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XJ Ask the Question Thread
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Join Date: Dec 2012
Location: North Ga.
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Year: 1994
Model: Cherokee
Engine: 4.0
Fan Clutch
Same here with the Napa fan clutch. I believe it to be a rebranded Hayden but don't quote me on that. I was thinking of getting the heavy duty one they sell but my friend said unless I am having some problems with my cooling and since I don't tow don't. He said my gas mileage would tank and it would be louder. He is good with mechanical stuff so I just usually do what he suggests and leave it at that.
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Year: 1998
Model: Grand Cherokee (ZJ)
Engine: 5.2
Can you do valve seals on the bench or has to be on the engine.
Had a shop tell me because the valves don't spin on a Jeep its a lot more work.
Had a shop tell me because the valves don't spin on a Jeep its a lot more work.
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Year: 1998
Model: Cherokee(XJ)
Engine: 4.0L
They can be replaced with the head on the block. It is a pain but pretty simple. You have to crank the engine by hand till its at the right spot for each cylinder when the valves are closed. Then you need to have/make an adapter for an air line to attatch to that screws in the spark plug hole to keep the cylinder pressurized so the valve dont drop. some people will shove a bunch of thin rope in the cylinder so if the valve does drop it wont be out of reach. then you take off the rocker and replace the seals. they make tools to compress the valve spring
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Year: 1998
Model: Grand Cherokee (ZJ)
Engine: 5.2
The valves dont spin? I don't know what that means but I am not a 4.0 expert. But saying "jeep" is a pretty broad term Jeep has made alot of different engines
They can be replaced with the head on the block. It is a pain but pretty simple. You have to crank the engine by hand till its at the right spot for each cylinder when the valves are closed. Then you need to have/make an adapter for an air line to attatch to that screws in the spark plug hole to keep the cylinder pressurized so the valve dont drop. some people will shove a bunch of thin rope in the cylinder so if the valve does drop it wont be out of reach. then you take off the rocker and replace the seals. they make tools to compress the valve spring
They can be replaced with the head on the block. It is a pain but pretty simple. You have to crank the engine by hand till its at the right spot for each cylinder when the valves are closed. Then you need to have/make an adapter for an air line to attatch to that screws in the spark plug hole to keep the cylinder pressurized so the valve dont drop. some people will shove a bunch of thin rope in the cylinder so if the valve does drop it wont be out of reach. then you take off the rocker and replace the seals. they make tools to compress the valve spring
No, I don't lick fish.
I have seen this and questioned this too. What I think is there may be a "technicality" when using the term "new". "Like new refurbished" is being wrongly applied as "new" instead of using the term "rebuilt". So I would bet it is actually a Mopar casting that has been re-machined and "like new". These are the little tricks they pull that pisses me off with these parts stores. lol
If you do remove the head, make sure you have a good torque wrench and have the torque sequence chart handy. Torque sequence MUST be used for both REMOVAL and INSTALLATION to avoid breaking a head stud.
If I were you, I'd just do them with the head attached to the motor. It's much less involved and only takes an hour... two hours tops.
The valves dont spin? I don't know what that means but I am not a 4.0 expert. But saying "jeep" is a pretty broad term Jeep has made alot of different engines
They can be replaced with the head on the block. It is a pain but pretty simple. You have to crank the engine by hand till its at the right spot for each cylinder when the valves are closed. Then you need to have/make an adapter for an air line to attatch to that screws in the spark plug hole to keep the cylinder pressurized so the valve dont drop. some people will shove a bunch of thin rope in the cylinder so if the valve does drop it wont be out of reach. then you take off the rocker and replace the seals. they make tools to compress the valve spring
They can be replaced with the head on the block. It is a pain but pretty simple. You have to crank the engine by hand till its at the right spot for each cylinder when the valves are closed. Then you need to have/make an adapter for an air line to attatch to that screws in the spark plug hole to keep the cylinder pressurized so the valve dont drop. some people will shove a bunch of thin rope in the cylinder so if the valve does drop it wont be out of reach. then you take off the rocker and replace the seals. they make tools to compress the valve spring
When I did mine, there was a good deal of carbon buildup that was keeping the valvestem from wanting to separate from the keepers and rockers. A good whack from a ballpeen hammer to the top of your tool will give it just enough vibration to loosen everything up and come loose for you.
Don't forget to torque the rockers back to spec with proper pre-load on the valves.
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Year: 1998
Model: Grand Cherokee (ZJ)
Engine: 5.2
Lol head is off and nothing crazy or difficult and at the shop. If they give it a clean bill of health valve stem seals will most likely be done.
Was looking for feedback.
Was looking for feedback.
No, I don't lick fish.
CF Veteran
Quick question does anyone elses jeep drive differently on random days? Like yesterday my jeep felt like a dog and was kinda slow but today it felt very peppy and quick today.
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Year: 97
Model: Cherokee
Engine: 4.0
The rope trick works well, I have been using this for years now. Just shove it in until you ball up a handfull in the chamber on the compression stroke then rotate the engine over until the piston comes up against the rope and valves. Then back the rotation up a bit to pull the rope back out after you have that cylinder done and go to the next.
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Year: 2000
Model: Cherokee (XJ)
I was curious since '97 and up XJ's don't have a heater control valve like '96 and down does the coolant always circulate through the heater core when the heat is completely off?
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Yes. The heat on all XJs is actually controlled by a blend air door. Vacuum actuated through 96, electronically actuated 97 and later.
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Year: 2000
Model: Cherokee (XJ)
Thanks that is what I thought. Despite that even in the warmer months I would turn on the heat for a bit. Always kinda figured coolant just sitting in a heater core, for longer periods of time, and not circulating is not the best thing
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Year: 1999
Engine: 4.0
Originally Posted by Ralph77
I was curious since '97 and up XJ's don't have a heater control valve like '96 and down does the coolant always circulate through the heater core when the heat is completely off?