1994 Dodge Truck oil pressure

Tiny
BONJIMINY
  • MEMBER
  • 1994 DODGE TRUCK
Engine Mechanical problem
1994 Dodge Truck V8 Four Wheel Drive Automatic

After replacing a thermostat, (which I assume has nothing to do with my problem) while towing in the Mtns, my oil pressure slowly dropped to nothing, followed by engine niose (valves, lifters?). After putting in a new oil pump, the probems persists. When cold, I get 40# pressure, after engine warms up, (or viscocity of oil drops) it drops to nothing again. If rpm's are maintaned, slight oil pressure is maintaned. I'm told that the only way of fixing this is to take apart the engine, or put in a new long block. This can't be right.
Please help
Jim
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Monday, July 13th, 2009 AT 11:47 AM

7 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
If you are loosing pressure at an idle and hearing knocking and ticking, chances are the rod and main bearings are worn. You may be able to get away with just replacing the bearings if the crank is in good shape. I wouldn't jump to a long block until checking the crank with plastigauge.
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Monday, July 13th, 2009 AT 12:59 PM
Tiny
BONJIMINY
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I realize now I failed to mention that the engine is a rebuild with only 30K on it. Can bearings wear out in that little of a time, or was it a sub-rate rebuild?
Thanks for the help.
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Tuesday, July 14th, 2009 AT 9:37 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Have you kept the oil changed?
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Wednesday, July 15th, 2009 AT 11:27 AM
Tiny
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Yes I have.
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Wednesday, July 15th, 2009 AT 11:45 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
If you have it should still be like new. Was the engine purchased as a rebuild or did someone do the work on your engine? As far as I'm concerned, either way, it shouldn't have happened, and you deserve some amount of restitution.

Let me know if you have other questions. I will try to help in any way I can.

Joe
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Wednesday, July 15th, 2009 AT 4:40 PM
Tiny
BONJIMINY
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Thanks Joe, unfortunatley I bought it from a guy with 10K on it. Warrenty's over as well.
Thanks for the help, appreciate it.

Jim
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Thursday, July 16th, 2009 AT 9:51 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Jim:
With that few of miles on it, this never should have happened. I feel bad. Listen, you may be better off just replacing the crank and bearing in the engine. It would be much less than a new one. Ask your mechanic to check that out for you. Even if the crank is bad, you should be ahead of the game unless labor rates are really high where you live.

Let me know if you have any other questions, and thanks for using 2carpros. Com

Joe
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Thursday, July 16th, 2009 AT 11:33 AM

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