Water Pump Lengths
#81
so, perhaps the previous owner put an incorrect pump on the engine. The pulley that was on it was 3 groove, The p/s pulley lined up OK. The alternator pulley did not. It is too far in towards the engine so the belt is way out of line and sequels.
The part number cast into the pump is 31290.
3 pics attached:
pulley is 3 groove. middle groove is too far towards the engine and is the cause of the misalignment.
Both pulley 2 & 3 are have too short a "snout"
I need a 2 groove pulley like 2 & 3, but with the 1 5/8" dimension of the incorrect pulley shown on the orange ruler.
Does that exist?
If I need to get a new pump, what pulley would I need for that?
Thank you so very much for your guidance in this confusing mess I have gotten into.
pulley 1 original
pulley 2
pulley 3
The part number cast into the pump is 31290.
3 pics attached:
pulley is 3 groove. middle groove is too far towards the engine and is the cause of the misalignment.
Both pulley 2 & 3 are have too short a "snout"
I need a 2 groove pulley like 2 & 3, but with the 1 5/8" dimension of the incorrect pulley shown on the orange ruler.
Does that exist?
If I need to get a new pump, what pulley would I need for that?
Thank you so very much for your guidance in this confusing mess I have gotten into.
pulley 1 original
pulley 2
pulley 3
#82
The three groove pulley you have is from a 1980s 307 and was used on the 6.1" pump. Is the crank pulley original to the 1968 motor or not. Trying to mix and match pulleys will be a disaster. Get the correct pump and pulleys that match. What alternator bracket are you using? The pump, pulleys, and brackets all need to be a matched set.
#83
I found a 5.6' pump. Would that take the black 2 groove pulley in my previous post?
The grey pulley should go on the 5.1" pump, correct?
How do I find out what P/S bracket and alternator bracket is on the engine?
Both those pulleys are in alignment as they should be.
Just the water pump is not lined up.
Where are the 5.1 pumps available?
The grey pulley should go on the 5.1" pump, correct?
How do I find out what P/S bracket and alternator bracket is on the engine?
Both those pulleys are in alignment as they should be.
Just the water pump is not lined up.
Where are the 5.1 pumps available?
#84
#85
Just any FYI, I know the thread is old but, there is a another 5.1" water pump out there. The Carter W343M from rocker auto.
yes I know how to spell.
ref: https://carterengineered.com/engine-water-pump-w343m
yes I know how to spell.
ref: https://carterengineered.com/engine-water-pump-w343m
Last edited by derone; June 20th, 2024 at 09:47 AM.
#86
Just any FYI, I know the thread is old but, there is a another 5.1" water pump out there. The Carter W343M from rocker auto.
yes I know how to spell.
ref: https://carterengineered.com/engine-water-pump-w343m
yes I know how to spell.
ref: https://carterengineered.com/engine-water-pump-w343m
#87
Just any FYI, I know the thread is old but, there is a another 5.1" water pump out there. The Carter W343M from rocker auto.
yes I know how to spell.
ref: https://carterengineered.com/engine-water-pump-w343m
yes I know how to spell.
ref: https://carterengineered.com/engine-water-pump-w343m
#91
#93
#94
#96
Dayco 76975 or Gates 26392 or Continental 58983 is a 2.00 to 1.75 reducer bushing to use the 1971-up water pump on a 1970-older car.
#98
#100
The three groove pulley you have is from a 1980s 307 and was used on the 6.1" pump. Is the crank pulley original to the 1968 motor or not. Trying to mix and match pulleys will be a disaster. Get the correct pump and pulleys that match. What alternator bracket are you using? The pump, pulleys, and brackets all need to be a matched set.
THANK YOU SO VERY MUCH FOR YOUR GUIDANCE.
My ride is back on the road.
.Thanks also to all others for their most helpful posts.
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