SOHC.co.uk Forums > CB750

Oil leak sussed (hopefully)

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dieffe:
After the engine going in and out three times now I have finally got to the bottom of the latest oil leak and it isn't pretty.
In the past the cam chain has been slopping about something chronic in the tunnel, in fact there is evidence it has probably snapped at some stage. There is a massive groove on both sides of the tunnel resulting in a hole that someone has tried to fix with what looks like Araldite.
Number four piston has a slight chunk out of the top of it, nothing serious, just a nick and number one piston is a new one which suggest a valve to piston get together. The slipper is new as are the roller wheels on the tensioner and also the cam chain looks new. There is also a new can carrier for some reason.

Anyway, if you are of a weak disposition look away now.

A bit of wear me thinks.


Yep, definitely wear.


Araldite failing in it's repair task.


Luckily I got hold of another set of barrels so it is quite an easy fix. (he says)

If this doesn't sort out the oil leaks I give up.

royhall:
I had a DOHC CB750K years ago (1980 me thinks) that did a similar thing. The oil leak on that strangely showed up by keeping blowing the gear change shaft seals. Ended up selling the bike for a song as I knew nowt about engines back then. Actually sometimes, I'm not too sure I know anything about engines now either. ;D ;D ;D

Green1:
I know nowt but I do know that's not right.

Trigger:
That is something i have never seen on one of these bikes. If it has cut that much away, were has all the alloy gone ?

JamesH:
Holy Fu*ck. That is pretty shocking....

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