| what could be a small film on TOP of oil/additive? [message #224749] |
Mon, 07 October 2013 06:36  |
budworks521
Messages: 137
Registered: October 2013
Location: Grand Rapids MI 1974 Pain...
Karma: 4
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Just before I removed my heads and intake I drained 2 quarts of oil to see if I have coolant in the oil. It appeared to be coolant free but I did notice that the oil had a slight film and clear in color and was wondering if it was gas? Does gas blend with oil? It was right on top of the oil. The shop added an additive to the oil to meet the requirements of that engine. Does the additive mix well when drained? I did read about carbs flooding could lead to gas in oil? Is there a way to check rings on pistons to see if they are bad? I did notice some slight deviations in the walls. Like minor scratches and such. Thanks
1974 Painted Desert
455 upper half rebuild
constant project inexperienced mechanic
Grand Rapids Mi
Always trying to learn
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| Re: [GMCnet] what could be a small film on TOP of oil/additive? [message #224753 is a reply to message #224749] |
Mon, 07 October 2013 07:56  |
Jeff Marten
Messages: 199
Registered: August 2013
Karma: 1
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If it's on top of the oil it isn't water. Water has a higher specific gravity (liquid density) than oil, so it will sit on the bottom of the container. Any water in the oil pan would have come out first. If gas has a lower specific gravity than oil, it will form a layer on top of the oil. Could be the additive, but I'd think additives would be fully miscible with the oil.
You can check the rings by doing compression and leak down tests once the engine is back together. A large ridge at the top of the cylinders is a good indicator of wear. Minor scratches may simply be the hone pattern on the cylinder walls, hard to say without eyeballing it.
If the carb is flooding, fuel will get past the rings and into the oil.
> To: gmclist@temp.gmcnet.org
> From: budworks521@yahoo.com
> Date: Mon, 7 Oct 2013 06:36:49 -0500
> Subject: [GMCnet] what could be a small film on TOP of oil/additive?
>
>
>
> Just before I removed my heads and intake I drained 2 quarts of oil to see if I have coolant in the oil. It appeared to be coolant free but I did notice that the oil had a slight film and clear in color and was wondering if it was gas? Does gas blend with oil? It was right on top of the oil. The shop added an additive to the oil to meet the requirements of that engine. Does the additive mix well when drained? I did read about carbs flooding could lead to gas in oil? Is there a way to check rings on pistons to see if they are bad? I did notice some slight deviations in the walls. Like minor scratches and such. Thanks
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1985 Gulf Stream 34' Sun Stream
1964 Falcon 'Vert
1980 Bradley GTE
1999 Chevy Tahoe
2005 Saab 93 Aero
1987 Suzuki Intruder 1400
1978 Glastron/Carlson CV23
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| Re: [GMCnet] what could be a small film on TOP of oil/additive? [message #224754 is a reply to message #224753] |
Mon, 07 October 2013 08:14 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Scratches in line with piston travel area indicator of particles traveling
up and down with the piston. Not a good thing to see. If it is severe, it
is called scoring. It will result in loss of compression, increased piston
to cylinder friction, and high oil consumption. Usually an indicator of
dirt, carbon particles, metal chips, broken rings or piston ring lands, or
gasket material from a top end overhaul left behind when the engine was
worked on by a mechanic. If it is prevalent throughout all cylinders, it is
overhaul time in my professional opinion.
Jim Hupy
Salem, Or.(currently in Coos Bay)
78 Gmc Royale 403
On Oct 7, 2013 5:56 AM, "Jeff Marten" <jtmarten@msn.com> wrote:
> If it's on top of the oil it isn't water. Water has a higher specific
> gravity (liquid density) than oil, so it will sit on the bottom of the
> container. Any water in the oil pan would have come out first. If gas has
> a lower specific gravity than oil, it will form a layer on top of the oil.
> Could be the additive, but I'd think additives would be fully miscible
> with the oil.
>
> You can check the rings by doing compression and leak down tests once the
> engine is back together. A large ridge at the top of the cylinders is a
> good indicator of wear. Minor scratches may simply be the hone pattern on
> the cylinder walls, hard to say without eyeballing it.
>
> If the carb is flooding, fuel will get past the rings and into the oil.
>
>
>
>
> > To: gmclist@temp.gmcnet.org
> > From: budworks521@yahoo.com
> > Date: Mon, 7 Oct 2013 06:36:49 -0500
> > Subject: [GMCnet] what could be a small film on TOP of oil/additive?
> >
> >
> >
> > Just before I removed my heads and intake I drained 2 quarts of oil to
> see if I have coolant in the oil. It appeared to be coolant free but I did
> notice that the oil had a slight film and clear in color and was wondering
> if it was gas? Does gas blend with oil? It was right on top of the oil. The
> shop added an additive to the oil to meet the requirements of that engine.
> Does the additive mix well when drained? I did read about carbs flooding
> could lead to gas in oil? Is there a way to check rings on pistons to see
> if they are bad? I did notice some slight deviations in the walls. Like
> minor scratches and such. Thanks
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: what could be a small film on TOP of oil/additive? [message #224760 is a reply to message #224749] |
Mon, 07 October 2013 08:52 |
budworks521
Messages: 137
Registered: October 2013
Location: Grand Rapids MI 1974 Pain...
Karma: 4
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Senior Member |
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The engine has 135k on it and the maintenance on it was awesome. Clean engine and ran great until this issue. I am just trying to figure out if my intake manifold could be cracked from the high heat and if that can lead to stuff getting into the oil. My initial issue was seeing my temp rise from 3/8 to 1/2 on gauge and then noticing coolant leaks near distributor area and then running down heads in back of engine. The gaskets on head were rusty a bit and never saw coolant in oil. Just that film. The engine would idle and rev fine but was losing power in drive upon acceleration. The plugs were burning great with no oil on them. Maybe I was getting a small amount of coolant in the piston area and losing power??? Is that possible? Thanks EVERYONE for the help. I am in great need of it.
1974 Painted Desert
455 upper half rebuild
constant project inexperienced mechanic
Grand Rapids Mi
Always trying to learn
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| Re: what could be a small film on TOP of oil/additive? [message #224762 is a reply to message #224760] |
Mon, 07 October 2013 09:42 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Quit guessing what its in the oil. Send a sample into Chuck Boyd's contact in Knoxville, or Blackstone Labs in Fort Wayne. There may also be a local lab that will do it for you. Many truck places have it done locally.
This way you will know for sure what is in it.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: what could be a small film on TOP of oil/additive? [message #224778 is a reply to message #224749] |
Mon, 07 October 2013 11:22 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| budworks521 wrote on Mon, 07 October 2013 07:36 |
Just before I removed my heads and intake I drained 2 quarts of oil to see if I have coolant in the oil. It appeared to be coolant free but I did notice that the oil had a slight film and clear in color and was wondering if it was gas? Does gas blend with oil? It was right on top of the oil. The shop added an additive to the oil to meet the requirements of that engine. Does the additive mix well when drained? I did read about carbs flooding could lead to gas in oil? Is there a way to check rings on pistons to see if they are bad? I did notice some slight deviations in the walls. Like minor scratches and such. Thanks
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Bud,
It could be alcohol...
Gasoline is more soluble in lube oil than is alcohol.
Alcohol is only somewhat soluble in gasoline which is why you can pull it out with water.
This is just the other side of the the same equation.
Matt - at home fighting with his computers.
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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