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Old 12-06-2003, 02:34 PM
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GMC K2500 - 350 Top End Oil Problem

Yes ! This is my first post and I am not an expert by any means.

The problem described below happened unexpectedly one cold morning and has been happening ever since. Truck is a 98 and has 95,500 miles on it. Engine has seen relatively good care with regular oil changes and has never been overheated (to my knowledge).

When starting engine cold, I get a lot of noise from rocker arms. Lower end of engine seems fine. Oil pressure is very high at >80 psi during cold startup. Rocker arm noise will quiet down after 5 minutes or so when oil warms up to about 130 deg. Oil pressure will go back to normal 40-50 psi. A buddy made an inspection with a flashlight down through the oil fill cap and said he saw very little oil movement. When warm, engine seems to purr like a kitten with no evidence of any problem at all. This noise started happening abruptly one morning when I started it. No evidence of a gradual deterioration. Was using 10W-30, changed oil and filter to 5W-30 but no improvement. Was told by a local shop that lifters are bleeding down overnight. Any ideas ?.....Thanks.

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Last edited by bns2002; 12-07-2003 at 08:52 PM.
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Old 12-06-2003, 04:03 PM
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go to your nearest car quest and get a can of Sea Foam, pour it in the oil, start the vehicle and let it idle 20 minutes, then change the oil and filter.
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Old 12-06-2003, 05:49 PM
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i would try the sea foam first but if it still does it i would believe the lifters arent staying pumped up so when you start it and they pump up the noise goes away
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Old 12-07-2003, 12:52 PM
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What is Sea Foam and what do you think it will correct ? Do you have an idea of what is causing this problem ? Thanks.
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Old 12-07-2003, 01:54 PM
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Forget Sea Foam, Pour 2 quarts of paint thiner in the oil and run engine for 5 minutes. Drain and use 5/30 and a new oil filter. If this does not fix it then remove the rocker covers and use a flexible wire and try cleaning all of the return oil holes.
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Old 12-07-2003, 01:58 PM
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Quote:
Originally posted by Auto-Part
Forget Sea Foam, Pour 2 quarts of paint thiner in the oil and run engine for 5 minutes. Drain and use 5/30 and a new oil filter. If this does not fix it then remove the rocker covers and use a flexible wire and try cleaning all of the return oil holes.
Don't listen to Auto-Part! He is full of useless info.
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Old 12-07-2003, 04:59 PM
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How to clean crap out of Auto-Part:-
Open his mouth, pour 2 litres of thinners down his throat, drain him, if he can still move after 5 minutes clean him out with a flexible wire and clean all the return *** holes.
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Old 12-07-2003, 07:55 PM
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No one has described what they think the problem is. Sounds to me like you are pointing in the direction of an obstructed oil line. And based on the original problem description, probably a supply line rather than a return line. Is a supply line cleanable without a major disassembly ? Thanks.
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Old 12-07-2003, 08:00 PM
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I think you mean Oil Gallery`s, that`s what the Sea Foam does, it cleans the oil gallerys since the oil pump pumps it throughout your engine, if you only just have trash in the engine and the lifters are bleeding down then the Sea Foam will likely get it out, when you do your oil change after running it for 15 minutes you`ll be amazed at the trash that will come out with it. you can look up more info on Sea Foam here:
http://www.seafoamsales.com/
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Old 12-07-2003, 08:03 PM
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It wouldn't be a lifter noise if it took 5 minutes to quiet down.
Maybe it is piston slap.
http://www.pistonslap.com/

It could possibly be an exhaust leak.
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Old 12-07-2003, 08:50 PM
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It is most definitely rocker arm noise.
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Old 12-08-2003, 07:07 PM
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I purchased a can of Sea Foam and added it to the crankcase when I got home from work with the engine hot and ran it for 20 minutes. I then drained the oil and took the filter off. There was a lot of "gunk" in the filter and I was hopeful that I might be on to something. After adding 5 quarts of 5W-30 and replacing the filter I started the engine and the same rocker arm noise was present. Is is possible for there to be a mechanical restriction to a supply line to the upper part of engine ? Oil pressure has never been near 80 psi before but when I start it up cold, the oil pressure gauge pegs at >80 psi. This never happened before in the life of the engine. Thanks !!
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Old 12-09-2003, 11:54 AM
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Your probably going to need some additive that can stay in the oil, and clean the varnish out of the lifters, it may take some time! Rislone, or something like it!
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Old 12-11-2003, 03:10 PM
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Well, I received a couple of helpful hints. Other than that, I wouldn't exactly characterize this website as a wealth of information.
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Old 12-11-2003, 03:17 PM
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Quote:
Originally posted by bns2002
Well, I received a couple of helpful hints. Other than that, I wouldn't exactly characterize this website as a wealth of information.
I am of no help whatsoever, sorry.

Last edited by 4 Jaw Chuck; 12-12-2003 at 01:55 PM.
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