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EFV-8 Club Forum / General Trucks Discussion / 0il pressure ??

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nuffsaid
01-30-2019 @ 6:25 PM
Member
Posts: 13
Joined: Jul 2018
          
I have low oil pressure in 50 f-1. no noise, or knocks. engine sounds good. been setting long time. Oil pump ? no sludge in engine.

alanwoodieman
01-30-2019 @ 6:53 PM
Senior
Posts: 664
Joined: Oct 2009
          
couple of questions, one- have you checked with a mechanical gauge? 2-do you have an oil filter?3-how long has the oil been in it and what viscosity are you using 4-low oil pressure cold or hot? or both?

carcrazy
01-30-2019 @ 7:53 PM
Senior
Posts: 695
Joined: Oct 2009
          
I would suspect the original electrical gauge. I have had this problem on a couple of 1953's and solved it by mounting a mechanical gauge either under the instrument panel or where the clock once resided. With my cars, when the in-dash electrical gauge showed about zero at idle the mechanical gauge showed about 20 PSI. I use an SAE 30 HD oil.

nuffsaid
01-31-2019 @ 11:31 AM
Member
Posts: 13
Joined: Jul 2018
          
Getting ready to apply mechanical gauge and see what it reads. it has an oil filter w/new filter, 10-w-40 oil. Engine hadn't been run in 20 years. It runs great, just not very high oil pressure. Got side tracked in the restoration of it.

alanwoodieman
02-01-2019 @ 6:34 PM
Senior
Posts: 664
Joined: Oct 2009
          
post the results of the mechanical gauge test and we will go from there. oil filter canisters have a restrictor orifice on the inlet of the filter, if this is removed the oil pressure will be very low

51f1
02-03-2019 @ 7:50 AM
Senior
Posts: 571
Joined: Oct 2009
          
Are you sure you have low oil pressure? The first thing to do is hook up a mechanical oil pressure gauge where your sending unit is connected and verify your pressure is low. Inexpensive gauges are available at car parts stores.

Richard

nuffsaid
02-03-2019 @ 12:38 PM
Member
Posts: 13
Joined: Jul 2018
          
hooked up manual gauge, oil pressure made it to 20. drove it for about 8 miles, then noticed the pressure dropping, and went to 0. never had that happen before. no knocking, nothing. checked oil, not low. noted fitting into filter had the restriction hole, cleaned it out before reinstalling it.

Fired truck up this morning, oil pressure went to 22, let truck warm up, at idle pressure went to about 12. only thing i can think of is something maybe to do with oil pump.

This message was edited by nuffsaid on 2-4-19 @ 7:01 AM

TomO
02-04-2019 @ 8:34 AM
Senior
Posts: 5892
Joined: Oct 2009
          
The easiest thing to try is to remove the oil pan and check the oil pump screen. if it is clean, then I would replace the oil pump. Some trucks has a cleanout plate on the oil pan. You could remove the plate and clean the oil pump screen. I don't think that you could remove the oil pump through the opening.

If replacing the oil pump doesn't give you at least 40 lbs cold and 30lbs hot at 1,000 rpm, you are looking at an engine rebuild. Your engine should have the 80# oil pump and the pressure relief valve is on the pump. My car engine has 60# cold and 50# hot at speeds above 20 mph with 10w-30 oil.

Tom

nuffsaid
02-04-2019 @ 11:13 AM
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Posts: 13
Joined: Jul 2018
          
Thanks Tom, Probably have it rebuilt. Then I won't worry so much about it.

TomO
02-05-2019 @ 9:14 AM
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Posts: 5892
Joined: Oct 2009
          
I would not rebuild a good running engine. You may be just throwing money away and you may introduce new problems. It is always bet to just fix the problem you have, rather than try to make the vehicle perfect. Very few shops do good work today and there are none that can make your engine perfect.

Have you checked the compression? Get the engine to normal operating temperature by driving the truck for about 30 minuted, remove all spark plugs, open the throttle all the way and with a fully charged battery check the compression on all cylinders. If any cylinders are more than 10 lbs less than the highest cylinder, add a small amount of oil to that cylinder to see if the reading changes, If it does you have worn rings, if it doesn't than you have a valve seating problem. Typical readings would be around 115 lbs.

If your compression is equal within +or - 5 lbs, your engine is probably not worn out and your oil pressure problem can most likely be repaired by cleaning the pump screen or replacing the pump. The restictor opening to the oil filter may also be enlarged, you can check to see if this is the problem by removing the line at the block fitting and plugging it. Then take a new reading of your oil pressure.

Tom

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