridge pieces are in the proper places, and turned the way
they belong. On the outermost studs without a bridge piece, I find it helps
to use a heavy flat washer (sometimes known as a setup washer) between the
lockwasher and manifold.
Recheck all the manifold nuts after the engine has been run and allowed to
cool a few times, plus at every tune-up.
HTH
Randall
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