Dan, the specs I quoted, are from the 69 Plymouth manual, it's just about the oldest manual I have left, after the 04 hurricanes, I lost from 68 to nearly 58, but your question of, Why a smaller pump? Because the pump is turning faster with the smaller pulley, they reduced the impeller size, to prevent pump cavitation, but still maintain sufficient water flow. I still think the pulley was, in the 5+or - range. Dave
-------------- Original message --------------
From: therichardsonfamily@xxxxxxxxxxx
Oh boy, sometimes engineering just doesn't make sense!
The water pump pulley is definitely towards the front. With a 1/16" clearance between it and the crank pulley, I would have to remove the wp pulley to change the power steering belt - that's OK with me.
One would think that having AC would require better cooling. The FSM confirms a non AC water pump with 4.38" diam. - 10 vanes, and an AC water pump with 3.67" diam. - 6 vanes. Why, oh why, would you have a smaller, fewer vaned water pump on a car with AC?
I have a new water pump sitting here that I was planning on installing (came with the car). It is 4" diam. - 8 vanes. One would assume that will be OK, no?
Back to the water pump pulley diameter question - anyone have a '67 that they could measure that pulley? Thanks for the help.
Dan Richardson
300L Family Heirloom
-------------- Original message --------------
From: sosmi@xxxxxxxxxxx
Dan, the smaller diameter pulley does turn faster, however the wp impeller for a/c cars are smaller diameter, and have less blades. A/C pump 3.5"- 6 vanes, NON A/C 4.38"- 8 vanes, and if I can recall, the PS pump belt is first to go on . If the WP pulley is too close to the crank pulley, you'll have to remove it to change belts? Somebody with a 67 could tell. Dave.
-------------- Original message --------------
From: therichardsonfamily@xxxxxxxxxxx
Dave & Dave:
The grind it down idea will work (and I already came up with that "dumb idea"), if I need to go that route. I just want to confirm that a 6 & 1/2" diameter is correct. Smaller diameter would turn the water pump faster. With AC, I want to be sure of the measurements.
Other Dave - it is a single pulley, with an idler/tensioner pulley off on the passenger's side.
Dan Richardson
300L Family Heirloom
-------------- Original message --------------
From: "Dave Wilker" <wilkerbeast01@xxxxxxxxxxx>
Dan
One idea (probably a dumb one) is to take your pretty new pulley to a machine shop and ask them to shave it down a bit for clearance. It may make a difference if your pulleys are not perfectly aligned (It might be easier to jump off) but like I said, it is an option. I have seen a few engines that have very little clearance between the pulleys, way less than the thickness of the belt, for instance.
David C. Wilker Jr.
USAF (RET)
----- Original Message -----
Sent: Wednesday, December 13, 2006 9:28 AM
Subject: IML: water pump pulley diameter?
Hello everyone:
What is the exact outer diameter of the water pump pulley for a '67 Imperial, 440cid, with AC, single belt?
I spent $80 (too much!) for a new aluminum one (way too pretty!), that barely doesn't fit. Parts man said it was 6 & 1/2" diameter - it actually measures 6 & 11/16". I think 6 & 1/2" would fit with a clearance on the crank pulley of 1/16"
Do those measurements make sense? Is there really only 1/16" clearance between the crank pulley & the water pump pulley? Is 6 & 1/2" the correct diameter for the water pump pulley on this engine?
Thanks in advamce for any insight offered.
Dan Richardson
300L Family Heirloom
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