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#1 |
Not too old to learn
Join Date: Mar 2004
Location: SoCal
Posts: 617
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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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1968 C10 a way to long restoration. |
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#2 |
Senior Member
![]() Join Date: Jul 2004
Location: Estherville, Iowa
Posts: 3,371
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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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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 2001 GMC Sierra 1500 C3 6.0 |
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#3 |
Senior Member
![]() Join Date: Jul 2004
Location: Estherville, Iowa
Posts: 3,371
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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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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 2001 GMC Sierra 1500 C3 6.0 |
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#4 |
Registered User
Join Date: Apr 2008
Location: Gales Creek, Oregon
Posts: 619
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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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There are two kinds of people, those who finish what they start and so on. 70 GMC Longhorn (A.K.A Money Bucket) 57 Chev 3100 05 Chevy LLY Dmax. 67 Chevy Camaro Dad's Budget Build 55 My Longhorn Build |
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#5 | |
Not too old to learn
Join Date: Mar 2004
Location: SoCal
Posts: 617
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Re: 4 groove crankshaft pulley
Quote:
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 far ![]() ![]()
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1968 C10 a way to long restoration. |
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#6 | |
I really hate wet sanding!
![]() Join Date: Dec 2008
Location: Brookfield, MO
Posts: 601
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Re: 4 groove crankshaft pulley
Quote:
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#7 |
Not too old to learn
Join Date: Mar 2004
Location: SoCal
Posts: 617
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Re: 4 groove crankshaft pulley
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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1968 C10 a way to long restoration. |
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#8 |
Registered User
Join Date: Apr 2008
Location: Gales Creek, Oregon
Posts: 619
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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
__________________
There are two kinds of people, those who finish what they start and so on. 70 GMC Longhorn (A.K.A Money Bucket) 57 Chev 3100 05 Chevy LLY Dmax. 67 Chevy Camaro Dad's Budget Build 55 My Longhorn Build |
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#9 |
BOHICA
Join Date: Mar 2008
Location: Stewartville, MN
Posts: 440
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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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Trying to save someone from their own stupidity is like teaching a pig to dance. It is a waste of your time, and it annoys the pig! |
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#10 |
Senior Member
![]() Join Date: Jul 2004
Location: Estherville, Iowa
Posts: 3,371
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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 2001 GMC Sierra 1500 C3 6.0 |
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#11 |
Not too old to learn
Join Date: Mar 2004
Location: SoCal
Posts: 617
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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
![]() Thanks
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1968 C10 a way to long restoration. |
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#12 |
Not too old to learn
Join Date: Mar 2004
Location: SoCal
Posts: 617
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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 today ![]() ![]()
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1968 C10 a way to long restoration. |
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