Oil & Fuel Oil Pressure After New Pump??? Jinma 284

[buickanddeere]

Low oil pressure is not as bad a low oil flow. With a heavy single weight oil there will be low flow all thru the warming period. Pressure will be high but most of the flow would likely flow thru the relief valve. ... A multigrade is not so thick when cold and should flow amply to all parts. - Further, it will hold viscosity according to the higher number as it heats. A 20W50 will equate to 50weight when hot.

Missing the point that right now there is too little restriction and thus low pressure. The relief valve will open if there is too much pressure, that is why it is there. How is going up a grade or two going to blowup an engine that that is currently wearing out due to low oil pressure ?
5 pages of posts , no answers, a time consuming expensive engine tear down and new oil pump that gains nothing. and when I suggest trouble shooting with simply a grade or two heavier oil a couple of people get all offended?

 

[Bob Rooks]

Some people just can't think through a problem and troubleshoot. Tell us how straight 40 or 50 wt will blow up and engine and 15-40 won't ?

Hahaha. Don't troll me. Good day sir.

 

[SPYDERLK]

Does anyone know what normal operating pressures on the oil pump is supposed to be? I recently had to replace my oil pump on my Jinma 284 with the Y385 engine, man what a booger it was too. Anyway after the replacement I'm only seeing around 7-10 psi while I'm bush hogging, tractor is running around 180-200 degrees and I'm guessing it's running around 1600-1800rpms ( tach and hour meter quit working several years ago with around 540hrs on it ) I've used the oil gauge on the instrument panel and also recently put on a manual oil pressure gauge ( the manual one was installed prior to old pump replacement )

What else could cause low oil pressure? The new pump came with a new pickup tube and gaskets.

Is 7-10 psi normal/ok to run the tractor at?

Tractor has around 1000-1200hrs on it now guesstimating.

Any insight would be greatly appreciated.

Sorry for the delay. The pump was replaced due to the oil pressure being low after the engine warmed to operating temp 180-200degrees. It Would start out around 50psi the gradually drop to around 10psi. There is no abnormal sounds coming from the motor. When the oil pan was dropped there was very very minimal amount of metal shavings least non that caused any concern to me nor was there any type of trash or sludge buildup. The new replacement pump was a spot on match to the old one, so with that you could out the bolts bottoming out in the pan. Just for to rule out a bad gauge I went and got second mechanical gauge and swapped them out. Oil pressure at startup now is around 10 psi and running the tractor around 1600/1800rpms I'll see 25psi, but it will gradually drop to around 10 once the motor gets good and warmed up. I hope I answered most of the questions posted.

I've ran Rotella 15w40 ever since I got it 5 years ago. Bought it used with 362hrs on it. Hot pressure before was between 0.2mpa and 0.4mpa I never had a mechanical gauge on it up until a month ago when my pressure would drop a touch below 0.2 and my oil light would start flickering off & on.

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YES ... but its not adding up. Why would the oil light flicker at 29PSI? Thats why I think theres a problem with the decimal point on that original ??electronic?? gauge. Those readings dont come anywhere near agreement with the mechanical gauge nor with the low pressure light coming on. Move the decimal one place and it makes sense.

the mechanical gauge I have for it is just a inexpensive $12.99 jobber from oreilly auto parts, it's a equus mechanical oil pressure gauge. On the gauge face it has a peg for zero, then there is the next notch that isn't numbered I'm guessing maybe 10-12psi then the first numbered pressure is 25psi, when working the tractor the other day, digging gravel out of a creek bed my pressure at working temp was the notch between zero and 25.

OK. Do you have a conclusion? You have yourself in a corner. Things either contradict or youve made sure youre helpless to tell if they dont - and havnt made that clear until just now. Gauges are cheap. Find one that covers the subject pressure range. Google for one ~ 0-50.

 

[SPYDERLK]

Missing the point that right now there is too little restriction and thus low pressure. The relief valve will open if there is too much pressure, that is why it is there. How is going up a grade or two going to blowup an engine that that is currently wearing out due to low oil pressure ?
5 pages of posts , no answers, a time consuming expensive engine tear down and new oil pump that gains nothing. and when I suggest trouble shooting with simply a grade or two heavier oil a couple of people get all offended?

The point is to use a multigrade not a singlegrade at the high multigrade number. FLOW!

 

[SPYDERLK]

Some people just can't think through a problem and troubleshoot. Tell us how straight 40 or 50 wt will blow up and engine and 15-40 won't ?

Low oil pressure is not as bad a low oil flow. With a heavy single weight oil there will be low flow all thru the warming period. Pressure will be high but most of the flow would likely flow thru the relief valve. ... A multigrade is not so thick when cold and should flow amply to all parts. - Further, it will hold viscosity according to the higher number as it heats. A 20W50 will equate to 50weight when hot.

The answer is there. Understand that oil going thru the relief is not lubing or helping distribute heat in the engine. ... A recipe for damage.

 

[Bob Rooks]

You can tell by this gentleman's answers and posts that he has zero education on this subject. Don't waste your energy. Let's just concentrate on helping the OP.

 

[buickanddeere]

Hahaha. Don't troll me. Good day sir.

I see that when out of facts you have resorted to calling names .

 

[buickanddeere]

The answer is there. Understand that oil going thru the relief is not lubing or helping distribute heat in the engine. ... A recipe for damage.

The relief valve won't open until the engine is lubricated with oil at the proper pressure and flow . With the thinner oil the engine is not being properly lubricated .
Please explain how it is superior to operate with thin oil and not enough oil pressure vs operating with thicker oil and having enough oil pressure .

 

[buickanddeere]

The answer is there. Understand that oil going thru the relief is not lubing or helping distribute heat in the engine. ... A recipe for damage.

Oil passing through the relief is surplus oil that is not required to lubricante the engine . Thus no concern or problem if the relief valve opens just like the engineers designed it to once rated oil pressure has been achieved .

 

[SPYDERLK]

Some people just can't think through a problem and troubleshoot. Tell us how straight 40 or 50 wt will blow up and engine and 15-40 won't ?

Low oil pressure is not as bad a low oil flow. With a heavy single weight oil there will be low flow all thru the warming period. Pressure will be high but most of the flow would flow thru the relief valve. ... A multigrade is not so thick when cold and should flow amply to all parts. - Further, it will hold viscosity according to the higher number as it heats. A 20W50 will equate to 50weight when hot.

The answer is there. Understand that oil going thru the relief is not lubing or helping distribute heat in the engine. ... A recipe for damage.

The relief valve won't open until the engine is lubricated with oil at the proper pressure and flow . With the thinner oil the engine is not being properly lubricated .
Please explain how it is superior to operate with thin oil and not enough oil pressure vs operating with thicker oil and having enough oil pressure .

Oil passing through the relief is surplus oil that is not required to lubricante the engine . Thus no concern or problem if the relief valve opens just like the engineers designed it to once rated oil pressure has been achieved .

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