Engine bottom end knocking noise

Reply Subscribe

Thread Tools

Search this Thread

03-29-2010, 05:44 PM

#16

fivendime

Senior Member

Join Date: Dec 2008

Location: Washington State

Posts: 990

Likes: 0

Received 2 Likes on 2 Posts

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.

Reply Like

04-06-2010, 10:33 PM

#17

Dave888

Newbie

Thread Starter

Join Date: Jan 2010

Location: Canada Ontario

Posts: 9

Likes: 0

Received 0 Likes on 0 Posts

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 !!!

Reply Like

12-15-2010, 03:03 PM

#18

xjnewb

Newbie

Join Date: Dec 2010

Posts: 1

Likes: 0

Received 0 Likes on 0 Posts

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?

Reply Like

01-31-2016, 02:35 PM

#19

ericjcot

Newbie

Join Date: Jan 2016

Posts: 1

Likes: 0

Received 0 Likes on 0 Posts

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...

Reply Like

02-01-2016, 04:30 PM

#20

fatbill

Junior Member

Join Date: Jul 2011

Location: nova

Posts: 73

Likes: 0

Received 0 Likes on 0 Posts

Year: 1996

Model: Cherokee

Engine: 4.0

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

Name: image-2660041321.jpg
Views: 12966
Size: 55.1 KB

Reply Like

08-14-2017, 06:19 PM

#21

Epstein

Newbie

Join Date: Mar 2017

Posts: 17

Likes: 2

Received 1 Like on 1 Post

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?

Reply Like

08-25-2019, 07:04 PM

#22

20martinca

Newbie

Join Date: Aug 2019

Posts: 1

Likes: 0

Received 0 Likes on 0 Posts

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