Who has replaced their 4.7 hydraulic valve lifters? - JeepForum.com
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Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > Who has replaced their 4.7 hydraulic valve lifters?

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Unread 02-10-2010, 11:14 AM   #1
WiCkeDuDe
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2002 WJ 
 
Join Date: Dec 2007
Location: Utah
Posts: 3,115
Who has replaced their 4.7 hydraulic valve lifters?

Wondering how common it is for the 4.7 hydraulic valve lifters/adjusters to go bad?

My WJ started ticking on the freeway the other day much louder than normal. It had a bit of a tick when cold, but went away when it warmed up. This was a loud constant tick.

I came home and shut her down. Came out about an hour later and started it up, no tick at all. Idling about 5 minutes it started to come back.

Pulled the valve covers, found the ******bag PO apparently didnt know you needed to change the oil. There was literally a half inch of sludge on the cam journals and heads. Pulled the cams out (This was okay as I needed to install my HO cams anyway) and found all the lifters were pretty caked with junk. I soaked the heads with engine brite, pulled the oil pan and then pressure washed the snot outta the heads. The crap that came outta the bottom of the engine was mind numbing. I didnt know an engine could run with such sludge but the pressure on it was good.

I pulled all the lifters and soaked them in parts cleaner. They all loosened up and move pretty good except for one that is solid and I cant get to move.

Im wondering how common it is for these to go bad? I debating wiether just to buy one hydraulic replacement, all 16 hydraulic, or go for the aftermarket solid adjusters. Any one running the solids?

Thanks guys!

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Unread 02-10-2010, 01:27 PM   #2
MGDWJ
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2004 WJ 
 
Join Date: Nov 2008
Location: Amarillo, TX
Posts: 1,022
contact www.airram.com he should be able to awser your question
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