Jeep 4.0 oil only coming out of one pushrod.
I have a 1988 jeep Cherokee I bought a rebuilt bottom end engine and with an ho head and I put it on after we soaked the lifters and put it all back together and primed the oil pump but no oil would come out of any of the rockers with just the drill so we started it up and it had good oil pressure so we didn't even think to check but after i changed the oil at about a 150 miles we popped the oil cap off to see if there was any visible blow by which there wasn't any but it didn't seem like there was much oil on the rockers so we took the valve cover off and started it up and only one pushrod actually sprays the oil out of it when you rev it up and was wondering if any of you guys have seen anything like this before. Thanks for any advice.
CF Veteran




Joined: May 2012
Posts: 7,965
Likes: 964
From: Lost in the wilds of Virginia
Year: 1998 Classic (I'll get it running soon....) and 02 Grand
Model: Cherokee (XJ)
Engine: 4.0
Too lazy to use proper punctuation? Expect us to sort your your word salad?
I have better things to do, like helping people who are willing to respect my time and effort to help them.
I have better things to do, like helping people who are willing to respect my time and effort to help them.
Old fart with a wrench
Joined: Nov 2010
Posts: 14,398
Likes: 741
From: Manlius, east of Syracuse, NY
Year: 2000 XJ Sport & WJ Laredo
Model: Grand Cherokee (WJ)
Engine: 4.0L
Did you check or set the valve lash when you put it together? Probably not. Lifter plunger preload is important when putting together mismatched or milled heads. Do a search for "lifter preload" with Google or this site. CCKen has a good post on it and many others have discussed it. Zero lash + 3/4 turn gives you .042" preload. Anymore it too tight, any less isn't enough. Use shims to adjust if too tight.
Last edited by dave1123; Mar 21, 2020 at 04:00 AM.
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