factory alternator pully for 73 307 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mike16 · 01-08-2010, 08:40 PM

restoring my 1972 chevy c 10's engine compartment and I noticed that my lower alternator bracket has some bogus spacers between the bracket and the head. actually they were nuts installed between the bracket and the head so that the alternator pully lined up. clearly this is wrong. but looking at some pictures of other engin compartments I see similar "accomodations". either spacers between the bracket and the head or some sort of spacer rig between the bracket and the alternator.

I have an alternator that has a single groove pully that is almost 3/8 inch thicker than every other one I've seen. the thicker portion is between the pulley groove and the alternator fan. Pictures to follow.

what everybody doing regarding this?

my engine compartment is to remain origional

anybody got pictures of thier al pulley?

mike16 · 01-09-2010, 12:53 AM

sorry its a 72

JimKshortstep4x4 · 01-09-2010, 06:42 AM

Here is a picture but it is not a close up. Usually the pulley alignment problems are caused by mismatching drive or water pump pulleys. With the alternator being the easy fix it is shimmed to match as in your case. From your description, the correct pulley would make your problem worse.

Jim

mrein3 · 01-09-2010, 11:40 AM

Quote:

Originally Posted by JimKshortstep4x4

Here is a picture but it is not a close up. Usually the pulley alignment problems are caused by mismatching drive or water pump pulleys. With the alternator being the easy fix it is shimmed to match as in your case. From your description, the correct pulley would make your problem worse.

Jim

I agree with Jim on this one. I had all kinds of issues with my alternator not lining up with my drive and waterpump pulleys. I tried all my fixes on the alternator. Then one day I got smart and purchased a set of pulleys off a known unmolested truck. All my problems went away.

Jump over to the parts board and look for a matching set of crank and wp pulleys and remove all washers, bolts, and shims from the alt. bracket and mount it to the head like it was intended.

mike16 · 01-09-2010, 05:09 PM

to bad I cant import pictures. they were worth showing:whine

what the pictures would have shown is that one pulley is about 3/8th inch thicker than the other and larger in diameter as well. the thicker pulley places the belt in perfect alignment with my water pump and crqnk pulley. and no home spun spacers are needed.

a survey of local and internet vendors indicate they only sell the thinner pulley alternators

has any body run into this problem?

mike16 · 01-09-2010, 08:54 PM

installed.

roger0080 · 01-10-2010, 02:48 AM

I replaced my original 350 motor with the plain jane GM crate motor.
The heads on it are about 1/4" shorter on the front then the original.
I had to put spacer blocks behind the alternator bracket and the head, which I detest doing, but have to in order for the pulleys to line up.

I think you have the pulley I need! Any idea where to get one?

Jim, I've always liked that blue/white color combo you have there, that is going to be one really nice truck when done. wow.

br161 · 01-10-2010, 02:06 PM

not sure if this helps

01-08-2010, 08:40 PM	#1
mike16 Registered User Join Date: Dec 2009 Location: bisbee, arizona Posts: 1,530	factory alternator pully for 72 307 restoring my 1972 chevy c 10's engine compartment and I noticed that my lower alternator bracket has some bogus spacers between the bracket and the head. actually they were nuts installed between the bracket and the head so that the alternator pully lined up. clearly this is wrong. but looking at some pictures of other engin compartments I see similar "accomodations". either spacers between the bracket and the head or some sort of spacer rig between the bracket and the alternator. I have an alternator that has a single groove pully that is almost 3/8 inch thicker than every other one I've seen. the thicker portion is between the pulley groove and the alternator fan. Pictures to follow. what everybody doing regarding this? my engine compartment is to remain origional anybody got pictures of thier al pulley? Last edited by mike16; 01-09-2010 at 01:02 AM. Reason: she's a 72 not a 73 duh!

01-09-2010, 12:53 AM	#2
mike16 Registered User Join Date: Dec 2009 Location: bisbee, arizona Posts: 1,530	Re: factory alternator pully for 72 307 sorry its a 72 Last edited by mike16; 01-09-2010 at 01:03 AM.

01-09-2010, 06:42 AM	#3
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: factory alternator pully for 73 307 Here is a picture but it is not a close up. Usually the pulley alignment problems are caused by mismatching drive or water pump pulleys. With the alternator being the easy fix it is shimmed to match as in your case. From your description, the correct pulley would make your problem worse. Jim Attached Images __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC Last edited by JimKshortstep4x4; 01-09-2010 at 06:45 AM. Reason: Changed picture

01-09-2010, 05:09 PM	#5
mike16 Registered User Join Date: Dec 2009 Location: bisbee, arizona Posts: 1,530	Re: factory alternator pully for 73 307 to bad I cant import pictures. they were worth showing:whine what the pictures would have shown is that one pulley is about 3/8th inch thicker than the other and larger in diameter as well. the thicker pulley places the belt in perfect alignment with my water pump and crqnk pulley. and no home spun spacers are needed. a survey of local and internet vendors indicate they only sell the thinner pulley alternators has any body run into this problem? Last edited by mike16; 01-09-2010 at 06:37 PM.

01-09-2010, 08:54 PM	#6
mike16 Registered User Join Date: Dec 2009 Location: bisbee, arizona Posts: 1,530	Re: factory alternator pully for 73 307 installed.

01-10-2010, 02:48 AM	#7
roger0080 Registered User Join Date: Nov 2000 Location: Carver County, Minnesota, USA Posts: 626	Re: factory alternator pully for 73 307 I replaced my original 350 motor with the plain jane GM crate motor. The heads on it are about 1/4" shorter on the front then the original. I had to put spacer blocks behind the alternator bracket and the head, which I detest doing, but have to in order for the pulleys to line up. I think you have the pulley I need! Any idea where to get one? Jim, I've always liked that blue/white color combo you have there, that is going to be one really nice truck when done. wow. __________________ 72 Chev C-10 90% restored (former AZ truck) ... 71 Chev K-20 Cheyenne my vacation crusier... 72 Chev C-10 Now retired and striped after many faithful miles... 72 GMC 1500 Retired to the junk yard after bought new in '71...

01-10-2010, 02:06 PM	#8
br161 Registered User Join Date: Aug 2008 Location: goldsboro nc Posts: 62	Re: factory alternator pully for 73 307 not sure if this helps Attached Images



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