looking for the correct water pump pulley
Thread Starter
Safety Car
Joined: Jun 2005
Posts: 3,775
Likes: 4
looking for the correct water pump pulley
my belts have never correctly lined up, and im getting sick of buying new alternator belts every 2 years.
this is for a 69 350/300hp, manual, no ac. i think all i need is a 2 groove pulley, one for the crank and one for the alternator.
i dont have the number for the pulley on hand, but i think it said it was a BB part when i looked it up a few years ago.
this is for a 69 350/300hp, manual, no ac. i think all i need is a 2 groove pulley, one for the crank and one for the alternator.
i dont have the number for the pulley on hand, but i think it said it was a BB part when i looked it up a few years ago.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
au:
perhaps? ... maybe? ... your water pump is later 'vette specific' short pump that's just a bit longer than early short pump. Maybe?
*everything on internet's suspect; including the very words I just wrote.
perhaps? ... maybe? ... your water pump is later 'vette specific' short pump that's just a bit longer than early short pump. Maybe?
*everything on internet's suspect; including the very words I just wrote.
Le Mans Master
Joined: Jun 2005
Posts: 5,447
Likes: 3
From: Syracuse NY
I'll try to find the thread and link you to it.
Le Mans Master
Joined: Jun 2005
Posts: 5,447
Likes: 3
From: Syracuse NY
Post # 15 in the following thread has the salvage yard name and number.
You'll probably be better off just calling them.
http://forums.corvetteforum.com/c3-t...mp-pulley.html
You'll probably be better off just calling them.
http://forums.corvetteforum.com/c3-t...mp-pulley.html
Terrorizing Orange Cones
Joined: Oct 2007
Posts: 2,572
Likes: 17
From: Northern CO
Didn't see a PS pump in your pic. My 72 has ps and the alt.
For comparison, here's off-car images of my 2-groove WP and crank pulley's:
FWIW: my SB wp pulley looks different than yours. Allegedly, mine was never changed and they line up correctly on a NOM SB.
Hope you get a line on fixing your problem soon and get back where you want to go, literally.
For comparison, here's off-car images of my 2-groove WP and crank pulley's:
FWIW: my SB wp pulley looks different than yours. Allegedly, mine was never changed and they line up correctly on a NOM SB.
Hope you get a line on fixing your problem soon and get back where you want to go, literally.
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Drifting
Joined: Apr 2007
Posts: 1,970
Likes: 45
From: Cameron Park CA
(I fixed my problem by machining a spacer to move the crank pulley forward to match up with the w/p pulley.)
Thread Starter
Safety Car
Joined: Jun 2005
Posts: 3,775
Likes: 4
ill pull the numbers off my pump and and pulley tomorrow.
i wish i could find my old water pump, i know its in the garage or basement.... somewhere.
i also know some one had their hands on this car before i or my dad had it (he bought it back in 74 or so) as ive found more then a few things that arent right. like the guts of my diff not being something that was offered by GM.
i wish i could find my old water pump, i know its in the garage or basement.... somewhere.
i also know some one had their hands on this car before i or my dad had it (he bought it back in 74 or so) as ive found more then a few things that arent right. like the guts of my diff not being something that was offered by GM.
Thread Starter
Safety Car
Joined: Jun 2005
Posts: 3,775
Likes: 4
ok, i lied. i went out and pulled it off just a moment ago.
Number on the WP Pulley - 391114 JH
Number on Current WP - 2244? 2241? hard to say. its a napa reman.
Number on Previous WP - GM23 8782808 F78
Number on the WP Pulley - 391114 JH
Number on Current WP - 2244? 2241? hard to say. its a napa reman.
Number on Previous WP - GM23 8782808 F78
Drifting
Joined: Apr 2007
Posts: 1,970
Likes: 45
From: Cameron Park CA
I may have misspoke in my post #9 above. The third pulley, for the smog pump, on the w/p is not of one piece with the two other pulleys. I realized that when I went to look at my car and the original engine sitting under the bench. Mine is a early November 1969 built car, so perhaps the pulleys were different from when your car was built, i.e., separate instead of all three integral.
The w/p on the original engine is marked GM23 3839176. It is NOT an original pump, it has a plugged opening on the top for a by-pass hose used in some applications - like yours in the photo. I measured the pump, it is 5 5/8" from the gasket surface to the flange on the shaft.
From the photo above, it looks like you may have the long short Corvette pump, used in the later C3s.
I know somebody in the past posted the difference in w/p lengths, and gave the year the change was made. I didn't find it using search. Perhaps somebody will chime in with the dimensions.
I hope this helps,
Pete
The w/p on the original engine is marked GM23 3839176. It is NOT an original pump, it has a plugged opening on the top for a by-pass hose used in some applications - like yours in the photo. I measured the pump, it is 5 5/8" from the gasket surface to the flange on the shaft.
From the photo above, it looks like you may have the long short Corvette pump, used in the later C3s.
I know somebody in the past posted the difference in w/p lengths, and gave the year the change was made. I didn't find it using search. Perhaps somebody will chime in with the dimensions.
I hope this helps,
Pete
Thread Starter
Safety Car
Joined: Jun 2005
Posts: 3,775
Likes: 4
i still think ive got a wrong pulley some place, either the wp or the crank. only reason i say this is because on the crank, the gap between the grooves is rather narrow, where as the gap between the grooves on the wp are measurably and visably wider. this can almost be seen in the 2nd picture.
so at this point it looks like ive got too long of wp, and either too wide of pulley, or too narrow of pulley.
The non severe duty pump for a Corvette up to 70 has the 5/8" shaft end and is Block to hub----5.625". This is 0.17" shorter than the commonly referred to Corvette pump of Block to hub----5.795"
so at this point it looks like ive got too long of wp, and either too wide of pulley, or too narrow of pulley.
The non severe duty pump for a Corvette up to 70 has the 5/8" shaft end and is Block to hub----5.625". This is 0.17" shorter than the commonly referred to Corvette pump of Block to hub----5.795"
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
I don't know if GM did the early SB Vettes the same as the BB's? I know they had some Z-28 Camaros with a single belt that was just around the crank and water pump, the one in front of that was to the crank/WP/Alternator.
1st Gear
Joined: Sep 2012
Posts: 1
Likes: 0
I realize this is an old thread, but you have the wrong WP pulley. That is the WP pulley for a '66 to '68 Olds Cutlass & 442 with 330, 350, 400 or 455 with A/C & P/S. The matching pair (for the Olds) is as follows: The crank pulley is stamped 389645 JB, 3 groove and is 7 1/8" in dia & 2 3/16" deep. The water pump pulley is stamped 391114 JH, 3 groove and is 6 5/16" in dia. & 2 ½" deep. Hope this helps. BTW - You'll make some Olds person happy if you put it on Fleabay.
Last edited by OldsJoe; Sep 22, 2012 at 08:57 PM.
