SOHC.co.uk Forums > CB750
Crankcase seal leaking
Trigger:
--- Quote from: Rob62 on October 26, 2017, 01:22:43 PM ---Not all lip-seals are locked in place, most just press in.... so long as its the correct size and material...
--- End quote ---
Not all seals have 50 psi of oil pushing on the back of it. The lip is there for a reason.
And the seal in the picture is not a crank seal, I feel a bodge coming on and some damaged crank cases >:( looks like Fred Flintstone has already been in there.
ka-ja:
I agree with Trigger, Honda did not use that type of seal just to be awkward, they were used because they keep crankcase pressure/oil in as opposed to keeping oil splashes in, would hate one to "pop" out at high revs.
Bryanj:
That picture shows the wrong seal, there should be a definite "Lip" on the side with the metal washer. The one in there has been bodged in and is probably why its leaking BUT why was it done in the first place as these don't often leak, is there a bigger problem inside? I have a NOS one in my hand as its the same as a 500
Trigger:
Just for Paul Gledhill >>>>https://www.youtube.com/watch?v=tRsm2G7bulI
Laverda Dave:
If you go to the effort of prising out the old seal and replacing it with new seal only to find it still leaks you'll have to remove the engine anyway. There's an old but true saying 'it takes longer to bodge a job than to do it properly in the first place'. If Honda could have saved a few yen by fitting non lipped seals they would have done. Save yourself serious frustration and a potentially wrecked engine and fit genuine Honda seals, you can renew the cam and primary chains whilst you are in there and have a fresh engine.
Good luck with whatever option you go for and keep us posted.
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