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76HeavyChevy
Forum Newbie
Posts: 4
Reg: 05-09-10
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05-09-10 02:52 PM - Post#1912320
I just bought a 76 Chevy Heavy 1/2 ton, i was told that it was originally a 400 truck but now has a 350 in it, i was having problems turning at idle/ low rpm and i noticed that the power steering pulley was not lined up straight with crank, (it was routed around the fan pulley tow i dont think thats right)and even prying i cant get enough room to get enough spacers to correct this between the pump and brackets. it was originally a/c. So i guess what my question is, whats the belt routing diagram like (which belt goes on what pulley and where on the pulley, and are there any differences in the brakets, P/S pump shaft length or anything like that between the 400's and 350's appreciate any help
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 gchemist
Senior Chevytalk Moderator
Posts: 20824
Loc: Austin, TX 78748
Reg: 05-09-00
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05-09-10 04:33 PM - Post#1912362
In response to 76HeavyChevy
Welcome to the site, 76HeavyChevy.
All GM small blocks use the same brackets and pulleys. Only big blocks use a different set of brackets, but the same accessories. Can you post a picture of the alignment? It's been a while since, I've seen a V-belt system. I converted mine to a serpentine belt.
The inner crank grove goes to the A/C compressor. The middle goes to the power steering pump. The outter crank grove is for the alternator and water pump. If I'm incorrect, some here will post the correct routing.
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS |
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Anonymous
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05-09-10 05:35 PM - Post#1912387
In response to gchemist
Here's two pictures of the belts on my engine:
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Stinky
Senior Member
Posts: 1042
Loc: Whitewater, CO
Reg: 05-25-01
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05-10-10 06:24 AM - Post#1912602
In response to Bobs85PU
Well, that looks right. I have an 86 and just took it apart, so I can't look at it.
But, I can tell you that the location is correct front to rear. The alternator belt goes waterpump-crank-alt. The PS belt is the last one to come off (as in your picture) and it mounts against the block as pict-ed. Three bolts...one in the pic, one on the waterpump (I think) and one that goes on a stud that comes of a plate on the head. I have 2 grooves on the wp...alt belt and ps belt. I was thinking that the PS belt only went around one other pulley, but that must not be correct as the WP pulley (on my motor) has 2 grooves in it that are used and the crank has 3 grooves.
I've seen some HD applications that use 2 PS belts, but that has been a long time and it is overkill and not really necessary.
The 3rd pulley, on the wp is used for the airpump...which your motor is missing...it must have fallen off.
I've looked at several diff AC belts and I can tell you the '86 is an oddball year and has a mickey-mouse set-up and I don't remember how it ran right now.
Your motor is the newer style as it has valve covers w/2 bolts in the center of the cover. Older motors have two bolts on the top edge and 2 bolts on the bottom edge. Yours should be an '87 or newer. Correct me...but I do not see a mechanical fuel pump in the foto. So, somewhere you have an electric pump. And, that is another indicators that your motor is newer (you could have an old (possibly rebuilt) block w/new heads).
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Anonymous
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05-10-10 08:39 AM - Post#1912642
In response to Stinky
My truck originally came with a 305. It now has a 350 Vortec...no emission controls!!!  
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100% CHEVY
Very Senior Member
Posts: 5437
Age: 60
Loc: Helena,Missippi,U.S.A.
Reg: 12-09-04
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05-10-10 04:50 PM - Post#1912879
In response to Bobs85PU
Usually the two groove pump has one belt going to the crank pulley only and the other groove carries the belt that drives the a/c compressor.
there are at least 3 different pulleys for the power steering pumps.
One is the 2 groove shown.
Another,the single groove pulley is centered on the hub.
And the third the single groove is offset to the rear on the hub about 3/8"s.
The pulleys used depends on the year of the truck and the options on the engine.
Mike. 
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Anonymous
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05-10-10 07:09 PM - Post#1912990
In response to 100% CHEVY
My truck originally had Air, but it was removed when the 350 was installed.
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