Re: IML: water pump pulley diameter?

[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 -----

From: therichardsonfamily@xxxxxxxxxxx

To: IML

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