up-date on 99T oil prssure.

Ol' Ron

Ol' Ron

Well-known member
Well today I got back to checking the 99T? (41) for oil pressure. Yesterday I pulled the front relief valve apart and it seemed to be in working oreder with a pretty hefty spring. I pulled the cam gear and found the plug in place. So the leak must be someplace else.
I rigged an air hose to the rear of the block and ran low pressure through the engine. had to put a plug in the passage way to the oip pump. With that done i applied about 5lbs of air into the main line only to find all th air coming out the front relief valve.. So there must be something wrong with the seat, I'll look for a small ball bearing, see if that shuts it off. Tune in tomorrow.
 
Ford tractors give me hell on oil pressure.I have an old one now that appears to have NO oil pressure,yet it must, because an engine will not stay together without oil pressure at least to the correct places.I don't think enough oil would splash up to keep it from knocking for long.Good skill with your 59AB.
 
Hello Ron, Isn't there a slanted flat spot on the valve plunger that is supposed to put oil to the cam gear and water pumps?
 
Yes, unfortunately I think the relief valve is open for some reason. I'm not getting any air out of the bearings. My eyesight isn't good enough to see into the bottom og the relief to see what the condition is. The flat isn't big enough to pass all that, I hope. A new education on the ford lubrication system.
Personaly I don't think it's necessary to have a relief valve in the pump.
 
Ol' Ron said:
Yes, unfortunately I think the relief valve is open for some reason. I'm not getting any air out of the bearings. My eyesight isn't good enough to see into the bottom og the relief to see what the condition is. The flat isn't big enough to pass all that, I hope. A new education on the ford lubrication system.
Personaly I don't think it's necessary to have a relief valve in the pump.
Click to expand...
Ron, I don't know why the 59 engine has 2 reliefe valves either. Did you take the one out of the pump and check it? Walt
 
Sounds like your spring is short or not as hefty as it looks. Try a piece of 1/8" brass pipe 3/16" long on the spring then adjust the thickness to get the oil pressure you want spinning the engine on 12 volts with the plugs out. G.M.
 
WellI think the spring is pretty strong, I had a hell of a time putting it back in.
The pump has had the bottom cover reversed. Not sure if I did that or someone else.
Will use a ball bearing tomorrow.
 
Well I installed the ball bearing and the leak stopped. I ran the airpressure up to about 10 lbs and began rotating the crank at certian points in the rotation alott of air came out of the crank throws. I assumed this was normal, because thid aligned the oil hole in the main to align with the crank theow. But jus to be sure I pulled a bearing.
Baring was trash and I hope the crank can be saved. The worst part of this story is: I've known this engine ever since it was rebuilt and who did it. Only thing left is to tear it down, and check everything.
Getting tired Ron
 
Leakage from that plunger must have dropped the pressure enough to thrash those bearings. The Lycoming aircraft engines I work on most, all use a ball bearing for the oil pressure relief. That seat must have some kind of an irregularity going on there.

Kerby
 
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Engine went back in storage, Have too much on my plate now, and not much time left to do it all. Though this might be a quicky.
Pistons for Ben's engine arrived today, back to reality.
Cramps
 
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