Water pump pulley for '72 AC car question - Chevelle Tech
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post #1 of 10 (permalink) Old Nov 3rd, 19, 9:45 PM Thread Starter
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Steve
 
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Water pump pulley for '72 AC car question

So, I have determined that as far as I can tell the PO of my car installed the AC brackets and belts and routed everything wrong, but I didn't realize it until mapping things out to prepare to pull the engine.

I was looking at the 1972 Chevelle Assembly manual. It shows that for a 1972 AC car, based on the belt routing, I should have a 3 groove crank pulley, 1 groove water pump pulley, 1 groove alternator pulley, 1 groove AC pulley, and 2 groove PS pump pulley. It shows that the alternator belt goes on the front most groove of the crank, around the water pump and around the alternator. The next belt is then supposed to be the middle groove of the crank pulley, goes around the crank and front groove of the PS pump only. The next belt is supposed to be the back groove of the crank pulley and go around the crank, rear groove of the PS pump and the AC compressor.

On my car currently the PO shimmed out with a spacer the AC compressor and has it using the belt on the middle crank groove and also going around the water pump and PS pump using a 2 groove water pump pulley, and the PS pump belt is on the rear groove of the crank. He also installed the front AC compressor bracket upside down and removed the rear AC compressor bracket. The alternator belt is in the right place.

My question is around the water pump pulley. If the assembly manual is correct, I should only have a single groove water pump pulley. But, I see a 2 groove water pump pulley called for with AC cars all over the place on websites and retailers. Why would that be? Anyone have any ideas here and maybe shed some light on what it really should be?

1972 Chevelle, 454, 200-4r non-lockup, 12 bolt 3.73
1981 Camaro Z28, 355, TH350, 3.73
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post #2 of 10 (permalink) Old Nov 4th, 19, 12:21 PM
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Bob
 
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Re: Water pump pulley for '72 AC car question

This may or may not help: My one owner 70 LS-5 has Factory A/C. I believe a 71/72 with air, The pulleys should be very close to a 70 B.B. except the compressor mounting brkts. Here is whats on both of my 70s with Org. G.M. ( A/C) pulleys.
The crank pulley is a 3 G-----3937787AC
Water pump-------- 1 G-----3976059AO
P.S. pump--------- 2 G.
Alt.---------------- 1 G.
71/72 May have different part #s, The configuration should be the same or real close. We need a 71/71 A/C car guy to jump in here with some pulley numbers.
Bob
Some folks have told me,,,,, Some " REPO" pulleys may, I said MAY,, Fracture and fly apart? Use Caution!
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post #3 of 10 (permalink) Old Nov 4th, 19, 12:35 PM Thread Starter
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Steve
 
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Re: Water pump pulley for '72 AC car question

Thanks for the info, this is great.

Can you confirm which crank pulley groove the AC compressor belt is in?

Quote:
Originally Posted by Robinls5 View Post
This may or may not help: My one owner 70 LS-5 has Factory A/C. I believe a 71/72 with air, The pulleys should be very close to a 70 B.B. except the compressor mounting brkts. Here is whats on both of my 70s with Org. G.M. ( A/C) pulleys.
The crank pulley is a 3 G-----3937787AC
Water pump-------- 1 G-----3976059AO
P.S. pump--------- 2 G.e
Alt.---------------- 1 G.
71/72 May have different part #s, The configuration should be the same or real close. We need a 71/71 A/C car guy to jump in here with some pulley numbers.
Bob
Some folks have told me,,,,, Some " REPO" pulleys may, I said MAY,, Fracture and fly apart? Use Caution!

1972 Chevelle, 454, 200-4r non-lockup, 12 bolt 3.73
1981 Camaro Z28, 355, TH350, 3.73
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post #4 of 10 (permalink) Old Nov 4th, 19, 9:38 PM
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Bob
 
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Re: Water pump pulley for '72 AC car question

The belt positions on both of my 70s with factory C/60:
Front............... Alt. & W. Pump
Middle............. P. Steering
Rear................ A/C belt.
NOTE: If you are NOT using the O.E.M. type 811 water pump, You may be using a new style pump. Watz the difference??? The 811s have NO iron gussets cast into the pump housing. SOME later model water pumps DO have gussets cast into them and you MAY find your A/C belt may hit or rub the new style pump??????
The belt number for the Crank to the A/6 Compressor is 9433766 GY = Goodyear.
330 X 5700.
Bob


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1970 ( FRAUD) SS 468 Station Wagon - Driver.
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post #5 of 10 (permalink) Old Nov 4th, 19, 9:57 PM Thread Starter
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Steve
 
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Re: Water pump pulley for '72 AC car question

Great, thank you!

Quote:
Originally Posted by Robinls5 View Post
The belt positions on both of my 70s with factory C/60:
Front............... Alt. & W. Pump
Middle............. P. Steering
Rear................ A/C belt.
NOTE: If you are NOT using the O.E.M. type 811 water pump, You may be using a new style pump. Watz the difference??? The 811s have NO iron gussets cast into the pump housing. SOME later model water pumps DO have gussets cast into them and you MAY find your A/C belt may hit or rub the new style pump??????
The belt number for the Crank to the A/6 Compressor is 9433766 GY = Goodyear.
330 X 5700.
Bob

1972 Chevelle, 454, 200-4r non-lockup, 12 bolt 3.73
1981 Camaro Z28, 355, TH350, 3.73
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post #6 of 10 (permalink) Old Nov 5th, 19, 2:07 PM
Marco
 
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Re: Water pump pulley for '72 AC car question

I have a 72 skylark 350 with factory AC.

I have that same set up.

Three groove pulley.

AC - last
Steering Pump-middle
Alt- front

I just changed my belts so I can get you belt numbers and pics if you need.
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post #7 of 10 (permalink) Old Nov 5th, 19, 2:13 PM Thread Starter
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Steve
 
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Re: Water pump pulley for '72 AC car question

Pics are always cool. . I suspect the belts are different lengths though, plus I can get the factory lengths from Rockauto - they just don't have the routing pictures. Thanks!

Quote:
Originally Posted by mromaus View Post
I have a 72 skylark 350 with factory AC.

I have that same set up.

Three groove pulley.

AC - last
Steering Pump-middle
Alt- front

I just changed my belts so I can get you belt numbers and pics if you need.

1972 Chevelle, 454, 200-4r non-lockup, 12 bolt 3.73
1981 Camaro Z28, 355, TH350, 3.73
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post #8 of 10 (permalink) Old Nov 5th, 19, 5:24 PM
Marco
 
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Re: Water pump pulley for '72 AC car question

I hope this is helpful. I tried to get as many angles as I could.

I just put those belts on, the previous owner said the A/C works.

I tried to turn it on and it seems to lock up, I understand it is good to have low expectation for these old units.
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post #9 of 10 (permalink) Old Nov 5th, 19, 11:45 PM
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Re: Water pump pulley for '72 AC car question

A chevy has the a/c compressor on the other side and the A/C belt is the inside belt!!
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Leo Paugh
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progress has little to do with speed, but lots to do with direction

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post #10 of 10 (permalink) Old Nov 6th, 19, 9:15 PM
Marco
 
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Re: Water pump pulley for '72 AC car question

Interestingly, mine is on the second.

Sorry, my mistake. To think, I was just out there over the weekend replacing those belts.

It's also interesting how my setup is different than a Chevelle 350. You put the two cars next to each other and they are nearly identical.
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