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CB500/550 / Oil pressure relief valve removal
« on: April 18, 2024, 07:36:34 AM »
Hello All,
I’ve a suspected high oil pressure problem on my 1978 CB550k3. I’ve just completed a complete engine strip down and rebuild (new gaskets everywhere). I’ve had oil coming out of my cam cover bolts (the ones inside the rubber gasket/seal). I’ve also had real problems getting my cam end cap seals to stop leaking. The breather hose at the top of the engine is clear and not kinked and I’ve blown into the engine from here to check it’s not blocked in the top cover. A really helpful chap on this forum suggested it might be a stuck oil pressure relief valve so I took out the 14mm cap on the oil pump and the spring came out but I wasn’t able to get the plunger out. Should it fall out with the spring or do I need to remove the oil pump to push it out from the inside? I wasn’t keen to take the pump off again as I had real problems getting it to seal last time. An egg cup full of oil did drop out with the spring suggesting oil is getting past the plunger possibly?
I will take the pump off if I need to but am I barking up the wrong tree here?
Any input would be appreciated.
Thank you.
I’ve a suspected high oil pressure problem on my 1978 CB550k3. I’ve just completed a complete engine strip down and rebuild (new gaskets everywhere). I’ve had oil coming out of my cam cover bolts (the ones inside the rubber gasket/seal). I’ve also had real problems getting my cam end cap seals to stop leaking. The breather hose at the top of the engine is clear and not kinked and I’ve blown into the engine from here to check it’s not blocked in the top cover. A really helpful chap on this forum suggested it might be a stuck oil pressure relief valve so I took out the 14mm cap on the oil pump and the spring came out but I wasn’t able to get the plunger out. Should it fall out with the spring or do I need to remove the oil pump to push it out from the inside? I wasn’t keen to take the pump off again as I had real problems getting it to seal last time. An egg cup full of oil did drop out with the spring suggesting oil is getting past the plunger possibly?
I will take the pump off if I need to but am I barking up the wrong tree here?
Any input would be appreciated.
Thank you.