SOHC.co.uk Forums > CB350/400
Oil flow schematic
Laverda Dave:
--- Quote from: Oddjob on August 16, 2023, 06:16:41 PM ---That's the oil pump relief valve Matt.
All the gearbox and primary shafts are lubricated by the oil splashing around. The 550 got a small little pump on the end of the countershaft, I don't recall the 400 getting that
Just a thought but maybe the filter blocked at some time in it's life, the valve opened allowing all that swarf to pass around the engine before the filter was changed again
--- End quote ---
I'm pretty sure the 400 has two oil pumps Ken although they are both housed in the same oil pump body. The main pump is for the crank, big ends, valve gear etc. The smaller pump (the rotors are about 3mm thick) pumps oil to the gearbox shafts. Both pumps are driven by the same shaft with a pin driving the main pump via the inner rotor and a flat face machined onto the end of the shaft to drive the inner rotor of the gearbox pump.
Trigger:
--- Quote from: Laverda Dave on August 16, 2023, 09:54:53 PM ---
--- Quote from: Oddjob on August 16, 2023, 06:16:41 PM ---That's the oil pump relief valve Matt.
All the gearbox and primary shafts are lubricated by the oil splashing around. The 550 got a small little pump on the end of the countershaft, I don't recall the 400 getting that
Just a thought but maybe the filter blocked at some time in it's life, the valve opened allowing all that swarf to pass around the engine before the filter was changed again
--- End quote ---
I'm pretty sure the 400 has two oil pumps Ken although they are both housed in the same oil pump body. The main pump is for the crank, big ends, valve gear etc. The smaller pump (the rotors are about 3mm thick) pumps oil to the gearbox shafts. Both pumps are driven by the same shaft with a pin driving the main pump via the inner rotor and a flat face machined onto the end of the shaft to drive the inner rotor of the gearbox pump.
--- End quote ---
You are correct Dave and the gear box pump is sealed with 3 o'ring ;)
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