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kdracer73 · 05-15-2013, 05:44 PM

I think the 4.0 motors are prone to valve issues. The valves stop rotating in the guide, causing abnormal wear. We pull the rockers and look for scoring on the valve tips. Not sure what years are effected, but there is a factory TSB.

05-15-2013, 05:44 PM	#7
kdracer73 Senior Member Join Date: Apr 2008 Posts: 1,557 Tweet	I think the 4.0 motors are prone to valve issues. The valves stop rotating in the guide, causing abnormal wear. We pull the rockers and look for scoring on the valve tips. Not sure what years are effected, but there is a factory TSB. __________________ I drive a hybrid, It burns gas and rubber.. Alcohol Tobacco & Firearms should be a convenience store, not a government agency.