Should I replace the timing chain? - JeepForum.com
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Unread 10-17-2013, 07:12 PM   #1
congerz83
Registered User
1996 ZJ 
 
Join Date: Jun 2011
Location: Congers, NY
Posts: 348
Should I replace the timing chain?

96 4.0

I'm doing my water pump... Noticed a LOT of sludge on the outside of the timing cover. Took it off and cleaned it. A couple of questions...

1) Is the cam seal this little rubber seal INSIDE the cover?

2) I have 185K... Should I just replace the chain as long as it's already open?

3) If I do replace, there's no need for this "double roller" chain, right?

I've got a new chain, timing cover, gasket set and "tensioner" waiting in my RockAuto basket $96 delivered to the house... Should this be a go?
Say the word, and I'll press "CHECKOUT"

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Unread 10-17-2013, 10:44 PM   #2
SLOspeed
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1996 ZJ 
 
Join Date: Mar 2013
Location: Oakland, CA
Posts: 60
Replace it with a double roller or don't bother. The stock chains stretch out quick. You'd find that a new OEM chain would be just as sloppy and loose as what you have now in no time. My dad just found this out the hard way: He had to replace the timing cover gasket on his new motor with only a few thousand on it, and the OEM replacement chain was UNBELIEVABLY sloppy.
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Unread 10-18-2013, 08:49 AM   #3
zjosh93
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1993 ZJ 
 
Join Date: Aug 2010
Location: Austin
Posts: 1,298
My OEM chain had 240000 miles when I replaced it and it was just a hair too loose. I would expect a stock replacement to last just as long. Remember that on the 4.0 the tensioner is in the cover so the chain always looks loose when you look at it.

I've seen some epic roller vs non-roller discussions on other boards but it's really a personal preference kind of thing. I put a double roller in mine just because it wasn't much more and they do tend to last a little longer.
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Unread 10-18-2013, 10:33 AM   #4
congerz83
Registered User
1996 ZJ 
 
Join Date: Jun 2011
Location: Congers, NY
Posts: 348
Should I replace the gears as well?
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Unread 10-18-2013, 10:46 AM   #5
zjosh93
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1993 ZJ 
 
Join Date: Aug 2010
Location: Austin
Posts: 1,298
Always replace them as a set, chain and two sprockets.
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