Any write-ups on how to change alternator on 4.0? - JeepForum.com

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post #1 of 17 Old 09-19-2011, 10:13 AM Thread Starter
MountainMan864
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Any write-ups on how to change alternator on 4.0?

My alternator is about to go out, so I need to have it rebuilt. Cant find any writeups on stu olsens website or 4x4xplor. Anyone have a link or care to explain how to do it. Size wrenches needed etc. Where is the bolt tensioner and what size is it. What electrical connections need to be taken off etc. Im gonna clean my terminal posts and cables as well on my battery.

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post #2 of 17 Old 09-19-2011, 10:26 AM
roundlitefan
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I have never changed one in my Jeep...is it that different from any other alternator that it needs a write-up? Not being a smart-***, I just assumed it was bolt, bolt, plug, ground, swap, repeat, tension and tighten?
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post #3 of 17 Old 09-19-2011, 10:27 AM
mike481
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First step: DISCONNECT BATTERY

Last step: RECONNECT BATTERY

The rest I'm kind of fuzzy on.

If you want a write-up try checking the FSM

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post #4 of 17 Old 09-19-2011, 10:40 AM
mracoker
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I suggest picking up a Haynes auto guide. This is not a difficult task but the guide will give let you know what you need to do.
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post #5 of 17 Old 09-19-2011, 11:20 AM Thread Starter
MountainMan864
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Never had to change one before so its pretty new to me. Just started doing work on my jeep instead of getting ripped off at autoshops.
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post #6 of 17 Old 09-19-2011, 11:30 AM
1HouseMouse
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I haven't done it in years but, get a quality rebuilt kit. I don't know if there are any good kits anymore. As long as the alternator you are rebuilding it working, it should rebuild just fine knowing that the fields and armature is ok.
Take photos of the exterior case or mark them appropriatly before disasembly. The rest needs to come from experienced folks or an instructional book. The Post Office years back stopped rebuilding their own because of the failure rate was too high as I was told. Stay away from Auto-Bone in case you would rather circumvent the rebuild aspect. NAPA or Rock Auto on line should take care you with confidence. These new alternators that interface with computers Kinda/sorta get creepy when or if they detect something you can't test and the computer picks it up. Just some thoughts.
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post #7 of 17 Old 09-19-2011, 11:47 AM
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post #8 of 17 Old 09-19-2011, 11:52 AM Thread Starter
MountainMan864
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Eh ill pass. Im tired of putting money in this jeep. I wanna fix this alternator and try to sell it. I need a 4 door. Ill just wing it and get it done. Surprised no one had a website they could send me too.
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post #9 of 17 Old 09-19-2011, 12:03 PM
timberwolf0122
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Here's my Durango Alternator swap thread, this should help you out.
http://www.jeepforum.com/forum/f9/du...tures-1063518/

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post #10 of 17 Old 09-19-2011, 12:38 PM
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I’m not clear on what you are trying to do & why. What makes you think the alternator is ABOUT to go out? The reason I ask is that short of a bad bearing (noise) I’ve never seen an alternator give advance signs that it is about to fail. There are actually very few parts inside the alternator that can fail short of a major electrical issue that could possibly fry the field or armature windings (never seen that). All you have, really, is a set of brushes, group of diodes (rectifier), & 2 bearings.

With that said, if you do need to remove it, disconnect the battery, remove the belt, remove the 2 bolts, then the 2 wires. I think one wire unplugs, the other has a nut holding it. The belt tensioner is more or less under the alternator (4.0 engine) & is released with a ” square drive ratchet or bar inserted into the square hole. Loosen the tension by pushing the bar to the right & slide the belt off the alternator pulley, then let the tensioner back slowly until it stops. Make sure you have a diagram of the belt routing before removing it in case it comes off some of the other pulleys.
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post #11 of 17 Old 09-19-2011, 03:21 PM Thread Starter
MountainMan864
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My cd player lights kept going on and off. My headlights seemed dimmer. It was also slow to start. Maybe I just need to clean my battery terminals. The battery guage/volt meter guage was reading about on 9 and it usually reads above 14. Then after a second of the jeep running the guage would drop to 0 and my check guages light would come on. Thats why I think my alternator is going on. I took my battery to autozone and they said my battery was fine. So it can only be the alternator right?
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post #12 of 17 Old 09-19-2011, 03:26 PM
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Quote:
Originally Posted by timberwolf0122 View Post
Here's my Durango Alternator swap thread, this should help you out.
http://www.jeepforum.com/forum/f9/du...tures-1063518/
This.
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post #13 of 17 Old 09-19-2011, 03:55 PM Thread Starter
MountainMan864
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Decent write-up but ill stick to something cheaper and oem. Just gonna have my alternator rebuilt for 60 bucks instead of shelling out twice that.
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post #14 of 17 Old 09-19-2011, 05:25 PM
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You descibed two different problems in your post. Your problem with slow to start I'd think is your battery, as the alternator hasn't even come into play at this point. But, everything else you described does sound like the alternator or a poor ground. What other problems are you having that makes you want to get rid of it? Alternators go bad no big deal. You can take it off and have it checked as well. Should take you 5 minutes to get it off.
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post #15 of 17 Old 09-19-2011, 05:55 PM
mracoker
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Quote:
Originally Posted by Unlimited04 View Post
gawd no. they have just enough information to get you in trouble.

get a Factory Service Manual. if you plan to work on your jeep, you'll need one.
You are correct, I took your advice and bought a pdf version of the service manual and its way better than Haynes! How did I got this far without? I'm Glad I posted that or I would have never know

I just have to bring my laptop in the garage now and try not to get it too dirty!
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