[DML] Re: Water Pump Style

["Toby Peterson" <tobyp@xxxxxxxxxxxx>]

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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