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Jubilee piston rings


 
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TBJ
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Joined: 24 Feb 2006
Posts: 43


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PostPosted: Sat Sep 01, 2007 7:15 am    Post subject: Jubilee piston rings Reply to specific post Reply with quote

Hi all, just pulled pistons from a smoking jubilee engine and noticed the middle ring on each cylinder appeared to be installed upside down. The ring has a Dot on one side and an inside bevel on the other side, the dot was installed down and the bevel up, shouldent the dot be up and the bevel down? Would this cause the engine to smoke if this ring was installed wrong on all cylinders? The tractor started and ran well with 50# oil pressure, but smoked blue out the exhaust. Thanks
 
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ZANE
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Joined: 10 Aug 1998
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PostPosted: Sat Sep 01, 2007 2:49 pm    Post subject: Re: Jubilee piston rings Reply to specific post Reply with quote

The dot is usually installed up.

I do have a rule of thumb though that I have used for the past 50 years and it has served me good.

"inside up, outside down"/ This is refering to the undercut on a ring. Somebody else may have known about my "rule of thumb" too?

I doubt that was the cause of the smoking engine.

Place a couple of the old rings back in the cylinder and measure the gap between the ends of the ring. That is the best indication of wheather or not the rings are worn out. That and if the ring has any interference spring fit into the bore when you do this check. If it has no spring out that can also contribute to smoking engine.

Zane
 
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TBJ
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PostPosted: Sun Sep 02, 2007 1:59 am    Post subject: Re: Jubilee piston rings Reply to specific post Reply with quote

Thanks Zane, I can always count on you for a quick and knowlegable reply . You and others are a treasure on this forum and I am very greatful for your help.
TBJ
 
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