4.0 engine knock
#1
Junior Member
Thread Starter
Join Date: Jul 2011
Posts: 90
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
4.0 engine knock
Yeah another one of these kinds of posts..
I haven't tore into it yet, just wanted to see what you pros thought..
Here it is.. What ya think..
I haven't tore into it yet, just wanted to see what you pros thought..
Here it is.. What ya think..
#2
Seasoned Member
Join Date: Jun 2011
Location: Garden Prairie
Posts: 281
Likes: 0
Received 1 Like
on
1 Post
Year: 2000, (1957 Willys)
Model: Cherokee
Engine: 4.0L
Well,
I have a 2000 sport. I had a similar 'tap'/'knock'. I pulled the valve cover and started her up. I had poor lubrication through the pushrods. I replaced the lifters and the noise disappeared. I also had oil flying everywhere. 5 lifters were shot, the other 7 were poor performers.
You will hear that replacing lifters without replacing the cam is a mortal sin. It's not, replacing the CAM without replacing the lifters is the no-no. https://www.cherokeeforum.com/f2/roc...uestion-96005/ Have a listen.
I have a 2000 sport. I had a similar 'tap'/'knock'. I pulled the valve cover and started her up. I had poor lubrication through the pushrods. I replaced the lifters and the noise disappeared. I also had oil flying everywhere. 5 lifters were shot, the other 7 were poor performers.
You will hear that replacing lifters without replacing the cam is a mortal sin. It's not, replacing the CAM without replacing the lifters is the no-no. https://www.cherokeeforum.com/f2/roc...uestion-96005/ Have a listen.
Last edited by Moncheche; 07-25-2011 at 01:59 PM. Reason: Additional info
#3
Seasoned Member
Join Date: Jun 2011
Location: Garden Prairie
Posts: 281
Likes: 0
Received 1 Like
on
1 Post
Year: 2000, (1957 Willys)
Model: Cherokee
Engine: 4.0L
What's your oil pressure at idle? Just curious.
I'd pull the valve cover and have another look/listen session. Shoot some more video if you can.
I'd pull the valve cover and have another look/listen session. Shoot some more video if you can.
#4
Junior Member
Thread Starter
Join Date: Jul 2011
Posts: 90
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
Oil pressure is somewhat stead at around 47-48 at idle. I think that's what I'm gonna do. Pull the cover, see what I can see. Grab a video and ask the pros.
#5
Junior Member
Thread Starter
Join Date: Jul 2011
Posts: 90
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
Took off the cover, to take a look.
Some of them are bone dry, even with RPMs up. Some of them are just really slow and poor, a few of them are filled with oil.
Sorry about the squeal, vacuum lines off.
But heres a look with the shop light. I might try to prime them with a little oil, and if it quiets down, that's the ticket..
Some of them are bone dry, even with RPMs up. Some of them are just really slow and poor, a few of them are filled with oil.
Sorry about the squeal, vacuum lines off.
But heres a look with the shop light. I might try to prime them with a little oil, and if it quiets down, that's the ticket..
#6
Junior Member
Thread Starter
Join Date: Jul 2011
Posts: 90
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
Before I tear into this too far.. I'm going to give some mystery oil a shot. Maybe it frees things up and gets the oil flowing again.
I have heard good things about it. Worth a shot..
I have heard good things about it. Worth a shot..
Trending Topics
#8
Seasoned Member
Join Date: Jun 2011
Location: Garden Prairie
Posts: 281
Likes: 0
Received 1 Like
on
1 Post
Year: 2000, (1957 Willys)
Model: Cherokee
Engine: 4.0L
Did you see my video? My lifters were shot and the lubrication was just like yours. Each lifter contains two springs. The tiny (I mean baby hair thin) spring was useless and my lifters had corrosion that MMO wasn't going to cure. I would pull each lifter, one at a time to see if you are destroying your cam.
If the lifters look decent, replace em. You will double your lubrication. I wish I had video of my new lifters in action. Do you recall the John Wayne movie where he fought oil well fires? That's how it looked with the new lifters. OIL FLYING OUT.
Looking forward to your outcome.
If the lifters look decent, replace em. You will double your lubrication. I wish I had video of my new lifters in action. Do you recall the John Wayne movie where he fought oil well fires? That's how it looked with the new lifters. OIL FLYING OUT.
Looking forward to your outcome.
#9
Junior Member
Thread Starter
Join Date: Jul 2011
Posts: 90
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
Yes I did,
And I am glad you posted that.. You were dead on with your diagnosis..
How much did replacing the lifters cost you?
I am on a tight budget, just want to get this thing on the road, until I can afford either a rebuild kit, or a reman engine.
And I am glad you posted that.. You were dead on with your diagnosis..
How much did replacing the lifters cost you?
I am on a tight budget, just want to get this thing on the road, until I can afford either a rebuild kit, or a reman engine.
#10
Seasoned Member
Join Date: Jun 2011
Location: Garden Prairie
Posts: 281
Likes: 0
Received 1 Like
on
1 Post
Year: 2000, (1957 Willys)
Model: Cherokee
Engine: 4.0L
I bought the lifters from Napa, or Autozone. They were 5.50 each. x12.... Around 70 after tax.
If you pull everything, line everything up so everything goes back where it came from. I numbered the bridges with a sharpie before pulling, and I punched 12 holes into a box, numbered those, and placed the push rods into those. It should go very smoothly for you.
I pulled the lifters with a small wire, bent sharply at the end. I don't have a magnet that would fit down there.
Good luck!
If you pull everything, line everything up so everything goes back where it came from. I numbered the bridges with a sharpie before pulling, and I punched 12 holes into a box, numbered those, and placed the push rods into those. It should go very smoothly for you.
I pulled the lifters with a small wire, bent sharply at the end. I don't have a magnet that would fit down there.
Good luck!
Thread
Thread Starter
Forum
Replies
Last Post
Ye Ol' Cherokee
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
8
10-09-2015 10:29 PM
carson
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
1
09-02-2015 08:26 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)