Plugged Oil Relief Channel

Bill M. From Illinois · May 23, 2019

Since my 2N overhaul (used engine I acquired) my cold Idle oil pressure runs 80 PSI or more. I would wait until engine warms up then go to work with it. I decided it was time to troubleshoot and determine if I could open restriction. I eventually determined I could run engine with plug, spring and plunger completely out with no oil spewing from front of engine. A swivel mirror and light indicates nothing jammed in hole. I guess I am SOL as there is no easy way to get at vertical channel or gallery that goes toward pump or main oil galley. I flushed the gallery and engine good before I overhauled but obviously did not get this. Who would of thought and how can it be so plugged as to hold back 80 PSI? Mt timing gears probably not getting lubed good either . Any suggestions welcome. Maybe pulling timing cover and trying to work wire into vertical part of hole? I see a risk of knocking something loose that can get in oil. Thanks

Jim L WA · May 23, 2019

Interesting. It has to be getting some oil onto the timing gears or they would have gone south by now. Don't ask me how I know that. Other than pulling the pan, and pump/front main cap and trying to clear the passage, I don't know. I wonder if it could even be a casting defect from when the block was originally cast. Did a worker have to drill that passage out? I don't know.

JMOR · May 23, 2019

(quoted from post at 13:47:59 05/23/19) Since my 2N overhaul (used engine I acquired) my cold Idle oil pressure runs 80 PSI or more. I would wait until engine warms up then go to work with it. I decided it was time to troubleshoot and determine if I could open restriction. I eventually determined I could run engine with plug, spring and plunger completely out with no oil spewing from front of engine. A swivel mirror and light indicates nothing jammed in hole. I guess I am SOL as there is no easy way to get at vertical channel or gallery that goes toward pump or main oil galley. I flushed the gallery and engine good before I overhauled but obviously did not get this. Who would of thought and how can it be so plugged as to hold back 80 PSI? Mt timing gears probably not getting lubed good either . Any suggestions welcome. Maybe pulling timing cover and trying to work wire into vertical part of hole? I see a risk of knocking something loose that can get in oil. Thanks

ooking carefully at the block casting, I believe that a wire could be inserted (oil pump removed) where pump feeds into block and the wire is almost a straight shot up to gallery, very slight bend, and on to back of relief valve. Then wire into relief valve area to meet with the other wire.

Bill M. From Illinois · May 23, 2019

I pulled the timing cover off old original engine and was able to work a mig welding wire into oil relief hole and then down a couple inches to get some idea what I am dealing with. I'm not too crazy about removing this engine but may become necessary. I'm wondering if a penetrating oil may break up rust enough to soften, if that's what it is. I can squirt it into relief hole where gravity should let it seep down. I need a micro roto rooter, LOL.

Plugged Oil Relief Channel

Bill M. From Illinois

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Jim L WA

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JMOR

Well-known Member

Bill M. From Illinois

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