Separating head and cylinder

For all that relates to both Armstrong MT 500 and Harley Davidson MT 350
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Re: Separating head and cylinder

Post by Wirralman » Thu May 07, 2020 6:35 am

This thread should really be in the Technical section / Problems/ Engine

You could well find discussion there. The Search facility may help

There may be differences between 350 and 500 engines, so useful to clarify
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Re: Separating head and cylinder

Post by MTBrown » Thu May 07, 2020 7:36 am

The parts catalogue shows no head gasket but the MT350 Repair manual I have indicates there is one which is all very strange. It's the only engine I've every come across that doesn't seem to use a head gasket but it's not clear how they manage to get away with this. The MT500 does have one even though it is essentially the same engine.
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Re: Separating head and cylinder

Post by nige » Thu May 07, 2020 9:37 am

I assume we are talking MT 350 here. So indeed no head gasket, metal to metal faces and no sealant of any kind. Don’t forget to replace the o rings with the correct genuine type. In my experience these can weep more than the actual gas head joint. But as said before do read the tutorials. They are well written and easy to understand.
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Re: Separating head and cylinder

Post by ZIP TIE » Thu May 07, 2020 3:06 pm

Mt500 iron bore fitted to aluminium head = head gasket needed.
Mt350 aluminium bore (nicasil coated) fitted to aluminium head = no head gasket needed.
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John Breay
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Re: Separating head and cylinder

Post by John Breay » Fri May 22, 2020 3:11 pm

All back together, timed up and running well. Took the opportunity to ditch the airbox and fit a K&N cone type filter as i was the carb to engine boot a total pain in the backside.

Thanks for all your input folks.
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