Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
All the oil goes through the filter, unless the valve in the oil filter bolt is stuck, in which case it will bypass the filter. Maybe check the valve is moving?I had the genuine oil flow schematic for the CB500, printed on a large cardboard plate. Nicked it from Queenies when they were throwing it out along with one of the full engine in an exploded diagram. Unfortunately the shed roof leaked on them and ruined them Isn't there one in the workshop manual? the 500 has one.
If you need the insides I have some spares, waste throwing away a good bolt head, if the heads knackered anyway no harm done.
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 thatJust 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
Quote from: Oddjob on August 16, 2023, 06:16:41 PMThat'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 thatJust 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 againI'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.