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Unread 08-18-2010, 07:10 AM   #1
Yojimbo
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Need to replace the alternator and thermostat...

I need to replace the alternator and thermostat in my 92 Cherokee Laredo. Can anyone point me to any threads or links that will give me instructions and helpful tips on how to do these replacements?

I will probably be getting the alternator from Advanced Auto or AutoZone. Are there any particular brands or models that are reccomended? Which ones should I avoid?

I will probably also change my upper and lower radiator hoses as well. When I purchased the upper and lower hose I only got to larger diameter hoses. Now I see there is a smaller diameter hose attached next to the upper radiator hose on the thermostat housing. What is this hose called and what size is it?

Thanks!

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Unread 08-18-2010, 07:33 AM   #2
portcityXJ
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Both are just this:

Unbolt

Replace

Just make sure you have the t-stat facing the right way. Pay attention to the old one when you take it out for orientation.
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Unread 08-18-2010, 07:40 AM   #3
bmyohn
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Replacing you thermostat is very easy, its located at the top of the block at the front of the motor. Just about any brand from the major brand auto parts stores will do. I replaced my 210* thermostat for a 195* one and haven't had any problems. I believe the thermostat attaches with two bolts, just be sure to clean the gasket mating surface really well before re attaching it.

As for the alternator, its located on the passenger side of the block at the bottom of the engine bay. Its easily reach from below the jeep. (You may have to remove you drip shield if you still have the rubber liner from the factory.) The alternator itself is held on by three or four bolts. But to get the alternator out you will most likely have to remove the thin metal bracket that attaches to the block. To get the alternator to come all the way out you may have to loosen the belt to get the alternator out. Then just unplug it and remove the grounding wire. Should be good to go. Replacing your alternator and thermostat will most likely take a few hours, but you will learn alot doing it.

A word of advice on the alternator, buy an alternator that comes with a lifetime warranty. Since our alternators are located so low in the engine bay, they take alot of abuse from water, mud, snow, rocks, etc. So get one that you can take back and replace easily.

-Brendan
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Unread 08-18-2010, 11:10 AM   #4
Yojimbo
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Thanks for the replies!

Are there any special tools needed to do these jobs? Does anyone know what size bolts are used on the alternator and thermostat housing?
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Unread 08-18-2010, 02:20 PM   #5
CJ7-Tim
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Buy good quality parts from O'Reilly or NAPA. Advance and IdiotZone sell cheap parts. A lifetime warranty on a cheap part isn't much good if you spend the rest of your lifetime running to the parts store to exchange your now dead cheap part for another one.
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Unread 08-18-2010, 02:35 PM   #6
menace2
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Disconnect the positive battery cable before you remove the alternator. Otherwise you may be arc welding with the big wire.
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Unread 08-18-2010, 03:20 PM   #7
tangofox007
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Originally Posted by menace2 View Post
Disconnect the positive battery cable before you remove the alternator.
Disconnecting the ground cable is the "industry standard" procedure.
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Unread 08-18-2010, 03:51 PM   #8
menace2
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Originally Posted by tangofox007 View Post
Disconnecting the ground cable is the "industry standard" procedure.
Yeah, but some people don't know that. Don't want him to learn the hard way.
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Unread 08-18-2010, 03:51 PM   #9
dennis461
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battery comes out first

1991XJ here.
I've found the alternator easier to get out by removing the battery and battery tray.

Yes, unbolt wires from underneath.
But there was no way mine was coming out from under and with 6" lift.
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Unread 08-18-2010, 05:45 PM   #10
tangofox007
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Quote:
Originally Posted by menace2 View Post
Yeah, but some people don't know that.
Allow me to rephrase my previous statement:

Disconnecting the ground cable is the "industry standard" procedure.
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Unread 08-18-2010, 06:02 PM   #11
menace2
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Righto. Ground cable first gives less chance of sparking/arcing as the clamp is removed. Duh on me.
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Unread 08-18-2010, 07:20 PM   #12
Carves
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Quote:
Originally Posted by bmyohn View Post
I replaced my 210* thermostat for a 195* one and haven't had any problems.

Just out of interest ......

How did you end up with a 210' thermostat in there ???
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