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Old 04-22-2009, 06:21 PM   #1
8door
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4 groove crankshaft pulley

Is there such a thing? I am adding a/c to a 350 V8 and it now has a 3 groove crank pulley, but the third position, counting away from the harmonic balancer, has a space between 1st and 2nd grooves,see attached photo.
I'm thinking the components I have are off a smog pump motor that only had power steering.
A 3 groove will fit and line up with the water pump pulley, which will be changed to a 2 groove. And then line up with a/c compressor and alternator, but the 3rd groove won't be in line for the power steering pump.
Could it be a different pulley is needed for the power steering?
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Old 04-22-2009, 07:00 PM   #2
Green Machine
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Re: 4 groove crankshaft pulley

The cast iron pulley is available with 2 grooves, giving 4 total with the double steel pulley. I have one on the 68 if you need a pic.
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Old 04-22-2009, 07:35 PM   #3
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Re: 4 groove crankshaft pulley

Dang, can't edit, have that backwards, you can get a steel pulley for the crank with 2 grooves and add the cast iron one for a total of 4, our 68 had a smog pump at one time so the water pump and crank pulley are double. We added the cast iron pulley to get power steering.
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1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894
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Old 04-22-2009, 08:07 PM   #4
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Re: 4 groove crankshaft pulley

I have a 3 grove pulley and it runs AC and PS....... I am pretty sure it goes like this.

Back one goes Crank, PS
Middle one Crank, Water Pump
Front one- Crank, Water Pump, AC

I could be off on which is which. But, I know it does do AC and PS with only a 3 grove pulley.
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Old 04-22-2009, 11:06 PM   #5
8door
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Re: 4 groove crankshaft pulley

Quote:
Originally Posted by Green Machine View Post
Dang, can't edit, have that backwards, you can get a steel pulley for the crank with 2 grooves and add the cast iron one for a total of 4, our 68 had a smog pump at one time so the water pump and crank pulley are double. We added the cast iron pulley to get power steering.
That makes sense. So I will only need to buy a 2 groove water pump pulley and 2 groove crank pulley. Then there will be one grove left over.
1 Water pump, alt
2 A/C
3 blank
4 Power steering
Got a picture of yours?
By the way I like your red 68, that is what I'm going for, is a stock look.
Here is what I've done so farNeeds little more work
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Old 04-22-2009, 11:58 PM   #6
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Re: 4 groove crankshaft pulley

Quote:
Originally Posted by Sinisterspeed View Post
I have a 3 grove pulley and it runs AC and PS....... I am pretty sure it goes like this.

Back one goes Crank, PS
Middle one Crank, Water Pump
Front one- Crank, Water Pump, AC

I could be off on which is which. But, I know it does do AC and PS with only a 3 grove pulley.
No alternator/ generator?
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Old 04-23-2009, 12:16 AM   #7
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Re: 4 groove crankshaft pulley

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Originally Posted by westofb View Post
No alternator/ generator?
Ya I noticed that also, but the alt/gen does runs off the water pump so it takes 3 grooves, I finally figured it out.
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Old 04-23-2009, 10:09 AM   #8
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Re: 4 groove crankshaft pulley

yeah. i knew I was missing something. LOL.. but. I also knew that you didn't need 4 grooves to run ac.

I am pretty sure that the middle groove runs the Alt also.

If the paint shop hasn't had my truck for 10 friggin months. I might have been able to just look.. LOL
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Old 04-23-2009, 10:17 AM   #9
BluTrukker
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Re: 4 groove crankshaft pulley

I'm not 100% sure if it is the same on civilian trucks, but the military hummers with the old 6.2 or 6.5 have a steel 4 groove pulley that should work.
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Old 04-23-2009, 02:36 PM   #10
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Re: 4 groove crankshaft pulley

Here's a couple of pics for reference, and thanks for the complements on the 68 !
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1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103
1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285
1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894
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Old 04-23-2009, 03:26 PM   #11
8door
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Re: 4 groove crankshaft pulley

Greenmachine, that's perfect just what I needed to know. I have everything ready to go to get mine on the road, well almost just a few more things, paint, upholstery tires things like that.
Thanks
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Old 05-04-2009, 08:49 PM   #12
8door
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Re: 4 groove crankshaft pulley

This what I'm looking for and have no luck so far. Calif at least where I am has little junk yards with old parts in them mostly all newer vehicles that supply parts to the back yard repair shops I guess.
I just posted another request for info todaydumb me forgot I had posted this before and got a great picture from Greenmachine...........gettin old.
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