CRG Discussion Forum

Camaro Research Group Discussion => Originality => Topic started by: KurtS on March 21, 2017, 08:40:03 PM

Title: Pulley diameters - anyone have these pulleys
Post by: KurtS on March 21, 2017, 08:40:03 PM
Can you help with this pulley list?
Here is a list of first gen pulleys that we don't have the diameter (list is also on-site). The alternator pulleys don't always have numbers stamped on them so it would have to come from an known original part.
Diameter is simply the OD of the part. (Originally, they would have been measured over steel balls because you care where the belt sits, not the OD.)  Sorry about the column alignment, took work to even get it this nice!
SB is small block, BB is big block, DG is deep groove.

Pulley #   Application     Notes        Year
1969433   Alternator     L6, K76     68
3744043   Crank           SB             67, 68
3755820   Crank           SB     67
3770245   Water pump   DG, Z/28   67, 68
3790337   Crank ext for ps   L6     69
3844100   Alternator      DG, BB   67
3850156   Alternator      L6, 3843346 fan used   67
3853104   Crank ext for ps   L6 with A/C   67
3853400   Crank ext for ps   230 cu in   67
3860457   Power steering         67, 68
3863108   Crank           BB, DG, cast iron   67
3869978   Crank           DG, cast iron   67, 68
3871253   Alternator     L6, cast iron, 3843346 fan used   67
3874412   Crank           BB     67
3874416   Crank ext for ps   BB     67
3876846   Water pump         68
3876872   Crank ext for ps   L6     67, 68, 69
3880886   Power steering    L6     68, 69
3890419   Water pump        67, 68
3909815   Alternator      Fan and pulley are one piece   67
3909817   Alternator                67
3916385   Crank ext for ps   DG, Z/28   67, 68
3921923   Crank           DG, BB   68
3927789   Water pump  L6 with A/C   69
3932498   Crank           w/ PS, unverified usage   69
3937788   Crank           BB, unverified usage   69
3941105   Power steering   DG     69
3947824   Water pump  DG, BB   69
3955290   Crank           BB     69
3955291   Crank           DG, BB   69
3956664   Crank                69

Thanks!
Kurt
Title: Re: Pulley diameters - anyone have these pulleys
Post by: HawkX66 on March 22, 2017, 12:11:59 PM
I have a couple of those BB 69 pulleys on my original 396 Kurt. I'll try to grab some measurements for you tonight. My water pump pulley isn't on your list though. Do you want that? 3932402 UD

Water Pump
(https://c1.staticflickr.com/6/5463/30396566173_48cf2c82bc.jpg) (https://flic.kr/p/Nj3m88)

Crank Pulley
3955290 AD

(https://c1.staticflickr.com/6/5331/30836452590_46057f7572.jpg) (https://flic.kr/p/NYUT2G)



Title: Re: Pulley diameters - anyone have these pulleys
Post by: jdv69z on March 22, 2017, 03:26:57 PM
Do you want them measured with a tape, or with a calipers? So with a tape it might look like 6 3/4", but it might measure 6.80" with a calipers.
Title: Re: Pulley diameters - anyone have these pulleys
Post by: KurtS on March 22, 2017, 04:07:45 PM
Calipers would be preferred and more accurate, but tape is fine. 
Most pulleys already have a diameter noted - http://www.camaros.org/engine.shtml#PulleySpreadsheet. Just trying to complete the table. :)

Thanks!
Title: Re: Pulley diameters - anyone have these pulleys
Post by: stovebolt on March 22, 2017, 09:12:14 PM
1969433. I bought this NOS pulley for my 1968 L6 Sport Coupe. There are no markings on the pulley. The O.D. is 2.25".
Title: Re: Pulley diameters - anyone have these pulleys
Post by: 1968RSZ28 on March 22, 2017, 11:36:42 PM
3770245 Water pump DG, Z/28  67, 68 ≈ 7.1 (≈ 7-3/32" with tape measure) code CC

3916385 Crank ext for ps DG, Z/28  67, 68 ≈ 6.7 (≈ 6-11/16" with tape measure) code CD

Paul
Title: Re: Pulley diameters - anyone have these pulleys
Post by: KurtS on March 23, 2017, 06:43:35 AM
Stovebolt,
That's one that I didn't think we would ever get the dimensions!

Paul & Stove,
Thanks!
Title: Re: Pulley diameters - anyone have these pulleys
Post by: jdv69z on March 23, 2017, 01:50:31 PM
I've measured my 69 Z power steering pulley at 5.75" I can't verify it's the part number you listed, but it should be. I've attached a pic. Does it look like the correct one?
Title: Re: Pulley diameters - anyone have these pulleys
Post by: KurtS on March 23, 2017, 05:16:39 PM
Thanks, it looks correct.
Title: Re: Pulley diameters - anyone have these pulleys
Post by: rich69rs on March 23, 2017, 09:18:58 PM
3956664                   69
 1969 SB Base V8; CF code
6-3/4" OD, by tape
Title: Re: Pulley diameters - anyone have these pulleys
Post by: rich69rs on March 23, 2017, 09:19:34 PM
3956664            69
 1969 SB Base V8; CF code
6-3/4" OD, by tape
Title: Re: Pulley diameters - anyone have these pulleys
Post by: KurtS on March 24, 2017, 12:07:35 AM
Slowly knocking them off the list. Thanks!
Title: Re: Pulley diameters - anyone have these pulleys
Post by: Marty on March 24, 2017, 03:22:38 AM
I have several on the list but no time to get to them right now. I might have notes on some too. Will post when I have time.

Martin
Title: Re: Pulley diameters - anyone have these pulleys
Post by: HawkX66 on March 24, 2017, 04:54:00 PM
Crank Pulley
3955290 AD

6.75" measuring tape

(https://c1.staticflickr.com/6/5331/30836452590_46057f7572.jpg) (https://flic.kr/p/NYUT2G)

Title: Re: Pulley diameters - anyone have these pulleys
Post by: plumL78 on March 27, 2017, 07:28:23 PM
3844100 alternator pulley is 3.218
Title: Re: Pulley diameters - anyone have these pulleys
Post by: KurtS on March 28, 2017, 02:34:35 AM
Thanks guys! 7 down!
Title: Re: Pulley diameters - anyone have these pulleys
Post by: plumL78 on March 29, 2017, 12:38:17 PM
3863108  BB cast crank  67  is 6.735 or just .015 short of 6 3/4
Title: Re: Pulley diameters - anyone have these pulleys
Post by: plumL78 on March 29, 2017, 12:46:07 PM
3869978 triple groove cast pulley in the same as the 108  cast pulley   6.735 or  .015  short of 6 3/4
Title: Re: Pulley diameters - anyone have these pulleys
Post by: jdv69z on March 29, 2017, 02:59:05 PM
Still need this one?  3947824   Water pump  DG, BB   69

I've got one on my car, but I don't know how to measure it with everything in the way?
Title: Re: Pulley diameters - anyone have these pulleys
Post by: KurtS on March 29, 2017, 05:39:17 PM
Thanks Kerry!

Jimmy, easiest for someone with the pulley to measure one. Measuring the circumference and dividing by pi has some error. :)
Title: Re: Pulley diameters - anyone have these pulleys
Post by: 1968RSZ28 on March 29, 2017, 06:13:43 PM
3876846 Water pump 68 ≈ 6.1 (≈ 6-1/8" with tape measure) code DJ

Note - I didn't measure this pulley myself. I gave this pulley to a friend a few months ago and he measured it for CRG. ;)

Paul
Title: Re: Pulley diameters - anyone have these pulleys
Post by: ko-lek-tor on March 29, 2017, 06:28:03 PM
3863108 6 11/16 in
3874412 6 11/16 in
3874416 6 3/4in
3947824 5 7/8in
3955291 6 11/16in

Paul I get 6 3/16in on 3876846 DJ
Title: Re: Pulley diameters - anyone have these pulleys
Post by: 1968RSZ28 on March 29, 2017, 06:54:20 PM
3876846 Water pump 68 ≈ 6.1 (≈ 6-1/8" with tape measure) code DJ

Note - I didn't measure this pulley myself. I gave this pulley to a friend a few months ago and he measured it for CRG. ;)

Paul I get 6 3/16in on 3876846 DJ

Hi Bentley - I'd go with your measurement (+ 1/16"). As per my note above, I didn't measure the pulley myself so I can't guarantee accuracy. ;)

Paul
Title: Re: Pulley diameters - anyone have these pulleys
Post by: jdv69z on March 29, 2017, 06:55:31 PM
Looks like somebody's got it covered.
Title: Re: Pulley diameters - anyone have these pulleys
Post by: plumL78 on March 29, 2017, 09:22:32 PM
Happy to help Kurt
Title: Re: Pulley diameters - anyone have these pulleys
Post by: rare396bronze on March 30, 2017, 03:03:15 AM
3921923  about 2 lines past 6 3/4. Hope the helps. About the only pi I know is apple or cherry pie!
Title: Re: Pulley diameters - anyone have these pulleys
Post by: KurtS on March 31, 2017, 02:05:51 AM
Here is the updated 'missing' list:

Pulley #   Application     Notes        Year
3744043   Crank           SB             67, 68
3755820   Crank           SB     67
3790337   Crank ext for ps   L6     69
3850156   Alternator      L6, 3843346 fan used   67
3853104   Crank ext for ps   L6 with A/C   67
3853400   Crank ext for ps   230 cu in   67
3860457   Power steering         67, 68
3871253   Alternator     L6, cast iron, 3843346 fan used   67
3876872   Crank ext for ps   L6     67, 68, 69
3880886   Power steering    L6     68, 69
3890419   Water pump        67, 68
3909815   Alternator      Fan and pulley are one piece   67
3909817   Alternator                67
3927789   Water pump  L6 with A/C   69
3932498   Crank           w/ PS, unverified usage   69
3937788   Crank           BB, unverified usage   69

Thanks!
Kurt
Title: Re: Pulley diameters - anyone have these pulleys
Post by: Marty on March 31, 2017, 02:43:08 AM
3744043 and 3755820 are both 6 3/4"

I think the stamped steel PS pulleys are all the same diameter.

Martin
Title: Re: Pulley diameters - anyone have these pulleys
Post by: HawkX66 on March 31, 2017, 11:52:20 AM
Here is the updated 'missing' list:

Pulley #   Application     Notes        Year
3744043   Crank           SB             67, 68
3755820   Crank           SB     67
3790337   Crank ext for ps   L6     69
3850156   Alternator      L6, 3843346 fan used   67
3853104   Crank ext for ps   L6 with A/C   67
3853400   Crank ext for ps   230 cu in   67
3860457   Power steering         67, 68
3871253   Alternator     L6, cast iron, 3843346 fan used   67
3876872   Crank ext for ps   L6     67, 68, 69
3880886   Power steering    L6     68, 69
3890419   Water pump        67, 68
3909815   Alternator      Fan and pulley are one piece   67
3909817   Alternator                67
3927789   Water pump  L6 with A/C   69
3932498   Crank           w/ PS, unverified usage   69
3937788   Crank           BB, unverified usage   69

Thanks!
Kurt

You're missing the one I posted for 290.
Title: Re: Pulley diameters - anyone have these pulleys
Post by: rich69rs on March 31, 2017, 02:43:52 PM
The list of "the missing" is definitely getting shorter!
Title: Re: Pulley diameters - anyone have these pulleys
Post by: KurtS on March 31, 2017, 04:44:37 PM
Thanks Martin. Yes, many of the pulleys are the same size.

You're missing the one I posted for 290.
You're missing what that list is of - the missing ones!
Title: Re: Pulley diameters - anyone have these pulleys
Post by: rare396bronze on April 02, 2017, 12:29:20 AM
3890419 2 lines over 6 1/4. 3860457 one line under 5 3/4.
Title: Re: Pulley diameters - anyone have these pulleys
Post by: ko-lek-tor on April 02, 2017, 12:56:07 AM
3890419 2 lines over 6 1/4. 3860457 one line under 5 3/4.
By any chance do you know what scale you used to measure? How many lines are between each inch mark?
So that it can further be pinpointed as to what "1line under...2lines over" can be determined, please?
Title: Re: Pulley diameters - anyone have these pulleys
Post by: rare396bronze on April 02, 2017, 01:07:55 AM
If I measure with my Stanley tape measurer. If I say 3860457 it the one line before  5 3/4 I mean the next line mark before 5 3/4.
Title: Re: Pulley diameters - anyone have these pulleys
Post by: rare396bronze on April 03, 2017, 01:46:01 AM
There is 8 line's to each 1/4. So that means 32 lines.
Title: Re: Pulley diameters - anyone have these pulleys
Post by: KurtS on April 03, 2017, 02:24:32 AM
Yikes, take it down a notch guys. That was not necessary Bentley.

It's no problem, it's either 1/32 or 1/16. Sounds like 1/32 , so about 6.3 and 5.7.
Thanks!
Title: Re: Pulley diameters - anyone have these pulleys
Post by: 69Z28-RS on April 03, 2017, 05:24:05 AM
3890419 2 lines over 6 1/4. 3860457 one line under 5 3/4.

3890419 -  6-5/16"         3860457  -  5-23/32"
Title: Re: Pulley diameters - anyone have these pulleys
Post by: ko-lek-tor on April 03, 2017, 12:48:06 PM
Yikes, take it down a notch guys. That was not necessary Bentley.
Apologies. A little humor mixed with a splash of sarcasm and a heaping of frustration when I can't be understood. I was outta line and sincere apologies to members affected. I did learn a lot about humorous measurements though.