Oil Pump
Fleet Owner
Joined: Jul 2004
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From: NM
Not having any idea what your pressure is hot/cold, what engine you have, what oil, what filter system, what gauge, etc, I would venture to say there is almost no chance it is just the oil pump or the gauge.
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I'm not sure what that means.
Fleet Owner
Joined: Sep 2005
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From: Lake Tahoe, Nevada
Those would be your crankshaft bearings. (Tired old motor syndrome.) Sounds like you need to get some help from someone knowlegeable about motors. You will need to drop the pan to check the bearings and the pickup screeen.
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Some guys are working on it this weekend. What's the difference between a good bearing and a bad bearing visually?
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Fleet Owner
Joined: Sep 2005
Posts: 28,609
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From: Lake Tahoe, Nevada
There is only a few thousandths of an inch difference. Worn bearings will usually "look" worn on the side that comes in contact with the crankshaft. Also, worn bearings may show some grooves or may appear to have a copper color to them. These are signs of excessive wear and that explains your "low oil pressure" and/or knocking sound in the motor.
Go to a parts store and buy a product called "Plasti-gague." You will also need a torque wrench. Follow the directions carefully.
If there are grooves or roughness in the surfaces of the crank where it contacts the bearings, (even just one!) then the engine will have to be overhauled or replaced.
Go to a parts store and buy a product called "Plasti-gague." You will also need a torque wrench. Follow the directions carefully.
If there are grooves or roughness in the surfaces of the crank where it contacts the bearings, (even just one!) then the engine will have to be overhauled or replaced.
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My truck was supposed to of had only about 8000 miles on it when I first got it and the rubber pads on the break and gas and clutch were not warn so I was told once that if the rubber is not warn that it could possibly be accurate millage. Since I got the truck I've went about 4500 miles. If this were the case and it is a relatively new unused motor but OLD: what would be causing the low oil pressure?
Fleet Owner
Joined: Sep 2005
Posts: 28,609
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From: Lake Tahoe, Nevada
If it is not caused by high milage, it could be due to running low on oil, overheating or abuse. Oil contamination could also be a cause.
There is an off chance that your oil pickup screen is clogged from sludge, which can cause low oil pressure.
You don't state what motor you have in your truck or it's age.
There is an off chance that your oil pickup screen is clogged from sludge, which can cause low oil pressure.
You don't state what motor you have in your truck or it's age.
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Junior User
Joined: Aug 2007
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If it is not caused by high milage, it could be due to running low on oil, overheating or abuse. Oil contamination could also be a cause.
There is an off chance that your oil pickup screen is clogged from sludge, which can cause low oil pressure.
You don't state what motor you have in your truck or it's age.
There is an off chance that your oil pickup screen is clogged from sludge, which can cause low oil pressure.
You don't state what motor you have in your truck or it's age.
Fleet Owner
Joined: Sep 2005
Posts: 28,609
Likes: 18
From: Lake Tahoe, Nevada
You might have been deceived about the mileage on you 1953 truck being only 8,000.
On the other hand, if it is as described, it may have sat for thirty years or more without an oil change. If so, the oil was likely to be contaminated with acids and water from sitting so long.
On the other hand, if it is as described, it may have sat for thirty years or more without an oil change. If so, the oil was likely to be contaminated with acids and water from sitting so long.
Fleet Owner
Joined: Jul 2004
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From: NM
Oil leaking or oil pressure? Two completely separate things. Maybe you should take it to a garage and have them work on it.