If the gaskets come with a coating of sealant, do not use any extra.. MAKE SURE the gasket surfaces are FLAT, CLEAN (with sandpaper/machining/wire brushing..etc.. and clean with brake cleaner and then acetone... If the surfaces(head and block) are smooth, defect free and you use the proper torque sequence and settings (+10%), you should not have a problem..BUT, here is what I use..
https://www.oreillyauto.com/detail/permatex-high-tack-4590/chemicals---fluids-16461/gasket-makers--removers---sealers-16904/gasket-makers---sealers-19581/spray-a-gasket-tm-sealant/80064/4610384/1999/chevrolet/s10
or...
https://www.oreillyauto.com/detail/permatex-high-tack-4590/chemicals---fluids-16461/gasket-makers--removers---sealers-16904/gasket-makers---sealers-19581/spray-a-gasket-tm-sealant/80065/4610385/1999/chevrolet/s10?q=permatex+80065
SOURCE: 1991 jeep cherokee sport 4.0
For your 1991 Jeep Cherokee 2WD 4.0L MFI :
Foot pounds (Final torque)
Note:
Torque sequence ------------------
front | 12 8 4 1 5 9 13 |
of | |
engine | 11 7 3 2 6 10 14 |
------------------
Final torque must be reached in 3 equal steps
Step 1: torque all bolts (except bolt 11)
to 110 Ft/Lbs
Step 2: torque bolt 11 to 100 Ft/Lbs
Recheck final torque in sequence
SOURCE: head gasket sealant
liquid glass works well and there are a couple of others that work as well and the average cost is about 6.00 maybe a little more but its not expensive
SOURCE: 98 jeep grand cherokee all time 4wd, v8, 5.9L, how
u also need 2 buy intake gaskets. bcuz the intake has 2 come off 2. u need 2 take everything off thats in the way. u also hav2 drain the coolant. its a big job like 12 hrs
SOURCE: 5.2 1994 Jeep Grand Cherokee overheats at idle
I don't remember ever seeing a Jeep that did not have an electric fan as a supplement to the mechanical one. The electric one should come on when the A/C is engaged. Jeep radiators are far smaller than they should be due to ground clearance issues. The only way to make them work is to enhance air flow through them by using electric fans. (or adding an extra row of cooling cores such as in the special tow package). When the vehicle is moving there is enough air flow created by that to eliminate the need for fans altogether, but you have to stop sometime!
Your a/c compressor adds to engine loading (why it pulls rpm down) When at idle with a/c on, the engine "thinks" it's going up-hill and produces more heat. The heat needs to be scrubbed from the system or it can and will overheat.
Make sure that the clutch fan is engaging. It spins free when cold but should lock up after it gets hot. Add an electric fan to the system...check with several scrapyards and see of any Jeeps like yours have one and take it.(some electric fans are on the drivers side and some are directly in front of the mechanical one) If equipped, there is wiring for it in the car. If necessary you can add one either inside or outside the radiator and operate it by way of a switch and relay or just a switch. (there are aftermarket ones that are "slim line) and are designed to fit between the radiator and the front grille) You could also add an external transmission cooler...in doing that, it will take some of the heat load off the radiator. Also make sure that the new radiator has the same number of core rows as the old one did....some shops mistakenly put ones with less cores in when replacing due to cost. In a system with a marginal design this can become critical. (most radiators come with one two three and even four rows)
Once the problem has been solved, don't forget to put the 195 t stat back in or the engine controls won't work properly.
SOURCE: 1996 jeep cherokee miss fires and white smoke from
White
smoke is usually the sign of a blown headgasket. I would have the
coolant system pressure tested before any serious damage is done.
Keep in mind this codes:
- Black
is excessive fuel
- Blue is oil
- White is coolant
Then, if you see white
smoke from the tailpipe, you have coolant escaping into the intake
system.
Keep us updated.
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