I've searched both using the search function and manually without finding a answer so I will ask here.

I have 84,000 miles on my gas 3.7 2002 KJ. Is it time to change the timing belt? - Thanks.

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2004 TJ Rubicon.

I don't have the manual with me but I'm pretty sure it says to do it at 60,000.

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'04 Liberty Limited - 245/70/16 Firestone Destination AT's, Mopar tow hooks, Draw-Tite Class IV hitch, Skid Row Engine & Transmission Skids, Mopar T-Case & Gas Tank Skids, Extended Breather Tubes, Red Top Optima, Sylvania Silver Star head lights, Hella 500FF bumper mounted driving lights

There is no timing belt. There are chains.

I haven't taken one apart; I hear it is complex.

There is a primary chain driven from the crankshaft to an idler shaft, which in turn drives the overhead camshaft in each head with a secondary chain, and a counterbalance shaft.

I hate timing belts.

Thanks, good to know.

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2004 TJ Rubicon.

Yep, 3.7 has a chain

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LOST # 633
'05 KJ 3.7L/6spd/241 245/75/16 MT's
'88 MJ 4.0L/AW4/231 SWB HPD30 & trac-loc D44 w/3.73's
A dirty Jeep is a happy Jeep

So has anyone done one?

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"I'm the guy who does his job, you must be the other guy"
02 Black UNlimited Edition 4X4 Select Trac Liberty Towing/Off Road Packages 245/75/16 on black Moabs
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L.O.S.T. Member 2877

I checked my owners manual and the service manual. The owners manual says to replace the Drive Belt at 45,000 miles, which is the serpentine belt on the front of the engine that connects the water pump, power steering pump and everything else up there. A timing belt is only found on the diesel KJs.

If this is what you are talking about, then this is a very simple job.

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2006 KJ Sport, Dark Khaki, 3.7 Litre
NSG370 6 Speed Manual Transmission | NP241J Command Trac HD Part Time 4wd | 3.55s | 245/70R16 Firestone Destination A/Ts | Mopar Tow Hooks & Skids | Powerslot Brake Rotors | ARB Rear Differential Cover

CRDs are not the only KJs to have a timing belt...the 2.4L KJs also have one.


I wouldn't bother replacing a t-chain until it started making noise.

IIRC book time is 3.5 hours.

Which is a far cry from the 11.7 hours that it wants to replace all 4 timing chains in an OHC Ford 4.0

I typically change timing chains between 180,000 - 200,000 on any vehicle I own. I figure by then they are ready to be changed. I’ve never had one go bad on me.

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2015 Ram Ecodiesel/Big Horn/4x4/Quad Cab
2016 Arctic Fox 22G/Onboard 2500 LP Cummins Onan Generator/160 Watt Solar Panel

I took the road less traveled. Now I'm LOST.

The 3.7 and 4.7 use 3 timing chains.The plastic tensioners will wearout way before they will and the tensioners ussually have been lasting 175,000-200,000 miles so far on 4.7's.

I’ve heard that dirty oil can wear out chains faster. Make sure you use good oil, change oil as recommended, and always use the best filter medias.

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2015 Ram Ecodiesel/Big Horn/4x4/Quad Cab
2016 Arctic Fox 22G/Onboard 2500 LP Cummins Onan Generator/160 Watt Solar Panel

I took the road less traveled. Now I'm LOST.