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Discussion Forum
:

OIL IN #4 CYL

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Dave Wi.

05-15-2003 08:44:59




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My WD45 has oil in #4 cyl,whats your oppinion.
should I pull the motor and do a complete or drop the pan and pull the head and do sleeves and rings,havent started taking apart yet.




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Tom Miller

05-15-2003 12:27:26




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 Re: OIL IN #4 CYL in reply to Dave Wi., 05-15-2003 08:44:59  
You might have a ring in that cylinder that got installed upside down and that would turn it into a pump pulling oil into the cylinder instead of scraping the excess oil down back into the pan.



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Steve in N.J.

05-15-2003 09:53:25




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 Re: OIL IN #4 CYL in reply to Dave Wi., 05-15-2003 08:44:59  
Dave, Kevin pretty much hit it on the head there. A pretty worn valve guide on #4 cylinder could easily be the problem which would be minor compared to a major overhaul. Oil could be running down the guide over night, splashing and oiling up the plug when you crank the engine over. Because that plug is misfiring all the time, it never gets a chance to clean itself up, so it continually gets worse.....
Steve/B&B Custom Circuits

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Kevin (FL)

05-15-2003 09:40:28




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 Re: OIL IN #4 CYL in reply to Dave Wi., 05-15-2003 08:44:59  
Dave,

Run a compression check on all four cylinders. Write down the max pressures on each. Should be close to 100 PSI. The #4 cylinder may be lower. (Compression rings may be OK, but might have bad oil ring.) Whichever cylinder is noticeably lower than the others, squirt some oil in that cylinder and run test again. If pressure goes up, compression rings are bad. If pressure doesn't change, problem could be in valves. Then you would want to pull the head and check valves, seats and springs. The only other way I know to get oil in the cylinder is through a bad valve guide. Before I started tearing down the engine, I would do a little more troubleshooting. One other question--are you seeing much crankcase blowby coming out the breather when the engine is running? And make sure you have good plugs and good copper wires and all plugs are firing good.

Report back if you can and we'll go from there.

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Dave Wi.

05-15-2003 12:08:43




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 Re: Re: OIL IN #4 CYL in reply to Kevin (FL), 05-15-2003 09:40:28  
Boy I hope yer right,asked once before about white smoke going up hill thought it might be a guide or pluged return,[white smoke oil,black gas]
everyone thought it was water.If it's a guide might do the whole head,cant get at it till saturday.



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