Water Pump Pulley Rubs on Pump Casting
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From: Buxton Maine
Water Pump Pulley Rubs on Pump Casting
1969 L46, no ac, p/s....Having some trouble with the water pump pulley rubbing on the pump itself. Looks like it interferes by nearly 1/8". Did they come originally with a spacer or pulley reinforcement between the w/p hub and the pulley?
The aim isn't a lot of help in this case as it shows base motor pulley 3890419 which I believe is a 7" pulley but L46 I think is supposed to have 5 7/8" deep groove pulley which is what I have on it now. The stock length belts seem the right length for L46 with p/s
The problem with the AIM is that the L46 option action has been usurped by the LT-1 option so no info available there AFAIK.
BTW the water pump is 5 5/8" from the block to the hub face so that seems right. Could it be there are different W/P castings and I need one with more relief where the rubbing occurs? Or should the pulley be shimmed out 1/8"? Thanks for any help, Rick
edit: Just wanted to add that the w/p has a 5/8" shaft and 1.750" bolt hole circle which I believe is right for this car. The pulley on it is double groove 5 7/8" p/n 3995641.
The aim isn't a lot of help in this case as it shows base motor pulley 3890419 which I believe is a 7" pulley but L46 I think is supposed to have 5 7/8" deep groove pulley which is what I have on it now. The stock length belts seem the right length for L46 with p/s
The problem with the AIM is that the L46 option action has been usurped by the LT-1 option so no info available there AFAIK.
BTW the water pump is 5 5/8" from the block to the hub face so that seems right. Could it be there are different W/P castings and I need one with more relief where the rubbing occurs? Or should the pulley be shimmed out 1/8"? Thanks for any help, Rick
edit: Just wanted to add that the w/p has a 5/8" shaft and 1.750" bolt hole circle which I believe is right for this car. The pulley on it is double groove 5 7/8" p/n 3995641.
Last edited by 69L46vert; Sep 19, 2014 at 10:32 AM. Reason: Added info
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From: Buxton Maine
Thanks for replying MelWff. The pump itself might be the problem. No GM number. Must be a repro maybe for a Corvette with a larger W/P pulley is all I can think of since it's 5 5/8" .
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From: Calgary Alberta
1969 L46, no ac, p/s....Having some trouble with the water pump pulley rubbing on the pump itself. Looks like it interferes by nearly 1/8". Did they come originally with a spacer or pulley reinforcement between the w/p hub and the pulley?
The aim isn't a lot of help in this case as it shows base motor pulley 3890419 which I believe is a 7" pulley but L46 I think is supposed to have 5 7/8" deep groove pulley which is what I have on it now. The stock length belts seem the right length for L46 with p/s
The problem with the AIM is that the L46 option action has been usurped by the LT-1 option so no info available there AFAIK.
BTW the water pump is 5 5/8" from the block to the hub face so that seems right. Could it be there are different W/P castings and I need one with more relief where the rubbing occurs? Or should the pulley be shimmed out 1/8"? Thanks for any help, Rick
edit: Just wanted to add that the w/p has a 5/8" shaft and 1.750" bolt hole circle which I believe is right for this car. The pulley on it is double groove 5 7/8" p/n 3995641.
The aim isn't a lot of help in this case as it shows base motor pulley 3890419 which I believe is a 7" pulley but L46 I think is supposed to have 5 7/8" deep groove pulley which is what I have on it now. The stock length belts seem the right length for L46 with p/s
The problem with the AIM is that the L46 option action has been usurped by the LT-1 option so no info available there AFAIK.
BTW the water pump is 5 5/8" from the block to the hub face so that seems right. Could it be there are different W/P castings and I need one with more relief where the rubbing occurs? Or should the pulley be shimmed out 1/8"? Thanks for any help, Rick
edit: Just wanted to add that the w/p has a 5/8" shaft and 1.750" bolt hole circle which I believe is right for this car. The pulley on it is double groove 5 7/8" p/n 3995641.
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From: Buxton Maine
Melting Slicks
Joined: Nov 2001
Posts: 2,668
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From: Eastern US XX
Sounds like you could possibly have a '71 Pulley!
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Short-Style Pump for most 1955-72 cars & trucks (5/8" pilot shaft)
- Fits all 1955-68 S/B Chevy passenger cars, 1969-70 350 c.i.d. Corvettes and 1955-72 light duty trucks.
- Has 3/4" ball/ball bearing.
- Dimension from block surface to hub: 5-5/8". Inlet diameter: 1.80".
Long-Style Pump for 1969-87 V8, 90° V6 & 1973-86 truck (5/8" pilot shaft)
- Fits all 1969-87 S/B Chevy or 90° V6 passenger cars and 1973-86 light duty trucks. Does not fit Corvettes (use #8810 or #8812) or late-model vehicles with serpentine accessory drive belts (use #8881).
- Has heavy-duty 3/4" ball/roller bearing.
- Dimension from block surface to hub: 6-15/16". Inlet diameter: 1.80".
Short-Style Pump for 1971-82 Corvettes 3/4" pilot shaft)
- Fits all 1971-82 S/B Corvettes.
- Comes with heavy-duty 3/4" ball/roller bearing.
- Dimension from block surface to hub: 5-13/16". Inlet diameter: 1.80".
----------------------------------------------------------------------
Short-Style Pump for most 1955-72 cars & trucks (5/8" pilot shaft)
- Fits all 1955-68 S/B Chevy passenger cars, 1969-70 350 c.i.d. Corvettes and 1955-72 light duty trucks.
- Has 3/4" ball/ball bearing.
- Dimension from block surface to hub: 5-5/8". Inlet diameter: 1.80".
Long-Style Pump for 1969-87 V8, 90° V6 & 1973-86 truck (5/8" pilot shaft)
- Fits all 1969-87 S/B Chevy or 90° V6 passenger cars and 1973-86 light duty trucks. Does not fit Corvettes (use #8810 or #8812) or late-model vehicles with serpentine accessory drive belts (use #8881).
- Has heavy-duty 3/4" ball/roller bearing.
- Dimension from block surface to hub: 6-15/16". Inlet diameter: 1.80".
Short-Style Pump for 1971-82 Corvettes 3/4" pilot shaft)
- Fits all 1971-82 S/B Corvettes.
- Comes with heavy-duty 3/4" ball/roller bearing.
- Dimension from block surface to hub: 5-13/16". Inlet diameter: 1.80".
