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8N Oil Pressure During Engine Flush

E

equeen

Member
Should oil pressure gauge reflect any oil pressure during a 3 minute engine run with diesel fuel instead of engine oil? A Ford 8N.
 
Add this to oil and follow directions

https://www.amazon.com/Liqui-Moly-2037-Pro-Line-Engine/dp/B00CR3RXTO/ref=sr_1_2?dchild=1&keywords=engine+flush&qid=1632447027&sr=8-2
 
Over the years, I've heard of people doing engine flushes on automobiles and tractors with things like kerosene and diesel, and I this ALWAYS makes me cringe. Modern detergent motor oils (since the '80s at least) don't seem nearly as prone to sludging as the old formulas. Oil changes are cheaper than engines; as the earlier post said, simply change the oil.

I can remember 40 years ago hearing people talk about the virtues of adding a little diesel to their gasoline tanks on their cars. And those always tended to be the same folks who complained about premature drivetrain failures.
 
Thanks, Indiana Ken. Just wanted confirmation in what I found during the flush. I wasn't expecting any pressure and did not get any - and I've heard various opinions thru the years of flush/don't flush. Today we fill with new oil and filter and see how things look/work. Regardless of how things go, I will NOT have any recommendations to either flush or not flush 70 year old tractor engines with cruddy oil.
 
(quoted from post at 07:29:40 09/24/21) Thanks, Indiana Ken. Just wanted confirmation in what I found during the flush. I wasn't expecting any pressure and did not get any - and I've heard various opinions thru the years of flush/don't flush. Today we fill with new oil and filter and see how things look/work. Regardless of how things go, I will NOT have any recommendations to either flush or not flush 70 year old tractor engines with cruddy oil.
Click to expand...

I would prime the oil pump BEFORE restarting it, likely the oil pump has lost it's prime and there's no point in starting it and running the bearings "dry" while HOPING it will prime.

Some take out the oil pressure relief valve and squirt oil in the oil gallery, I use a (dedicated) pump up garden sprayer connected to the oil gauge port.

Dump a quart of engine oil in the sprayer, pump it up to pressurize it and oil will be forced through the oil galleries to the bearings and all the way to the oil pump PREVENTING a "dry start".
 
In the old days,many people used a 1/2 quart before an oil change to flush gunk from an engine. Havng said that,running anything beside oil through a running engine would be disastrous,eventually. The flush shoukld be run only a couple of minutes after being run on the oil being changed is warmed up. As already said,modern oils have ingredients to suspend gunk,so simply drainiing while fully warmed is sufficient. When I changed my oil pump,I figured that I'd find tons of crap,but the pan was clean.
 
Back in the 80's at the end of the last of the non detergent oils, we learned that running an aggressive flush on what we called a "quaker state engine" would break loose large chunks of sludge and plug the lifters, oil galleys, and puckup screen and often destroy the engine.... We found that it was better to just use detergent oil and let it gradually clean away the gunk over a few years....

If you wanted to clean it fast, you needed to disassemble the engine....
 
Thanks to everyone for their responses.

As stated in the post, the engine oil system had been flushed for approx 3 mins with diesel. There was zero pressure recorded while operating the engine during the flush. Oil pressure had been at 20 before the flush.

After flushing and overnight drain then new filter, new 30 wt oil and 1 qt of Lucas Oil Stabilizer, the oil pressure gauge promptly registered 20 after engine restart and stays around 20 during a number of starts/stops.

Tentative conclusion (which I assume could be reached by anyone in this instance): No indication thus far that flushing the engine with diesel either helped or hurt as to raising the oil pressure. Simply no effect. But, pleased that we did it and learned whatever we learned from the personal experience.

Aain, no recommendation from me as to flush an old engine or not flush. If folks would have kept the oil and filter changed properly during the 70 or so years, the oil would not have been dark black and flushing wouldn't even had been a question.
 
(quoted from post at 13:07:06 09/24/21) Thanks to everyone for their responses.

As stated in the post, the engine oil system had been flushed for approx 3 mins with diesel. There was zero pressure recorded while operating the engine during the flush. Oil pressure had been at 20 before the flush.

After flushing and overnight drain then new filter, new 30 wt oil and 1 qt of Lucas Oil Stabilizer, the oil pressure gauge promptly registered 20 after engine restart and stays around 20 during a number of starts/stops.

Tentative conclusion (which I assume could be reached by anyone in this instance): No indication thus far that flushing the engine with diesel either helped or hurt as to raising the oil pressure. Simply no effect. But, pleased that we did it and learned whatever we learned from the personal experience.

Aain, no recommendation from me as to flush an old engine or not flush. If folks would have kept the oil and filter changed properly during the 70 or so years, the oil would not have been dark black and flushing wouldn't even had been a question.
Click to expand...
ell it has been more than a few minutes....has it grenaded yet? You will tell us how long it ran before boom!, right?
 
(quoted from post at 02:07:06 09/25/21) Thanks to everyone for their responses.

As stated in the post, the engine oil system had been flushed for approx 3 mins with diesel. There was zero pressure recorded while operating the engine during the flush. Oil pressure had been at 20 before the flush.

After flushing and overnight drain then new filter, new 30 wt oil and 1 qt of Lucas Oil Stabilizer, the oil pressure gauge promptly registered 20 after engine restart and stays around 20 during a number of starts/stops.

Tentative conclusion (which I assume could be reached by anyone in this instance): No indication thus far that flushing the engine with diesel either helped or hurt as to raising the oil pressure. Simply no effect. But, pleased that we did it and learned whatever we learned from the personal experience.

Aain, no recommendation from me as to flush an old engine or not flush. If folks would have kept the oil and filter changed properly during the 70 or so years, the oil would not have been dark black and flushing wouldn't even had been a question.
Click to expand...

Black oil is not necessary a bad thing if its doing its job its gonna get black.
 
Flushing isn't something I would attempt on any engine, but that's just me. An engine on an N series is pretty basic, no hydraulic lifters or any other things the oil needs to do aside from lubricate. If it has oil pressure it's good. Running an engine with no oil pressure is bad. The most extreme I would go as far as cleaning an oil system on a running engine might be to put some auto transmission fluid or Marvel Mystery oil in with the engine oil to run for a short time just before changing.
 
Eman85, Yes I agree with you.Also he is liable to find out what happens to a engine run without any oil pressure huh. :cry:
 
I'm thinking that if it built pressure while running it with diesel that it might actually be worse than no pressure as the diesel would quickly flush out any residual oil film. Hard to say without trying it and I'm certainly not going to volunteer any engine of mine that I want to keep.
 
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