Engine bottom end knocking noise

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Mar 29, 2010 | 05:44 PM

#16

fivendime

Senior Member

Joined: Dec 2008

Posts: 990

Likes: 4

From: Washington State

Year: 1996

Model: Cherokee

Engine: 4.0L HO

If its only a problematic noise at start up and idling and after it warms up a bit it goes away I am leaning toward a failing/bad wrist pin.

Apr 6, 2010 | 10:33 PM

#17

Dave888

Thread Starter

Newbie

Joined: Jan 2010

Posts: 9

Likes: 0

From: Canada Ontario

Year: 1999

Model: Cherokee

Engine: 4.0 L

Problem is fixed !!

Hey thanks everyone for the help. Turns out it was the connecting rod bearings like I thought at first. I polished up the crank using smooth scrubbing pad like they use in the body shops. I put new bearings in and its running smooth again. Should be good for many more thousands of km !!!

Dec 15, 2010 | 03:03 PM

#18

xjnewb

Newbie

Joined: Dec 2010

Posts: 1

Likes: 0

Model: Cherokee

Quote:

Originally Posted by Dave888

I have a 92 cherokee. I just finished doing the rod bearings and the entire top end including lifters and the head compleatly rebuilt and I still get a bottom end knocking noise. It a steady constant noise that doesn't get better or worse. Iv checked everything.
Any other ideas?

Jan 31, 2016 | 02:35 PM

#19

ericjcot

Newbie

Joined: Jan 2016

Posts: 1

Likes: 0

Model: Cherokee

New here same noise

Quote:

Originally Posted by fivendime

If its only a problematic noise at start up and idling and after it warms up a bit it goes away I am leaning toward a failing/bad wrist pin.

Not to sound dumb but what is a wrist pin...

Feb 1, 2016 | 04:30 PM

#20

fatbill

Junior Member

Joined: Jul 2011

Posts: 73

Likes: 0

From: nova

Year: 1996

Model: Cherokee

Engine: 4.0

It connects the piston to the connecting rod.
#5 in the pic

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Aug 14, 2017 | 06:19 PM

#21

Epstein

Newbie

Joined: Mar 2017

Posts: 17

Likes: 1

Model: Cherokee

Quote:

Originally Posted by fatbill

It connects the piston to the connecting rod.
#5 in the pic

Attachment 282607

I have a knocking noise and hard starting got worse with bigger tires. I know it's a old post but I need help?

Aug 25, 2019 | 07:04 PM

#22

20martinca

Newbie

Joined: Aug 2019

Posts: 1

Likes: 0

Model: Cherokee (XJ)

Quote:

Originally Posted by mj6886

hey not to thread jack here at all but im brand new here and my jeep is doing exactly what you described with the knocking on start up and reving the motor. i just bought it and it started doing this. do you know what it could be? thx again hoping im not thread jacking

Quote:

Originally Posted by xjnewb

I know this is an old post but do you/anyone ever figure this out I just did the same thing with my 2000 xj and I’m still hunting down a knocking noise