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Oooops... I've got it now. Smaller pulley =
faster rotation = more water volume = cooler water for AC. That would then
mean that I should NOT use this big pulley with AC. Now I'll need to find
the correct pulley.
Anyone out there have a chance to measure the
diameter of an AC, '67, 440cid, from an Imperial?
Dan Richardson
300L Family Heirloom
----- Original Message -----
Sent: Wednesday, December 13, 2006 5:29
PM
Subject: Re: IML: water pump pulley
diameter?
Dan, thats smaller pulley On A/C, I'd bet the 65-68 guys have the
same thing, Dan Collins where are you?, I think he has a 67. Anyway, I
think its 5 o'clock someware. Ya'll have a nice day, Dave.
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Original message --------------
From: therichardsonfamily@xxxxxxxxxxx
Aha! A smaller pulley on the non-AC water pump - that makes
sense. Thanks for the "theory" behind the engineering.
I still need someone to confirm the water pump pulley diameter on the
AC engine, then I can make a decision, to grind, or not to grind.
Thanks again Dave
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Original message --------------
From: sosmi@xxxxxxxxxxx
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
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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
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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.
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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
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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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