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8N blowing out oil

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C.Bowlick

04-17-2003 17:56:27




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Bought an 8N. Don't know the history I am beginning to think that the guy I bought it from picked it up at a auction. Anyway, it is blowing a good amount of oil out of the oil fill cover/vent. It has a exhaust manifold leak but I don't think that that would cause the problem. Someone told me that I may be getting blow by due to worn rings. Searching for an answer.




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Dave OH

04-17-2003 20:10:01




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 Re: 8N blowing out oil in reply to C.Bowlick, 04-17-2003 17:56:27  
Check the oil and see if it looks right. I would change it as you don't know how long it may have sat.
After you do the compression test I would put some Marvel Mystery oil in each cylinder to unstick possiably stuck rings. Let it sit 24 hrs. then start it. If still blowing do it again.
After that I would run it for a few days at not to high RPM's to see if the rings will reseat. Very the RPM's but don't try to set any speed records. Re-do the compression test and see if there is any progress.
Dave OH

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C.Bowlick

04-17-2003 20:41:15




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 Re: Re: 8N blowing out oil in reply to Dave OH, 04-17-2003 20:10:01  
Thanks for the information. I atleast have a direction to go in. The oil was really black and thick. Appeared to be of vintage age.



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C.Bowlick

04-17-2003 20:41:05




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 Re: Re: 8N blowing out oil in reply to Dave OH, 04-17-2003 20:10:01  
Thanks for the information. I atleast have a direction to go in. The oil was really black and thick. Appeared to be of vintage age.



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ED-IL

04-17-2003 18:57:37




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 Re: 8N blowing out oil in reply to C.Bowlick, 04-17-2003 17:56:27  
if you are getting oil out of the breathyer, then a compression test is in order.

you need a compression tester that screws into the spark plug hole.

5 cranks and write down the numbers, then pour a teaspoon of oil down the sparkplug hole and try it again, and write down the numbers.

the minimum psi that is acceptable is 90. If more than a 20 pound difference between wet and dry numbers, then worn rings. Otherwise it might be the valves.

The breather cap does breathe to allow condensation to escape from the crankcase - make sure it is not just steam you are seeing.

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