SOHC.co.uk Forums > CB750
CB750 K3 Oil leak
sim2011:
Hi
According to Mark Paris's book a skim of .010" (0.25mm) is fine on the K3 as they had 1mm more deck height than the K0-K2 engines , I cant see that .5mm will make any diference to cam chain tension.
Any way just reasemmbled the engine this morning, I will recheck head bolt torque later on today.
I opted for Blue Hylor for both the base and head gaskets after checking their site its perfectly ok for High temp.
Just a thin smear was used both sides.
Next report will be later this week when I get a helping hand to put the lump back in.
Thanks for everyones input.
Simon
Bryanj:
Simon I did check that cylinder as i said and the deck height is approx 1mm with the counterbore being 0.9mm Cant remember how that ties up with yours
K2-K6:
Hope you've got it with that, it's nice when they run well and you know you can get a reliable run out on it.
UK Pete:
Fingers crossed, hope all turns out well this time
pete
K2-K6:
Here's a slightly different angle on it which may explain some of the experience old-v-new gaskets etc.
This era or production has covered the removal of asbestos from head gaskets so any original specs that used it would have to have been re-formulated. Commonly they went from asbestos to graphite and one of the characteristics that changed was it was more common for liquids to creep through the new ones, making it common practice to have a sealant where none was needed prior to this.
Graphite type gaskets also need retorqueing on some arrangements also and this is never part of the plan for SOHC 750 motors due to the need to remove from frame to work on. I'm guessing this but it may be why they are more succesful with sealant with the types available now both Honda and pattern.
There is a piece written in current "Classice Bike" along these lines, not specfically dealing with this application but if you overlay the info contained with our experience and the timeline involved I think you can form a more thorough resoning as to the use of sealant or not.
I guess this impacts many of the bikes on here.
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