SOHC.co.uk Forums > CB750

Cylinder Head Cover Leak

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Bryanj:
The person to ask here is Trigger, try a pm he is usualy about if not on holiday with Julie

Martin6:

--- Quote from: Pauarc on October 10, 2023, 09:18:10 PM ---Hi Martin
I had a similar issue with a cb550 I managed to get the gasket face skimmed and put two gaskets there maybe it will be possible for you
Paul

--- End quote ---
Hi Paul,

It crossed my mind, but I thought I might not get a seal across two gaskets. Good to know it could work. It may be a little deep for a skim, but if I can't find an alternative, that's what I'll try. Can you recommend anyone local to us?

Martin

Trigger:
Easy to fix if you have the correct tools and the skills. Alloy weld the damage area and mill it back to standard .

To skim this to top surface on a 750, you would have to remove all the valve guides and replace with new ones. It must be spot on as the tach drive needs to mess correctly with the drive teeth on the cam shaft  ;)

Martin6:
Putting a ruler edge across both the head and the cover, both are showing a fair bit of daylight. The cover is quite deep damage. The head is not so deep, but it's  over a wider area all around the screw hole. Whoever, did a good job on them!

Thanks for the advice. Good to know welding could do it. I don't weld, myself and the head has other issues: two sheared cover to head screws and a sheared exhaust flange stud. All were very rusty.   :-[

I've found a couple of potential replacements (ebay):
- The cover was fairly cheap, with good a gasket face. So I've bought it. Will need a good polish up.
- The head is more expensive, but the seller will accept a return if I'm not happy. The photos show decent gasket surfaces and it looks very clean. It comes with its valves still in. 

So, I'm thinking the route I will take is buy the head, check it is flat, check over and lap the valves it comes with and then build it up with my cam and rockers etc. I'm hoping the valve guides will be OK. Should I replace the valve stem seals?

Any reason this plan may not work? Anything I need to look out for?

Trigger:
The 750 sohc has many different heads. You must get the correct one  ;)

Everything needs to be measured up, valve guides, valves, seats inspected, re-seal the tower studs and you change the valve seals as standard. If you need a good rocker cover contact Julie as she has many in stock and will be cheaper  ;)

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