I have 180k miles on the veggie Jeep and I was thinking I want to install head studs, and basically give it a really good tune up. I needs new antifreeze, and timing belt is due at 200k miles. Could probably use a differential fluid change and transfluid change.

Question is if I do everything now or 185k or 190k will the timing belt make it to 300k miles. I would really like it to go 300k miles before I consider something else. Should I just wait until 200k miles and then do everything.

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2006 Liberty CRD -- Spare tire replaced with Veg tank, semi filter for veg, FPHE, Electric common rail line heater, fill vegetable oil tank every 3 days. ORM, EHM comes out in front of the passenger rear tire. Wife has new job and 20 mile round trip to work. I borrow her Jeep a lot and live in South Florida.

When was the first timing belt changed (date and mileage) at least I assume the belt has been changed at least once as it's more than extremely unlikely that you have made it to 180,000 miles on the original belt. If you have it's much much more than a miracle and you need to park the vehicle until the TB job is done.

The factory TB change interval is 100,000 miles although I and several others think it really should be 100,000 miles or ca. 6 years whichever comes first (in my case my TB was done at 49,375 miles and 8 years (belt was ok but "hard" compared to new belt) so your next TB job needs to be 100,000 miles or 6 years which ever comes first, after the last one. There is no way the TB will make it to 300,000 miles (perhaps the "3" is a typo and you meant "2") unless you just replaced it in which case the interval would be the difference between 180,000 and 300,000 or 120,000 miles which you might make but I wouldn't bet your rockers on that.

Antifreeze and tranny/driveline fluids you can do now or wait depending on when they were last done. Antifreeze is probably good for 100,000 miles but frankly I favor 50,000 mile intervals for all those fluids just because fluids are cheap and parts are not. That said on the TB job I'd do all the idler pulleys, TB tensioner, and the water pump so you may want to hold off on antifreeze until you do the TB job as you will lose a good bit of antifreeze, unless you drain and recycle, when you do the water pump front half. I'd do the head studs when you do the TB as you have to pull the TB to get in that far.

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs

It is due for its third timing belt at 200k miles. The second one went in middle of 2011 at 99k miles. Others wise you got my thinking the 5 year antifreeze is only 3 years old and I will have to change it while doing the TB and all the parts that go with it. I might wait until I get to 190-195k miles then change all the parts and see if I make it to 300k miles before I need to do the timing belt again, with all its associated parts.

Is he implying that I need to check the rockers while I am in there doing the timing belt and head bolts? And that they are already worn out?

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2006 Liberty CRD -- Spare tire replaced with Veg tank, semi filter for veg, FPHE, Electric common rail line heater, fill vegetable oil tank every 3 days. ORM, EHM comes out in front of the passenger rear tire. Wife has new job and 20 mile round trip to work. I borrow her Jeep a lot and live in South Florida.

Ok last TB was in 2011 (only 3 years ago) at 99,000 miles and you are currently at 180,000 so in 3 years you have driven 80,000 miles or ca. 27,000 miles per year so you should hit 200,000 roughly next summer. My thoughts:
1. do the drive line fluids (transmission, transfer case, differential and such) now if they have not been done in the last 50,000 miles or so otherwise wait until 200,000
2. if your 5 year antifreeze is only 3 years old wait until 200,000
3. do the TB at 200,000 and be sure to toss on new idler pulleys and a new TB tensioner and a new water pump front half. I like to do serpentine belts every 50,000 so do that at the same time and be sure to inspect the idler belt pulleys for leaking grease and replace is need be; this includes the idler on the serp belt tensioner which is the same size as the other 2. Tstat can wait if your temp gauge rides at the proper point.

If you plan on doing ARP studs as part of the job then you can certainly inspect the rockers and lifters (aka lash adjusters). If the rocker rollers are good (no slop or scoring) then there is no need to replace them but if there are problems you can get a new set from idparts quickly, I would not replace them just because.

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs