Rocker arm preload and oil spurt from pushrod

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Sep 14, 2022 | 06:18 PM

bluejeep2001

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CF Veteran

Joined: Dec 2016

Posts: 1,736

Likes: 407

From: Long Island, New York

Year: 2001

Model: Cherokee (XJ)

Engine: 98 stroked 4.7

Rocker arm preload and oil spurt from pushrod

Like it says...i have been fighting a #2 misfire for a month. Have ruled out dozens of issues. Had the valve cover off to make sure nothing mechanical...a totally isolated cyl with no prev issues was occasionally spurting oil from the front rocker on nbr 3 . Do i need to increase pressure on nbr 3 or release pressure on that rocker...not sure of the process. Thanks

Sep 14, 2022 | 07:38 PM

That Jeep Guy XJMJ

CF Veteran

Joined: Jun 2009

Posts: 2,610

Likes: 446

From: Michigan

Year: 1987 MJ, 1973 J2000, 1986 XJ, 08 JK

Model: Comanche (MJ)

Engine: 4.0L H.O

Rockers should be torqued to spec. as far as i know there isn't adjustability from the factory setup.

Sep 23, 2022 | 06:09 PM

97grand4.0

CF Veteran

Joined: Nov 2015

Posts: 2,856

Likes: 201

From: syracuse ny

Year: 1997

Model: Grand Cherokee (ZJ)

Engine: 4.0, new lifters valve job with new springs and exhaust valves, preload set with shims

They are not adjustable but that does not mean you don't set the preload clearances. You have a collapsed lifter there. All the oil pressure to the lifters is escaping that one gusher, leaving the others dry. You'll need to take the head off and replace all the lifters and the critical part is to set the preload on the new ones. If you don't know how to do that there are complete tutorial threads you can search on here.
Then change the oil and filter.

Last edited by 97grand4.0; Sep 23, 2022 at 06:11 PM.