| Re: [GMCnet] Tid Bits: Oil consumption. It's all in how/where it's consumed. [message #336452 is a reply to message #336450] |
Mon, 27 August 2018 22:43   |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma:
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Senior Member |
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Bob,
What you did saved that unit a rebuilt and gave it more life.
Unless we put on lot of miles, your approach is very great. Thanks for
sharing your experiances.
On Mon, Aug 27, 2018 at 7:54 PM Bob Dunahugh wrote:
> 6 years ago. I knew someone that got very upset that their engine
> consumed one qt every 300 miles. So we looked at the spark plugs. All the
> spark plugs showed about the same as to discoloration/deposits. The
> compression test came in at reasonable numbers. At 115 to 123 psi. Not
> great. But not bad. Inspection camera showed oil washing around the edges
> of the pistons. All washing on all pistons was about the same width. Again.
> Not a great sign. But not bad. Just expected. Put a dial indicating
> micromotor to the top of each rocker arm. Just looking for consistency
> between all the intake. Then all the exhaust. Looked good. But that test
> doesn't show how much the lifters are dished. Or how much of the cam lobes
> are gone. Again used the inspection camera to check the cam gear/chain. Had
> been changed at some past point. Warm oil pressures were13psi at idle.
> 21psi at speed. This is a candidate for a high volume oil pump. But the
> pump could over load the piston oil control rings. That are already over
> loaded. Thus it could up oil consumption. I suggested running it as is. And
> run a heavier oil. He's been using 20W50 oil. Still running well. Oil
> consumption has been at about 400 miles per qt. If the engine had all the
> oil consumption issues in just one or two cylinders. That's time for a
> rebuild. As for what's best for you. Not my monkeys. Not my circus. Bob
> Dunahugh
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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