high pitch noise from engine and solution

[Patrick]

My M20B28 started making loud high pitch noise. The pitch changed with RPM and seem to reduce under load. I thought it might be a loose belt or a shot bearing. Noise was located near the back of the engine.

After a an hour or so of poking around today it turned out the intake manifold gasket was leaking on cylinder 6.

Just thought I'd post should anyone else have a similar issue

I'm pretty sure it must have been a materials failure as I've not put that manu miles on since the rebuild. Need to order new gaskets, going to do all of them to be sure. Some non-setting gasket sealer has shut it up as a temporary solution

[Patrick]

Fixed this at the weekend, new set of gaskets and tappet adjustment has made the engine run nice a smooth (well smooth for a hairy cam).

The old gaskets had seperated into layers and starts gettng sucked into the engine on cylinder 1 and 6.