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  #91  
Old March 27th, 2018, 08:45
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Ecomike Ecomike is offline
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Re: Going Through a Beater XJ 4.0.

What brand T-stat did you use?

The radiator may still be half full of air. You need to make sure it is full of coolant. Air in the top of the radiator has no way to escape. I always leave the upper rad hose disconnected and elevated when I fill the system. I do the same with the heater hose that goes to the T-Stat housing area on the drivers side and elevate it. that way ALL AIR is purged when filling the coolant bottle.
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  #92  
Old March 28th, 2018, 17:05
Mikep_86441 Mikep_86441 is offline
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Re: Going Through a Beater XJ 4.0.

That happened to me the very first time I flushed this jeep. Tried draining it again, and nothing came out !! With an open cooling system, a regular overflow bottle, and a petcock on the thermostat housing, it's easy to make sure it's bled now. I saw your write up about this way of filling the cooling system.
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  #93  
Old March 28th, 2018, 17:06
Mikep_86441 Mikep_86441 is offline
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Re: Going Through a Beater XJ 4.0. Radiator Exploded !!!

For real. It did!! Puked coolant 10 feet in front of the jeep while sitting still in the driveway !!

https://youtu.be/hIUle6yfrSA
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  #94  
Old March 29th, 2018, 18:12
Mikep_86441 Mikep_86441 is offline
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Re: Going Through a Beater XJ 4.0.

Couldn't get a replacement plastic tank for the passenger side of the radiator. So I lucked out and got a 2 core brass radiator with brass tanks at the junkyard. $60. Modine. The tag on it says made in usa. The local rad shop says $100 for boil and rod. He also said that the plastic tank on the passenger side gets the hottest water from the engine so that tank gets thermally beat up sooner. That's why mine died. We'll see if I can fix it to have a spare radiator.
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  #95  
Old March 30th, 2018, 11:56
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Re: Going Through a Beater XJ 4.0.

You could have bought a brand new 3 row CSF for a few dollars more.

While I am junk yard dog for some stuff, In some cases I prefer a new Chinese part over a used one.

In 12 years I never heard of a 3 row CSF all brass/metal going bad, leaking or having a problem. Not sure where they are made.

Radiators are something I do not screw with fixing, unless it is an obsolete antique one.
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Quote=8Mud: "Go ahead and put up the best fence you can build, I'll bet on some Mexican with a few dollars of nails and a pile of scrap lumber."
34 MPG , '85 2WD Cherokee Pioneer with custom installed, 64 hp, 2.2 L Nissan SD22 Diesel 5 spd Manual; & 4 Renix XJs, '87 Wagoneer 4.0, 4WD, 89-Cherokee, 4WD, '87 Cherokee 2WD, & '89 Cherokee Pioneer 2WD, all 4dr. #2091
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  #96  
Old April 1st, 2018, 16:33
Mikep_86441 Mikep_86441 is offline
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Re: Going Through a Beater XJ 4.0.

$60 more for a csf in my case.

Since I have rodded and repaired my first radiator decades ago, I prefer factory known versions because they have a known track record. Good or bad. Brass is almost eternally repairable if it's cared for even a little bit.

Plus the triple core csf may kill any clearance needed for an electric fan in the future.
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  #97  
Old April 1st, 2018, 16:35
Mikep_86441 Mikep_86441 is offline
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Re: Going Through a Beater XJ 4.0. Larger Fan Clutch Upgrade !!

Let's see how this larger fan clutch helps cooling out here in the desert. It was recommended to me by a guy in Vegas that knows the heat we go through out here south of Vegas.

https://youtu.be/usl4JlacZg4
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  #98  
Old April 10th, 2018, 20:22
Mikep_86441 Mikep_86441 is offline
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Re: Going Through a Beater XJ 4.0.

By filling the cooling system through the upper radiator hose from the t-stat housing end, there has been less trapped air in the system to purge. Thanks EcoMike for the idea !!

Load tested the cooling system today.

https://youtu.be/bY5saA18sGw
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  #99  
Old April 12th, 2018, 15:09
Mikep_86441 Mikep_86441 is offline
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Re: Going Through a Beater XJ 4.0. Torque converter lockup fixed !!

There are 2 brake pedal switches. The switch with the brown connector is for the brakes. The white switch is for the torque converter lock up and cruise control.

The white switch looks like it has threads on it that need adjusting. All I did was push the switch in until it bottomed out on the brake pedal arm. It went click, click. You can use an ohm meter to see if the switch is changing from closed to open or the other way around depending on the year of your jeep. I used the mt2500 scanner as it says weather the brake pedal is being pushed or not.

The torque converter stayed locked up all the way down to 1100 rpm. That will help with fuel economy. It works in 4th (OD) or 3rd gear. Letting all of the way off the throttle or adding a lot of throttle will unlock the torque converter. It will automatically lock up if nothing prevents it from doing so.
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  #100  
Old April 13th, 2018, 08:32
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Rob Mayercik Rob Mayercik is offline
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Re: Going Through a Beater XJ 4.0.

Interesting info on the switch for the torque converter, Mike. Since you said yours appeared to be out of adjustment, do you think this is an indication that it'd been replaced at some point and not set up correctly, or that it may have "drifted" out of adjustment?
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  #101  
Old April 16th, 2018, 05:42
Mikep_86441 Mikep_86441 is offline
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Re: Going Through a Beater XJ 4.0.

Quote:
Originally Posted by Rob Mayercik View Post
Interesting info on the switch for the torque converter, Mike. Since you said yours appeared to be out of adjustment, do you think this is an indication that it'd been replaced at some point and not set up correctly, or that it may have "drifted" out of adjustment?
Since the 'threads' on the switch were not damaged that I could see, it seems to me that the switch was just not adjusted correctly. The 2 clicks I heard were well defined, so I don't think the threads were worn. Previous owner wasn't mechanically inclined. So I doubt it was replaced.

The rpm drop at 1700 is 500 rpm. The tc will stay locked clear down to about 1100 rpm at steady throttle. That could amount to some serious fuel savings. The tc stays locked in 4th and 3rd gear. Learned a lot from the online fsm on the aw4.

On the first start in the morning, the trans won't go into reverse. So we'll see if this relates to that at all. Also found out that the trans can throw a trouble code unlike the engine computer. The mt2500 can read it. Saw that on a video from nickintime on youtube.
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  #102  
Old April 16th, 2018, 05:50
Mikep_86441 Mikep_86441 is offline
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Re: Going Through a Beater XJ 4.0.

The biggest clue I had was that the mt2500 kept showing the that the brake pedal was pressed. No it's showing it's not pressed, until I press it.

Also learned from the fsm for the aw4 how to test it mechanically only by disconnecting the trans computer. Reverse worked in the morning then. Then the entire trans only shifts manually. So the issue appears to be electronic. I'll see after several more morning tests if any of this holds true. The mt2500 really helped !!
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  #103  
Old April 16th, 2018, 12:55
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Re: Going Through a Beater XJ 4.0.

Sounds like that was PRESS-ing problem you solved.

I think (but my memory is foggy on it) that reverse is purely mechanical.

The 4 forward gears are controlled electrically (TCU) by switching 2 electric solenoid valves, 1-0, 0-1, 1-1, and 0-0 or something like that and the third electric solenoid locks and unlocks the TC. So there is no electric control for the reverse gear. I fixed my cold morning no-reverse for 2-3 minutes issues with a 1/4 pint of trans-X, and several transfusions of fresh fluid for 10 years.
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Quote=8Mud: "Go ahead and put up the best fence you can build, I'll bet on some Mexican with a few dollars of nails and a pile of scrap lumber."
34 MPG , '85 2WD Cherokee Pioneer with custom installed, 64 hp, 2.2 L Nissan SD22 Diesel 5 spd Manual; & 4 Renix XJs, '87 Wagoneer 4.0, 4WD, 89-Cherokee, 4WD, '87 Cherokee 2WD, & '89 Cherokee Pioneer 2WD, all 4dr. #2091
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  #104  
Old April 17th, 2018, 18:29
Mikep_86441 Mikep_86441 is offline
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Re: Going Through a Beater XJ 4.0.

So far just fixing the lockup switch on the brake pedal made all of the difference! Each morning it goes into reverse normally and the torque converter locks up !!
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  #105  
Old April 21st, 2018, 12:36
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Re: Going Through a Beater XJ 4.0.

Where is the Like button? LOL
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Quote=8Mud: "Go ahead and put up the best fence you can build, I'll bet on some Mexican with a few dollars of nails and a pile of scrap lumber."
34 MPG , '85 2WD Cherokee Pioneer with custom installed, 64 hp, 2.2 L Nissan SD22 Diesel 5 spd Manual; & 4 Renix XJs, '87 Wagoneer 4.0, 4WD, 89-Cherokee, 4WD, '87 Cherokee 2WD, & '89 Cherokee Pioneer 2WD, all 4dr. #2091
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