SOHC.co.uk Forums > CB750
Rockerbox Gasket
Bitsa (Ralph Wright - RIP):
Hi Guys,
All your experiences wanted.I have a tiny dribble of oil leaking out between pots 2 and 3.When I rebuilt it I used all genuine gaskets and have never had leaks must be lucky but I have only ever had leaks using pattern ones.I stripped it down again checked all the bolt holes for leaks as I know PO helicoiled 1 cam cap bolt and drilled too far and came out in the cavity above the spark plug which dribbled last time.All seems fine the pucks are dry but the only oil I could see was from the rocker gasket.It was not soaking wet but looked like the same as the head gaskets used to weep.I do have another Honda one but before I fit it what I am asking for is has anybody goo ed it before?I have never had to before but I do not want to do this again.On the pics it is just behind the front 6mm head bolt.On the head the oil settled on the fin level with the exhaust flange screws.
Thanks
Bitsa
Bryanj:
Might seem a silly question but are you sure the gasket was the correct way round as it will fit the wrong way and leave a small hole for oil to leak through
Bitsa (Ralph Wright - RIP):
Bryan.
Cheers for that but on one of the photos it shows the gasket in place what I can not work out is its only wet on the outside not the camshaft side weird.Also what is special about the cam cap bolts that seem to strip their threads easy.Being an Ali head you would think that they would strip first.Can I use ordinary 6mm bolts at the right length as I can not find in cabbage ville Allen bolts long enough, some original are not available now?
Cheers
Bitsa
K2-K6:
For the gaskets on these engines I've always used Blue Hylomar.....I know others don't agree so they'll have to offer their own view.
I just use the smallest amount possible to apply the most sparing film to the gasket itself and let it dry....then clean the metal surfaces with a degreasant before assembly.
My feeling is that the bolts all around the head are torque limited ( i.e. you can't risk just doing them up any tighter for risk of stripping) and even if you could do that then the gaps between the bolts seem big enough that you may even cause local distortion that just achieved higher clamping around the bolt location and not the other areas.
If you want some allen bolts from the uk I could certainly look for some for you and post over...there is a very old fastener supplier I've used for years that I could try for you but would need a spec to check availability...it wouldn't be the quickest process but the offer's there if you want.
Nigel.
UK Pete:
Like Nigel says blue hylomar is the way to go, i done my f2 two years ago and used hylomar on every gasket it is leak free on all gaskets, but you have to go easy with it, use the spray if you can get it, that is what i used
Pete
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