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CB750 / Cb750 Oil pressure very high
« on: November 02, 2015, 12:07:37 PM »
Hello everybody
Has anybody had this problem before?
Recent full engine rebuild, now she is run in and I am up to full revs, the problem has shown itself.
Rolling chassis Cb750 F1 1976
Engine Cb750 K4 1974
Tickover no problems, when riding the oil tank overflow at the lowest part of the oil tank chucks oil all over the back tyre.
Possibilities
1, F1 oil tank is not suitable for K4 engine?
2, Pressure relief valve on oil pump is not working properly?
3, I'm thrashing her too hard!
4, when I recently rebuilt the engine I had a choice of 5 oil pumps from K & F1 engines, I chose the best condition oil pump that was well within the wear limits of the service manual and replaced all the o rings and the gasket, all the oil pumps looked the same, are there any different types or are they all the same from 1974 - 1976?
5. Oil tank was blast cleaned and powder coated, very hot process, maybe caused a problem within the oil tank?
All help appreciated
Nigel
Has anybody had this problem before?
Recent full engine rebuild, now she is run in and I am up to full revs, the problem has shown itself.
Rolling chassis Cb750 F1 1976
Engine Cb750 K4 1974
Tickover no problems, when riding the oil tank overflow at the lowest part of the oil tank chucks oil all over the back tyre.
Possibilities
1, F1 oil tank is not suitable for K4 engine?
2, Pressure relief valve on oil pump is not working properly?
3, I'm thrashing her too hard!
4, when I recently rebuilt the engine I had a choice of 5 oil pumps from K & F1 engines, I chose the best condition oil pump that was well within the wear limits of the service manual and replaced all the o rings and the gasket, all the oil pumps looked the same, are there any different types or are they all the same from 1974 - 1976?
5. Oil tank was blast cleaned and powder coated, very hot process, maybe caused a problem within the oil tank?
All help appreciated
Nigel