3G issue
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Fleet Mechanic
Joined: Nov 2009
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3G issue
I did the 3G swap. Love the concept, but I have been having a squealing belt issue, ever since. The belt is lined up. I went to an AX42 belt in the hopes of filling up the pulley, but the squeal still exists. My first PNP alternator went by the wayside. I bought a rebuilt one and the squeal is there. Any tips before I decide to re-invent the wheel?
Fleet Owner
Joined: Dec 2009
Posts: 20,678
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From: NorCal
I suggest scuffing/cleaning the pulley grooves with a coarse Scotchbrite pad and re-tensioning the belt.
The belt should ride in the groove rather than on top of it. Ideally, it should sit no higher than the pulley's outer circumference.
The belt should ride in the groove rather than on top of it. Ideally, it should sit no higher than the pulley's outer circumference.
Logistics Pro
Joined: Feb 2000
Posts: 3,955
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From: Mesa
An old shade tree trick is to rub the belt with a bar of soap. I remember doing that to my belts back in the day and it worked. 
The single belt is really good for about 120A or so. If you're pulling a lot of amps that could be an issue.
The single belt is really good for about 120A or so. If you're pulling a lot of amps that could be an issue.
Elder User
Joined: May 2004
Posts: 836
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From: Shreveport, LA
He already mentioned the belt alignment is OK and the alternator wont squeal from load unless there is a pretty significant load on it; like charging a very low battery or running something that creates a serious draw.
Just go serpentine and be done with it.
Just go serpentine and be done with it.
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Fleet Mechanic
Joined: Nov 2009
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What is needed for this? Also, what models had the 2 pulley alternators?
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Senior User
Joined: Jul 2011
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From: North West
Oops sorry I missed that
84espy how did you check the alignment? String, straight edge, visual or laser alignment?
I agree with the dual belts or serpentine belt
84espy how did you check the alignment? String, straight edge, visual or laser alignment?
I agree with the dual belts or serpentine belt
Elder User
Joined: May 2004
Posts: 836
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From: Shreveport, LA
You can buy two grove pulleys online. I had one, but I never got around to having a crank pulley with two of the same size grooves on it. Rjm Injection gsm them, I think, but I got mine from Napa.
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Fleet Mechanic
Joined: Nov 2009
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Also, if I go double pulley, wouldn't I have to change the water pump pulley?
Elder User
Joined: May 2004
Posts: 836
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From: Shreveport, LA
I didnt change mine. I never RAN the second belt I put on, but I did fit it up. That was about the time I noticed that my crank pulley wouldnt work with it.
This was on a 400, though. I'm not sure on anything else.
Some pages online have measurements, so you could figure it out before buying, or maybe even mock something up.
This was on a 400, though. I'm not sure on anything else.
Some pages online have measurements, so you could figure it out before buying, or maybe even mock something up.
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Fleet Mechanic
Joined: Nov 2009
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So I went to PNP for some more ideas on this pulley business. I found a double pulley alternator in a Bronco. The crank pulley was there and it looked like both pulley grooves were the same size. The other thing I noticed was that the alternator pulley was not wrapped around the water pump. Mine is. Is mine configured wrong? Is there enough turn from the power steering pump/crank to operate the water pump with no ill affects? I also found an idler pulley that I'm going to tinker with.
Lots of bullnose there. Not too many dents or bumps, though.
Lots of bullnose there. Not too many dents or bumps, though.