SOHC.co.uk Forums > CB750
CB750 K3 Oil leak
sim2011:
Nightmare !
Just finished my restoration, started engine again for the second time only to notice oil oozing out of the LH side head gasket joint, I cant believe it , it had new gaskets and new O rings the correct Honda ones and a pattern head gasket from Dave Silver.
so its engine out again GRR , no doubt on strip down I will find where its leaking , I'll probably get the barrels and head skimmed to be sure , this time round I've opted for the genuine Honda head gasket at
UK Pete:
Hi si , i have had this problem on a kawasaki 550 i was so dissapointed but at least i could strip the top end in situ, where as with the honda it is an engine out job, am am currently building two 750 SOHC engines and i am really worried this could happen to me, most people you talk too say just use honda gaskets and put them in dry, a few people grease the gaskets, and in some cases a thin smear of blue hylomar just help it seal, i used blue hylomar on one of my gpz's and it was fine but i am in two minds wether to use it on my honda engines, they do a hylomar spray on gasket dressing , that seems to be the perfect choice a thinly sprayed non setting gasket dressing, or copper gasket spray
Pete
Bryanj:
Are you sure its from the gasket itself and not running down from either one of the seals under the cam bearings or from a stud hold holding same? the studs need good threads and sealing compound to stop leaks and the seals need a sealant around the edge
Spitfire:
Never had one leak, but I only ever use genuine Honda head gaskets, the rest of the gaskets I use tend to be pattern but not on the head.
Cheers
Den
sim2011:
Hi Everyone
Thanks
I did set the seals under the cam bearings in non setting sealant and caulked the edges the disc seals were new genuine Honda.
The Oil is definetly coming out of the head gasket.
Just waiting for a helping hand to lift it out and then I will report my findings
Si
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