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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 01-12-2020, 12:31 PM   #11 (permalink)
DieselPro
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Only option is to pull pan and replace oil pump and insert new rod and main bearings.

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Old 01-12-2020, 12:46 PM   #12 (permalink)
dannhepannhe
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So can i do this with the engine in the car or do i have to lift it out?
What more than crankshaft main bearings and connecting rod bearings and oil pump should i buy? Like gaskets? I live in Sweden so dont wont to forget to buy anything lol.

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Old 01-12-2020, 03:02 PM   #13 (permalink)
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Have you tried to replace the oil filter? last check and cheap.
I read some member with collapse oil filter and cause the oil pressure to be low.
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Old 01-12-2020, 03:28 PM   #14 (permalink)
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Oil filter and thicker oil won't help. When the bearing clearances get to worn the oil once hot is too thin and the oil filter even if it was plugged solid would be bypassed by the bypass valve. So no easy fix. Might try the later style oil pump for the oil squirter type engine, maybe someone can show if indeed they do have larger oil pumping rotor. I have no experience in this so proceed on your own.
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Old 01-12-2020, 03:37 PM   #15 (permalink)
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Might try > https://www.6-5liter.com/oil_pump.html
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Old 01-13-2020, 06:23 PM   #16 (permalink)
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Quote:
Originally Posted by JMJNet View Post
Have you tried to replace the oil filter? last check and cheap.
I read some member with collapse oil filter and cause the oil pressure to be low.
Clarifying my statement.

I am not saying that oil filter WILL solve the issue.
What I am saying is some people got a BAD oil filter which ended up to be collapsing internally that can cause low oil pressure.
Although, it is probably less than 1% chance but worth checking before tearing up the engine.

With part quality which is not very good nowadays, we need to check everything.
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Old 01-14-2020, 10:17 AM   #17 (permalink)
tugboat94
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When I had the same issue on my 6.5 suburban. I removed the oil filter housing all together and replaced all the seals I think there was three total orings for the base, banjo bolt and one more.... I also swapped the oil cooler lines bc I was already there. I went from 10psi at 70mph on gauge to 65psi..... The oil filter relocation mod is one of the best imo wish I had done that
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Old 01-14-2020, 12:27 PM   #18 (permalink)
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One more thing to check.
Do the oil lines that go to the oil cooler appear to be new? Reason I ask this is. The person you bought the truck from may have had a oil line failure. This is a common problem with the original oil cooler lines. When they break, the engine instantly looses oil pressure. By the time the engine is stopped the damage to the bearings is done.
If the lines look like they may have been replaced. Then the old lines most likely broke, causing severe bearing damage which did not get repaired.
Also check the oil filter as said above. There are 2 oil bypass valves on the 6.5 engine. One is in the oil filter housing in case the oil filter gets blocked. The other is in the block to restrict flow of oil thru the cooler in cold temperature when the oil is thick, until the oil warms up. One of these bypasses may be stuck open causing a loss of pressure.
If it does turn out to be worn bearings. You also need to replace the camshaft bearings. They are usually the first to go bad in low or no oil pressure situation
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Old 01-16-2020, 08:27 AM   #19 (permalink)
654L80
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You could try replacing the oil pump with one for a 1998. These pumps are higher flow because they had piston cooler jets. This will not fix the worn bearing issue but may be a cheap fix compared to rebuilding the engine.
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