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Blue smoke from your Allis C is never good...


 
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Jack in NY
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Joined: 25 Feb 2013
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PostPosted: Thu Apr 25, 2013 10:41 am    Post subject: Blue smoke from your Allis C is never good... Reply to specific post Reply with quote

I have an early CE engine (CE76xx)that"s burning oil badly. Oil pressure is good and oil hasn"t been overfilled.

Question is: it"s also puffing blue smoke out the oil fill tube. Can I use that to narrow it down to a valve problem, or could a bad ring also cause that? (Or, how much of this thing am I going to have to tear apart?)

Thanks!
 
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Dusty MI
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Location: Lansing MI. area

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PostPosted: Thu Apr 25, 2013 11:09 am    Post subject: Re: Blue smoke from your Allis C is never good... Reply to specific post Reply with quote

Do a compression check on each cylinder.
 
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Jack in NY
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PostPosted: Thu Apr 25, 2013 1:36 pm    Post subject: Re: Blue smoke from your Allis C is never good... Reply to specific post Reply with quote

That would give me the offending cylinder(s) but can
it be used to tell if it's a valve problem vs a ring
problem?
 
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Jack in NY
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PostPosted: Thu Apr 25, 2013 1:39 pm    Post subject: Re: Blue smoke from your Allis C is never good... Reply to specific post Reply with quote

(Valves, no sweat; any further than that and I'd
probably part it out and start over...)
 
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DiyDave
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PostPosted: Thu Apr 25, 2013 4:14 pm    Post subject: Re: Blue smoke from your Allis C is never good... Reply to specific post Reply with quote

Do a wet copm test on the low cyl. Squirt some motor oil (tablespoon full or 2) into the low cyl(s), If Comp goes up, it's rings. If not, it's likely valves, guides or seals,
 
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Dick L
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PostPosted: Thu Apr 25, 2013 5:27 pm    Post subject: Re: Blue smoke from your Allis C is never good... Reply to specific post Reply with quote

If it is valve guides the smoke will be heavy after start up and then get light to none after running a while. Having good oil pressure on that engine only tells you that the oil pump is good. The bearings can be shot and knocking and have good oil pressure. Oil to the bearings comes from centrifugal force thru the spinning camshaft. It is sent thru the camshaft bearings to the main bearings. Little holes spray oil on the rods and the spinning of the rods catch the oil and forces it into the rod bearings. Compression is a good place to start.


 
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Dick L
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PostPosted: Fri Apr 26, 2013 3:06 am    Post subject: Re: Blue smoke from your Allis C is never good... Reply to specific post Reply with quote

Knowing the history of the engine would be good. After a compression check and it if it came up good or fair after and engine has set or had been stuck, you can have the stuck oil rings (bottom ring)in the pistons. You can some times use seafoam free and clean up that ring by working the engine hard for several hours with the seafoam in the oil and gas.
 
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