Topic: 1978 CB750K — Post 836 OIL PRESSURE - Seems bad :(

[SKTP]

I just removed my pipes and drained the oil (cold).

I got 450ml from the side tank

and 1850ml from the engine plug and oil filter.

EDIT: another 100ml from the oil-pan

This is 2.4 liters (or 2.53605 quarts)

I am wondering if a low oil level has been the cause of all of my problems? But I am thinking this is a average amount of oil when draining the bike...there's got to be a bunch of oil still in the motor..correct?

[SKTP]

Oil pump is out and I am returning to Ken at Cycle-x. He is going to test it for me.

There was some black "gaskety?" grit in the pan and one sliver of non-magnetic metal. Nothing of note in the oil filter cover.

[HondaMan]

While rare, I have seen the tunnel warped where the Overpressure Relief valve lives. This makes it sort of oval, and then the piston sticks slightly open in it. The tunnel cane be re-bored, though, to make it round again. I have 2 in my "to be rebuilt" box of pumps that are like that, and they both caused the majority of oil in the tank to drip into the cases - faster when hot, slowly when cold, much like an old Bonneville 650 twin would do.

It happens mostly because the metals used were not really intended to last 50 years...

[PeWe]

2.4L should not be dangerous too low.
I refill with ca 2.9L at an oil change with new filter.

I have leaned the bike to the right when it had stopped dripping and a little more came out.

If 0.5L short. Oil level should be visible on the stick, maybe half.

[BenelliSEI]

When looking for “debris” open the folds of the paper oil filter element. The glitter usually ends up deep in the “V” part.