SOHC.co.uk Forums > CB750

cam shaft oil starvation

(1/4) > >>

bluemouse1006:
Hi

Well started my bike for the first time after about 2 months, Ive stripped the engine replaced all seals and gaskets etc, replaced inlet valves also after finding they were bent !!
I've looked on this forum and was paranoid about all sorts of stuff so after about 5 minutes of the engine running I removed the tappet adjust covers and looked inside,seems 1+2 cylinder has oil around the base of the valve springs,took 3+4 off and they are totally dry. May be me but I thought that because that the bike was on its side stand the oil might have gone to one side ???
But to be honest think that I may be fooling myself !!!!
I remember when fitting the cam carrier there was two oil ways coming from the centre head bolt which had o rings around them and another two oil ways in the head that didn't have holes in them but strangely still had O rings is that normal ?
Think I will have to take the engine out again (third time !!!!!!!!!!!!) and have a look at the oil ways to the cam shaft, anyone have any ideas/photos about what I should be looking for.

Although its dry on one side I do feel lucky that I haven't ridden it and snapped the camshaft and made even more work/cost for me..

would really love to hear your comments, I've got tomorrow off so will be stripping it again then if needed !!

Thanks

Amos  :o
 

Bryanj:
Did you remove and clean the restrictor jets under the cam carriers?

bluemouse1006:
Hi

Thanks for the reply No I cant remember doing that, will be removing the engine today and have a look at that. and let you know how I get on

Amos ;D

Bitsa (Ralph Wright - RIP):
Hi.
Under the cam carrier there should be 4 little o rings even though there is no hole for 2 this I believe is to keep the pressure up by sealing between the carrier and head.The oil comes out through the re stricter and then travels through the cam carrier and squirts out at pressure over the cam etc.Blow out the cam carriers with air.Did you use gasket goo?Too much can block the oil coming up the main oil studs.Hope this helps.
All the best

bluemouse1006:
Thanks for all your comments

Stripped the engine today and checked out the head oil restrictors and guess what the dry side was partially  blocked with what looked  like paint flecks, lesson to be learnt don't paint the engine casings and paint the inside with engine  paint or should i say over spray anyway .

I also decided to whip the sump off and check that and again loads of flecks of paint and some what looked like cleaning rag material this was partially blocking the oil pump filter !!!!  glad I stripped it as it could have happened again with the dry head Like playing Russian roulette with the engine ..

I still have to put fresh oil and another filter and hope that the oil gets up there but very very happy I actually found something after a days work .

Ill keep you all up[dated when I get her started again

Thanks again

Amos

Navigation

[0] Message Index

[#] Next page

Go to full version