| Re: [GMCnet] Tid Bits: Oil consumption. It's all in how/where it's consumed. [message #336454 is a reply to message #336452] |
Mon, 27 August 2018 23:10   |
sgltrac
Messages: 2797
Registered: April 2011
Karma:
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Senior Member |
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Bob,
If a heavier viscosity oil at operating temp was desired wouldn’t a 30 or
40 weight been better than a 50 ? Or was most of the oil lost when cold?
Sully
Bellevue.
On Mon, Aug 27, 2018 at 8:44 PM Jim Kanomata wrote:
> 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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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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