Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here! ZJ (93-98), WJ (99-04), WK (05+)
All ZJ/WJ/WK specific tech questions asked here!

4.0L Piston Ring Clocking?

Thread Tools
 
Search this Thread
 
Old Oct 23, 2016 | 04:21 PM
  #1  
99Justin4.0's Avatar
Thread Starter
Member
 
Joined: Sep 2016
Posts: 133
Likes: 0
From: Tacoma, WA
Year: 1999
Engine: 4.0L
Default 4.0L Piston Ring Clocking?

Does anyone know the actual Jeep suggested Piston Ring Clocking?

I'm just looking for some last minute tips before they go in. I've got them pretty good as far as I think. Should the Top Rings really be 180 degrees from each other? Maybe someone has a link to a diagram or something.

I'm about ready to start poppin them in.
Reply
Old Oct 24, 2016 | 09:25 AM
  #2  
jon-d's Avatar
Senior Member
 
Joined: Mar 2016
Posts: 707
Likes: 20
From: AV Kalifornia
Year: 1996
Model: Grand Cherokee
Engine: 4.0
Default

yes, the gap from the first ring to the next should be 180 degrees apart from each other. I don't think the starting position is that important but for myself I would place them front to back since the rod rotates between the left and right side direction.
Reply
Old Oct 24, 2016 | 09:37 AM
  #3  
jon-d's Avatar
Senior Member
 
Joined: Mar 2016
Posts: 707
Likes: 20
From: AV Kalifornia
Year: 1996
Model: Grand Cherokee
Engine: 4.0
Default

don't forget the rings are different, the top ring has a dot on the top it and the bottom ring has a chamfer on the bottom inside edge. you should also place the second compression ring gap 180 from the oil ring gap as well.

Reply
Old Oct 24, 2016 | 10:01 AM
  #4  
dave1123's Avatar
Old fart with a wrench
 
Joined: Nov 2010
Posts: 14,398
Likes: 740
From: Manlius, east of Syracuse, NY
Year: 2000 XJ Sport & WJ Laredo
Model: Grand Cherokee (WJ)
Engine: 4.0L
Default

I'd like to add the reason of that notch in the second ring is to allow the ring to twist when being driven down under combustion pressure and seal better against the cylinder wall.
Reply

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 



All times are GMT -5. The time now is 12:52 PM.