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Post by blue1985yota on Sept 28, 2004 21:25:28 GMT -5
My 1985 P/U goes through oil very fast. I checked it 2 weeks ago and it was bone dry, filled it up, check 2 days ago and its already back to being bone dry. Oil not leaking. I hear i have bad rings that are around the piston that are suppsoed to keep the oil under the piston btu its not so the oil is burning up... and theres a huge black streek by my muffler were i park my truck every day. Could it be something esle because it happend before and i put on carberator and it fixed it for a little bit untill i tried to pass emmision
i need help badly.
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madscientist
New Member
Those that know me dont need to ask, those that dont are better off not knowing
Posts: 28
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Post by madscientist on Sept 30, 2004 17:08:33 GMT -5
First off, the carb has nothing to do with the oil, so it didnt fix the problem, it was just a coincedence or the problem only appeared to correct itself (you fooled yourself, people do it all the time)
Now, if the oil level is dropping that much, but not leaking, then yes it would be that its being burned. Do you see any blue or black smoke? If its burning that much, you should see alot of it. Also the black nasty looking stuff at the muffler could very well be signs of burnt oil.
To find out for sure, you will need to do a compression test (but first look at the plugs when you pull them out for a black burnt-on coating). I'm not sure what the spec is, but the biggest thing to look for is a difference between the cyls (the difference between the highest reading and the lowest reading). After the initial test, dump about a spoonful of oil into the plug hole of the lowest reading cyl, and recheck, if the compression comes up a considerable amount, then the problem is the rings (the oil will seal the rings temporarily) if the compression doesnt come up, then it is probably the valves or valve stem seals. It could also be the head gasket, but that normaly shows signs of coolant in the oil, overheating, etc.
Another way to check (much better, if you have the tools to do it) is to bring the piston up to TDC (so both valves are closed) and hook up an air line to the plug hole forcing compressed air into the cyl. If you hear the air in the oil pan, pcv, or valve cover, the rings are leaking, if you hear the air coming out of the exhaust, the exhaust valve is burnt, and if you hear it coming out of the carb, then its the intake valve
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