RE: [DML] Re: Water Pump Style

["John Hervey" <john@xxxxxxxxxxxxxxxx>]

Group, Out of the 100's of pumps sold, I have had 2 press on pump pulleys
come loose and we replace them No charge. 
Since then we changed the internal dimensions ( no longer factory ) or ID
where the pulley meets the shaft and they are much tougher to press on and I
don't feel they will ever come loose. 
We also have the bolt on pulley with stainless steel hardware which is also
a lifetime warranty. 
As far as warranty on pumps. We normally give a 5 year warranty and have had
only one pump come back that leaked but we will evaluate any situation that
may arise. It's not that big a deal. 
Be assured that we do our best to always take care of the customer on the
parts we sell even if there has been some neglect but any vendor would
expect the customer to take care of the parts in the car by prudent
servicing and care.
John Hervey
www.specialtauto.com

       

-----Original Message-----
From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf Of
Toby Peterson
Sent: Friday, December 16, 2005 1:41 PM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: [DML] Re: Water Pump Style

Dave - I am obviously a little bit biased regarding this topic, but 
I'll have a go at it.  The press-on pulleys rely on interference fit 
between the pulley and the water pump shaft to stay in position, and 
transmit the torque from the pulley into the pump.  If the fit is just 
a little loose (by just a few ten thousandth's of an inch), the pulley 
can drift fore and aft on the shaft (affecting belt alignment), or slip 
on the shaft (affecting pump performance).  Either of these scenarios, 
if left unattended, will result in wear on the shaft and eventual 
failure of the pump.  This sensitivity of the fit between the parts is 
the main problem with the pressed-on pulley arrangement.  Again, this 
is all my opinion.  The bolt-on pulleys do not have this requirement 
for an interference fit.  The torque is transmitted in shear through 
the four attachment bolts, which is a very efficient way to transmit 
torque.  Our bolt-on pulleys happen to also be works of automotive art 
(a glistening jewel in the engine compartment).  Our waterpumps (with 
the bolt-on pulley) come with a lifetime warranty. 

Toby Peterson  VIN 2248 "Winged1"
DeLorean Parts Northwest, LLC
www.delorean-parts.com


--- In dmcnews@xxxxxxxxxxxxxxx, "usndmc" <usndmc@xxxx> wrote:
>
> Group,
> 
> I am going to get a new water pump soon, and I am curious as to 
> advantages/disadvantages of the 4-bolt on pulley style and the 
> original press-on pulley style. Is there anything besides ease of 
> removal of the pulley? Just looking for a little enlightenment as to 
> the differences. Thanks everyone, happy holidays!
> 
> Dave
> #5968
>









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