SOHC.co.uk Forums > CB750

Oil pressure issue / motor rebuild

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MrDavo:
Judging by the many threads on here and dotnet, it seems we all go through this worrying dilemma every time a CB750 is rebuilt. If we couldn't see we wouldn't worry about it. None of these threads ends with an expensive clank, so it looks as if ! Once I get carbs and pipes back on, I just have to start her up and anxiously wait for the red light to go off.

I did use assembly lube, I'm glad I did now, I just never thought it would take so many turns before oil came into sight.

Trigger:
As I said, do not push the button. Even if the oil light goes out, this may mean that there is no oil to the top end, as the switch is at the bottom and not the top. You need to remove the tappet covers to see the oil at the cam first. There is a member on here that did fire start you bastard in to the carbs and press the button until he realised that the oil had not circulated the engine and the engine was toast >>> http://www.sohc.co.uk/index.php/topic,10867.0.html

Two out of ten engines that arrive in my workshop are damaged due to oil not circulating after the owner has built the engine. So keep kicking unless you know that you have not left a O ring out and the pump is working 100%, and all your oil ways are clear.

MrDavo:
Hmm, I am sure but I'll keep kicking, when is enough though? One wonders how many kicks is a filter full?

Maybe I should have opened the stopper valve when I primed the pump, otherwise how does it get that first 'glug' ?

royhall:
It takes a good while doing it on the starter before you see oil at the cam so kicking will take forever. Take your cam access caps off and keep the cam lobes lubricated with an oil can. Then just keep kicking.

Trigger:
If the cam has lube on it. I can't see the point in putting oil on it. It would be hard to see if oil has reached the top end.

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