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Unread 10-23-2013, 10:40 PM   #1
Swampeast2
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Join Date: Sep 2013
Location: Lakeland, FL
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Oil Consumption?

My 1987 YJ 2.5 seems to be burning oil. The guy I bought it from apparently was a bit less than what I had hoped. It appears to be the valve stem seals, but how can I be certain? Is it better to just have the head rebuilt?

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Unread 10-24-2013, 05:16 AM   #2
bogleparsons
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2013 JK Wrangler 
 
Join Date: May 2011
Location: fayetteville, NC
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How much is it burning ?
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Unread 10-24-2013, 11:31 AM   #3
superj
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1987 YJ Wrangler 
 
Join Date: Mar 2008
Location: corpus christi, texas
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put it in idle and then put a dollar bill over hte exhaust tip. if your exhaust is not leaking, and the valves are good, the dollar will rhythmically flap. if the dollar pops, you have burned valves.

if you have someone start it in the morning with you watching the tail pipe and blue smoke comes out at start up, the valve seals leak a little while sitting. it if smokes on deceleration, blue smoke, the valve seals are leaking.

if it smoke while driving or idling, all the time, and is blue smoke, the rings are not sealing properly and you will probably have low or bad compression on some cylinders or all cylinders
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Unread 10-24-2013, 11:32 AM   #4
superj
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and the start up is the first start up of the day, when the engine is cold. not always going to work on a semi warmed up engine so firs start up of the day is the best for that check
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