V-belt question
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Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
V-belt question
I recently got an A/C system from a truck at the junkyard. I got the 3-belt crank pully, the two belt fan pully, and all the brackets that came with it, one of which has an idler pully on it. However, the belts that were on it at the junkyard were misssing. Thus, I cannot figure out how the v-belts are supposed to be routed. If anyone that has the dealer-installed A/C on their truck could help me with this, it would be greatly appreciated. Here is a picture:
Post Fiend
Joined: Jun 2002
Posts: 13,873
Likes: 3
From: Atlanta GA
V-belt question
Since you probably want to do this ASAP
and already have the belts and from owning
and working on Ford trucks I can take
a good guess.
Put them on in this order:
crank-fan-alt
crank-fan-ps
crank-ac
I have no idea on your motor or what you got the stuff off of in the junkyard. Idler pulley says later model onto earlier model, same CID engine.
Depending on the A/C bracket and IF it shares a bolt with the PS bracket, you might not be able to adjust the A/C after the PS is tightened. So make sure the A/C belt is firm before final adjustment of the ps with the idler (AC) pulley backed off.
If your later model ps/ac bracket has a square hole, hold down the ps with a breaker bar while you tighten the power steering pivot bracket once tension is reached.
I find using a Krit-It gauge very helpful on new belts. I think you put these on at 120 (loosens to about 90 pounds after 20 minutes running).
and already have the belts and from owning
and working on Ford trucks I can take
a good guess.
Put them on in this order:
crank-fan-alt
crank-fan-ps
crank-ac
I have no idea on your motor or what you got the stuff off of in the junkyard. Idler pulley says later model onto earlier model, same CID engine.
Depending on the A/C bracket and IF it shares a bolt with the PS bracket, you might not be able to adjust the A/C after the PS is tightened. So make sure the A/C belt is firm before final adjustment of the ps with the idler (AC) pulley backed off.
If your later model ps/ac bracket has a square hole, hold down the ps with a breaker bar while you tighten the power steering pivot bracket once tension is reached.
I find using a Krit-It gauge very helpful on new belts. I think you put these on at 120 (loosens to about 90 pounds after 20 minutes running).
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Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
V-belt question
It's an FE 360. Year is 1970. Same one as in my sig. I got the A/C off a 1969 F-100 with a 360. All the other A/C systems at the yard were on 400M's with the wrong brackets. Rebocardo, your solution sounds good, execpt that the A/C belt will interfere with the fan pully. Also, the idler is groved, like a standard pully. Where does it fit into the system?
Edit: This is a dealer installed under-dash type system.
Edit: This is a dealer installed under-dash type system.
Last edited by rusty70f100; May 16, 2003 at 06:26 PM.
Thread Starter
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Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
V-belt question
Those are actually somewhat useful. I can see that the AC uses the idler. Why, I dont know, but it does. Maybe. Hard to tell from those pics. If you still have those trucks, or still have access to them, I would be eternally grateful for some more pics, or if you could just look at it and tell me how it works.
What I cant figure out is how the AC belt is supposed to get back to the crank. Any ideas?
What I cant figure out is how the AC belt is supposed to get back to the crank. Any ideas?
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Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
V-belt question
Ok, I got it working. One belt goes from the crank to the alternator, the other goes from, get this, the crank, to the fan, to the A/C, to the power steering, and back to the crank. I used a spacer behind the fan pully to get it where it needed to be. The idler is not used. It seems to work good like this. Thanks for the help everyone! Still, if anyone finds out how it is SUPPOSED to work, let me know.
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Laughing Gas
Joined: Oct 1999
Posts: 1,165
Likes: 3
From: central Alberta
V-belt question
That's interesting. Looks from the pictures that it should be:
-crank, fan, alt
-crank, fan, a/c, idler
-crank, p/s
So the idler wasn't on the same plane as the a/c?
-crank, fan, alt
-crank, fan, a/c, idler
-crank, p/s
So the idler wasn't on the same plane as the a/c?
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Thread Starter
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Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
V-belt question
It is, but it gets in the way of the power steering. The power steering is on the same plane as the idler. I cant run two things on the same idler. Actually, if it wasn't there, it would be a lot easier.
Laughing Gas
Joined: Oct 1999
Posts: 1,165
Likes: 3
From: central Alberta
V-belt question
Curiouser and curiouser... Did you take the pump, too, or just the bracket? Which groove on the crank pulley is now vacant- the one closest to the engine? Wonder if a shorter p/s pump was used in this application...
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Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
V-belt question
I just took the bracket. The middle pully on the crank is vacant. Maybe they did. I dunno. I'm not gonna make another run up to the junkyard to find out. It works great the way I got it. Might not be right, but it works. 
Junior User
Joined: Feb 2003
Posts: 70
Likes: 0
V-belt question
My truck is a 70 with 390 and a similar a/c setup. There is a 2 groove pulley on the crank and an add-on (I assume a/c kit) 1 groove pulley bolted on. The belt colsest to the engine goes crank - fan - alternator. The next on forward goes crank - PS and the add-on pulley goes crank - idler - A/C. This A/C is definitely an add-on kit (made by ARA). The compressor bracket bolts on where the top alt bracket meet the water pump and relocates that alt mount point to a new hole in the compressor bracket. It is also mounted by vertical slots that fit over the upper P/S bracket bolt (the ones that mount to the water pump) and a new bolt in the driver side cyl. head ( in existing hole).
It sounds like your compressor bracket may be sitting too far aft in conjunction with the P/S bracket being too far forward. That P/S bracket is way too complicated, but by chance did the spacers that fit on the aft side of the pump bracket and forward side of the stabilizer bracket ( the on that has 2 bolts in the front and one bolt to the block) get put on wrong side?
It sounds like your compressor bracket may be sitting too far aft in conjunction with the P/S bracket being too far forward. That P/S bracket is way too complicated, but by chance did the spacers that fit on the aft side of the pump bracket and forward side of the stabilizer bracket ( the on that has 2 bolts in the front and one bolt to the block) get put on wrong side?
Logistics Pro
Joined: Feb 2000
Posts: 3,565
Likes: 9
From: Sun River St. George
V-belt question
Ford brackets, pullies and idlers will drive you nuts! I have a similiar setup on my old bug and it closley matches what 70FordGuy has and I believe that is correct. Depending on where the idler sits you may not need a dual V water pump pully. Patience is the operative word here. Use spacers and plenty of patience to line up the belts. I believe it should be crank, pump, alt, then crank, PS and finally crank, idler (the adjustment) and AC.