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Normal then Low Oil Pressure

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rcwilbur

05-17-2004 07:41:20

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I have an IH 504 that had an oil pressure guage installed when I bought it. I recently changed the oil/filter and put in 10W/30 oil. When the tractor first starts the oil pressure is about 55psi, but once the engine warms up it drops to about 20psi. I'm curious why the pressure would be about normal when starting but then drop so much after operating.

I read in the service manual that the normal oil pressure should be about 45. Should I be concerned about 20psi? If so is there an easy way to tell whether it is the oil pump?

Thanks,

Carl.

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Jim J

05-18-2004 08:14:03

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Re: Normal then Low Oil Pressure in reply to rcwilbur, 05-17-2004 07:41:20

The 504 uses the same oil pump as the C and the oil pump cover warps and then the gasket blows and then you have low oil pressure.

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rcwilbur`

05-18-2004 11:12:01

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Re: Re: Normal then Low Oil Pressure in reply to Jim J, 05-18-2004 08:14:03

Thanks Jim. Since the oil pressure is 55psi on start up it seems like the oil pump is capable of developing the appropriate pressure. Is it possible that the oil pump cover warps more when it gets hot thereby reducing its pumping pressure?

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Mark

05-17-2004 08:15:20

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Re: Normal then Low Oil Pressure in reply to rcwilbur, 05-17-2004 07:41:20

Had the same problem on my H. Upon starting it ran about 55 to 60 lbs. After warm up it would drop to 15 lbs. I checked my main bearings with plastiguage and found they were warn I replaced my main bearings .002 oversize. Replaced my oil pump spring and now my pressure pegs out at 70 to 75 upon start up and drops to 40 to 45 after warm up. It was pretty easy to replace bearings.

Mark

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rcwilbur

05-17-2004 08:55:10

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Re: Re: Normal then Low Oil Pressure in reply to Mark, 05-17-2004 08:15:20

I just got done putting the tractor back together after replacing the clutch. Do you have to split the tractor to replace the main bearings?

Is it possible to check for wear without splitting?

Thanks,

Carl.

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lee

05-17-2004 07:53:53

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Re: Normal then Low Oil Pressure in reply to rcwilbur, 05-17-2004 07:41:20

Odds are it's worn engine bearings. How many hrs?
You could try a 10-40 oil or a straight weight oil. Is it 20 psi at full rpm or idle rpm?
If it were the pump you probably wouldn't have 55 psi cold.

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rcwilbur

05-17-2004 08:51:29

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Re: Re: Normal then Low Oil Pressure in reply to lee, 05-17-2004 07:53:53

I'm not sure how many hours the engine has on it--the proof meter doesn't work.

The oil pressure is 20 PSI when at full throttle and then slightly less perhaps 15 at idle.

Would it be better to put the 10/40 in? Is there anything I can do short of a rebuild or should I just let things take their course.

Thanks for responding,

Carl.

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rcwilbur

05-17-2004 09:57:49

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Re: Re: Re: Normal then Low Oil Pressure in reply to rcwilbur, 05-17-2004 08:51:29

Thanks Bob and Lee for you replies. I will take the 10-30 out and replace it with the heavier weight oil.

I'm a novice mechanic, although I did manage to split the tractor and replace the clutch pressure plate and rear crank seal recently. I was wondering why the main bearings would cause the pressure to drop. Is there a short explanation?

Thanks again for your help.
Carl.

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lee

05-17-2004 12:06:27

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Re: Re: Re: Re: Normal then Low Oil Pressure in reply to rcwilbur, 05-17-2004 09:57:49

The oil pump pumps oil thru a system of oil galleries to the crank main bearings and to other places depending on the engine (ie., to the rod bearings if the crank is drilled for pressure lube to the rods, to the cam bearings if the block is drilled appropriately) so as bearings wear and clearance opens up the oil flows more freely thru the bearings and pressure drops. Pump clearances open up also and there are known issues with the flatness of the plate at the bottom of the pump. If ambitious you might drop the pan and re-build your pump to see if an improvement can be realized.

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rcwilbur

05-17-2004 13:41:50

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Re: Re: Re: Re: Re: Normal then Low Oil Pressure in reply to lee, 05-17-2004 12:06:27

Thanks Lee.

I appreciate the explanation. I may drop the oil pan at some point, but I think I'll just use heavier oil for the time being. I just got done putting the tractor back together after replacing the clutch. My wife was glad to have the tractor out of the garage after two weeks and I just finshed cleaning the garage floor.

Thanks again.

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lee

05-17-2004 16:03:10

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Re: Re: Re: Re: Re: Re: Normal then Low Oil Pressu in reply to rcwilbur, 05-17-2004 13:41:50

You might consider buying my BN with wide front
It's been restored complete and carries plenty of oil pressure. It's photo add # 68900.

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lee

05-17-2004 09:43:50

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Re: Re: Re: Normal then Low Oil Pressure in reply to rcwilbur, 05-17-2004 08:51:29

good oil suggestions by Bob below,, you are OK for some time, just watch it and don't lug it down
My B had zero oil pressure hot still running but I decided to rebuild, that's extreme but yes you still have run time left. Keep it full of oil.

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Bob

05-17-2004 09:08:36

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Re: Re: Re: Normal then Low Oil Pressure in reply to rcwilbur, 05-17-2004 08:51:29

Put 15-40 or better yet, 20-50 in it for the summer months.

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