Track Day Winner
Join Date: Mar 2016
Location: Kingsville, on
Motorcycle: 86 Yamaha Venture, 84 Suzuki GS1150EF x 2, 93 GSXR 750
93 750 oil pump
Might sound unusual, however how much torque/tension/resistance should there be on the oil pump shaft once the water pump has been removed?
Found some bright and shinnies in the oil, a little too much to ignore anymore, and when I drained the coolant into a container I came across a few pieces of black metal, a couple as big as a peppercorn. Now, there wasn't a lot in the coolant, and it was not contaminated with oil or vise versa, but there's obviously an issue somewhere. I think I've traced the glittery oil to the cam journals and cam hold downs, they have some marks I don't like, however I've never seen metal in coolant before.
I removed the water pump (without breaking it tyvm) and inspected the impeller etc and have found nothing wrong there.
I've often wondered about an oil flow/pressure issue as previously I've seen different color oils (1 dark 1 light) in different pockets in the head under the valve cover even tho the oil pressure is within spec.
As with our old race car, I was thinking of priming the oil system and confirm good volume/flow from the oil galleries we could see and when trying to turn the oil pump shaft, just about broke my wrist. The drill spun instead of the shaft, I gotta say I wasn't expecting that to happen at all.
Should it spin pretty easily? The pan/filter/sensor are all still in the engine, there can't be any residual pressure inline somewhere is there? Is the pump toast? I really wasn't interested in splitting the cases to confirm what I fear the most, the by-product of splitting the cases is the 750 lump will end up as a paperweight and me looking for a 1000 or 1100 engine for this thing. Maybe 1 of the 1150 ef engines I have in a corner.....
Any suggestions, insight?
I measured the cam journals and lobes, and they are within spec however the journals have lines in them and the cams are close to being out of spec. I don't know what kind of life this old girl had before I got it, but I've been beating her up pretty good for 2 years now. For an $800 basket, it doesn't owe me anything at this point.
Any suggestions are welcome,