SOHC.co.uk Forums > CB750
Head gasket sealing?
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
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