SOHC.co.uk Forums > CB750
Help! What's caused this?
Bristolbadger:
--- Quote from: Trigger on March 30, 2022, 07:27:52 PM ---I thought you had this engine fully apart so, why is there so much sludge in the oil strainer. Engine building is down to clean , clean and clean again. All the oil ways will need a good clean including, the main oil gallery. You will only get the same problem again if there is one small bit tucked away in a oil way ;)
--- End quote ---
I'm not sure why either Trigger, I was as clean as could be, here's a pic of one half of the case before I put originally put her back together. Some was swarf from the freshly eaten tower & cam and some jelly like sludge possibly from the same
McCabe-Thiele (Ted):
FWIW I think you will have to split the engine casing again even if it's just for peace of mind - if you don't it will nag away at you afterwards.
K2-K6:
The sealant/blockage, by deduction, must have been present somewhere between the entrance where the oil filter bolt threads are (post filtration) and through the oil galleries from there onward until reaching the supply up the barrels.
I agree, that you can't be sure without much more extensive inspection.
I don't mind splitting them to work of them, would be more gutted to have it happen again though.
taysidedragon:
As Nigel says, the blockage must have been in an oil gallery where you can't see it. Being clean on the outside unfortunately doesn't help. Cases need to be opened to find and clear the problem. ☹
Bryanj:
I have seen that jet blocked by a piece of gasket fallen into the oil feed from cleaning off head or base gasket
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