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Old 11-07-2023, 05:59 PM   #1
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6.5 L engine oil pressure

2002 GMC 6.5 L diesel engine the oil pressure is hanging around 20. The engine was flushed and new oil and filter installed today.
The pressure is still around 20.

Is the next step a new oil pump?
Or is there something else that might improve the oil pressure ?

Thanks

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Old 11-07-2023, 06:44 PM   #2
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Location: topeka kansas
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Year: 1954
Coachwork: wayne
Chassis: old f500- new 2005 f-450
Engine: cummins 12 valve
Rated Cap: 20? five rows of 4?
20 psi

what is the engine temperature and rpm when you have a reading of 20 psi?

william
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Old 11-08-2023, 06:21 AM   #3
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The engine temperature is 200 degrees.
There is no tachometer so I don't know the rpms.
Can you recommend a good OBD sensor for monitoring the details of the engine including rpm?
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Old 11-08-2023, 01:21 PM   #4
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Join Date: May 2018
Location: topeka kansas
Posts: 1,778
Year: 1954
Coachwork: wayne
Chassis: old f500- new 2005 f-450
Engine: cummins 12 valve
Rated Cap: 20? five rows of 4?
oil pressures

from the reading I have done engine at idle, and oil up to temperature. 20 psi is normal. driving at speed cold, around 75-80 psi maximum. 50-75 psi oil warmed up driving down the road.

william
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Old 11-08-2023, 03:58 PM   #5
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Location: mid Mo.
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Year: 1976
Coachwork: bluebird
Chassis: F33695
Engine: 427 chevy converted to 466
Rated Cap: 84
I had one that the oil pressure was terrible when cold but got better after warm up, intake screen was clogged with little wax balls from high paraffin Pennsylvania oil. Installed a pump and pick up and all was good. How is your oil pressure when cold? If it's good when cold and dives down when warmed up it could be the pump but most likely needs crank bearings. Not a bad thing, they might be worn quite a bit, as long as Mario isn't trying to peck his way out of the engine with a hammer.
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Old 11-08-2023, 04:31 PM   #6
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Thanks for the information.
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