Head gasket sealing?

[onethumb]

Right my new OE head gasket has arrived so I'll be fitting it sometime this week ( got to get some oil seal metal tubes). Due to the last one being slightly out I want to cover all bases as it's costing me more than I can really afford now.
I've spoke to several different people and want to know what people here think about using copper slip or blue hyolmar or nothing. Ideas ?


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[hairygit]

DRY, and totally clean mating faces, OE head gaskets have a sealant sandwiched inside, which squeezes out as the head is torqued, making it an excellent seal.

[Skoti]

I've never used sealer whatsoever anywhere with OE gaskets on Honda motorcycle engines.

Make sure mating surfaces are spotlessly clean and dry and also oil free and your good to go.

Have fun!

Skoti.

[yozzer74]

Just built mine back up today didn't use anything on it also didn't use any sealer on rubber pucks .as recommended by a few people

[onethumb]

Yozzer did you put the 4 knock pins back in with the doughnut seals. Glad it's back together. Nice one.


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[yozzer74]

Yes I did

[onethumb]

Glad I ordered a replacement now.


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[MrDavo]

No sealant used or needed on mine, but I did put a touch around the rubber pucks for peace of mind, and because Mark Paris said so, it was leaking from there before it came apart. All dry now.

[Spitfire]

I've never used any sealant on a 750 engine but I've always used genuine gaskets and made sure that the mating surfaces were super clean.

Cheers

Dennis

[onethumb]

Thanks. 
I'm thinking weather or not to do the piston part while I've got it stripped. It was OK and dry before so thought it would be ok but I've read that people are doing this at the same time as the head because of movement. Any thoughts?


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[Bryanj]

In business we would never do just a head gasket always base as well to guarantee good sealing, when you have to remove the engine to do anything and the cost of the head gasket as well it was a no brainer to us

[Mag1]

Have seen people using some bond to glue the gasket, why I don't know as this can squeeze into the engine and cause blockages. As others have stated, clean and gasket only needed.

[onethumb]

Thanks. Info always appreciated.


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[philward]

The using of extra sealant comes from 'Hondaman' on the sohc.net site. It covers the earlier heads/barrels that didn't use the extra dowels/seals. It recommends thicker o rings and sealant in certain area's. I haven't got the .net forum links but kept an extract for future reference - see below.

Extract from sohc.net Hondaman post
'The OEM ones were Buna N (durometer 65-75). Those are real common. Make sure the size is 2.5 x 12mm, not the undersized ones found in some gasket kits lately. I just bought some 2.5x12 in both Buna and Viton, if you can't find any there.'

Not giving an opinion on the need for sealant but just quoting where the use of sealant may have come from - although I used the larger o ring as above on my K2 and its leak/mist free

Phil

[Greebo]

according the sohc specialist that built /restored my bike says using any kind of sealant is a definite No !!

One guy who took no notice of Steves advice insisted it was used on his rebuild & learned the hard way when the top end seized & he needed a new Cam, apparently a micro amount of sealant found its way & blocked the oil feed to the top end.
Obviously a new gasket is needed when rebuilding [no sealant] & the oversized O-Rings is the only way to go.

PS... I know I have got this story correct