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head shims on .18TM

Old 06-06-2007, 03:39 PM
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Default head shims on .18TM

I reciently bought a .18TM used and have just gotten it running. I had one of the glow plug wires came apart in the middle and was luckely held in by the bottom of the wire so it did not drop into the engine. I pulled the cooling head and noticed that the engine does not have a shim on the head button and was wondering what the stock thickness is on that and what possible engine damage could have resulted form not running this shim.

Thank you,
Matt Brown
Old 06-07-2007, 09:33 AM
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Default RE: head shims on .18TM

Your O.S. Max engine most certainly does have a cylinder head gasket. Look closely. It's made of the same-colored aluminum as the rest of the cylinder head. It fits very closely and can be hard to see unless you can get a very close-up look. You will need the very sharp point of a #11 blade to lift it off.

That said, you can always add a stock cylinder head gasket to reduce compression if you're getting detonation when the engine's running at full throttle and is also rich of peak RPM. Even so, if you're running a very low-oil fuel, you could still get the difficulty, even if the engine's not detonating.

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