Yanmar 1GM10 head rebuld

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Mel

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Anybody know if it is correct to put a sealant on a new cylinder head gasket. The manual refers to "Three Bond 50", but this doesn't seem to exist. I have noted from a web search that some new gasket manufacturers place a sealing compound on at the manufacturing stage.

Clarification would be really helpfull.
 
My experience-

Hi-
sorry you need to spanner the lump!

My Yanmar YSM needed a skim and new gasket in August.

It's an older, horizontal, single than yours but not dissimilar.

Bryco Group Ltd - Daimler Close - Daventry - NN11 8QJ - Tel. 01327 876166 (no connection) posted out the gasket, not cheap but they took the trouble to double check some ambiguous part nos without asking.

As an ex garage owner I've never used compound so continue not to, if I'd started using it routinely, I'd probably say it was essential!

It went in 'dry' after wet and drying the block face and has done many hours since.

Hope this helps-

Nick
 
I replaced my 1GM10 head without using any sealant about 7 years ago no problem at all with it since, just torqued it up to required torque as per work shop manual.
pete
 
Mel said:
Anybody know if it is correct to put a sealant on a new cylinder head gasket. The manual refers to "Three Bond 50", but this doesn't seem to exist. I have noted from a web search that some new gasket manufacturers place a sealing compound on at the manufacturing stage.

Clarification would be really helpfull.
Click to expand...

I am just about to whip the head off my 1GM10 to give the exhaust gases an escape route (see other post). It's radical, I know, but it just might work.

I've always taken the view that sealant of any sort of head gaskets is an Abomination Unto The Lord, to be avoided at all costs, though for copper gaskets I do tend to use a very, very thin smear of copper grease.
 
ump010 said:
I did the head on my 2GM20 earlier this year. Used Hylomar ( best gasket goo ever). Have a look at their website, it specifically mentions using Hylomar on head gaskets.
Click to expand...

It's brilliant stuff, as long as you never want to take the head or gasket off again. By the time it's baked on for a while it's an absolute nightmare to separate the join.

In general I tend to the view that if the head, the block and the gasket are in good nick, so sealant is necessary, and that if sealant is necessary it's better to find and sort whatever's wrong with the head, the block or the gasket ...
 
Mel
I'm "old school" and over the years I've re-built more engines than I care to remember or admit and as an "old school" person I was always told NEVER put any sealer under a head gasket.
What you must do is make sure the cylinder head and block are flat, clean and free of grease and oil.
Then make sure you tighten the head bolts down in the correct order to the correct torque settings.

Like I said I'm "old school" and new thinking or members of this forum may have a different opinion.

Peter
The Boatman
 
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