Re: [Chrysler300] 300F Water Pump

["mgoodknight@xxxxxxxx" <mgoodknight@xxxxxxxx>]

More than two repetitions of the same type problem are almost always the result of "pilot error", in this case "mechanic error".  At the risk of writing an insult to you I'm suggesting that belt tension is a likely problem even though you stated that the tension was not too great.  You did not state how you determined that the tension was correct and if you did not follow a prescribed procedure for establishing the correct tension it is likely wrong.  I generally prefer a belt to be no tighter than is necessary to prevent slippage in normal operating conditions and with good belts and pulleys.  That's difficult to determine, so I recommend following the tech manual.
That said there are other possible causes that need consideration.  I'm not too much offended by shimming an incorrect pulley as long as the shimming produces a good fit and that the pulley will run smoothly as it should.  I; however, would still put considerable effort toward getting and installing a correct pulley.  It is important that the fan be balanced both statically and dynamically.  It will not be dynamically balanced if there is a bent blade.  I've never seen a severely out of balance clutch, but I suppose it can happen.  Be sure to evaluate other pulleys in the system.  If one of the other pulleys does not run straight a varying belt tension and a resulting vibration will be transmitted to the water pump.  I've seen many pulleys with some damage to a side and that can cause a narrowing or widening of the vee section as the pulley rotates.  That can cause a destructive vibration and all pulleys should be checked for such a problem.  With as many repetitions of the problem as you have described I have trouble thinking that you got that many bad pumps.

Lots of luck,
Marshall Goodknight,  c300  3n552650
 
 
 

---------- Original Message ----------
From: Thomas Cox <tdcox@xxxxxxxxxxxxx>
To: chrysler300@xxxxxxxxxxxxxxx
Subject: [Chrysler300] 300F Water Pump
Date: Tue, 9 Nov 2010 10:51:05 -0800 (PST)

  
I traveled to the Chicago meet in my F convert, during which I threw at least 
two water pump belts. Upon arriving in Chicago, several guys that know a lot 
more than I do about the F engine noticed that the fan pulley was not lined up 
with the crank pulley. All suggested shimming out the fan  pulley which we did 
by about 3/16â??. I drove home and all seemed well; no belts thrown and car ran 
fine.
 
After arriving home, the engine was properly broken in and I began to increase 
the speeds I drove. Shortly thereafter, the water pump failed as I slowed down 
from about 4,000 rpms. I did have another water pump in the trunk and I replaced 
it. 

 
Within 50 miles, that water pump failed while driving about 60 mph on the 
interstate, taking out the radiator. 

 
So, I bought a NAPA replacement water pump, replaced the water pump with failed 
bearings, had the radiator repaired and installed, cranked it up and it idled 
nicely for about 30 minutes, at which time I shut it down. Upon start-up, the 
new NAPA water pump failed.
 
I am at a loss at what to do. The belts are not too tight. My only thought is 
that shimming out the water pump may have put too much stress on the water pump 
with a fairly heavy fan/clutch assembly. Any other suggestions?? I canâ??t afford 
another radiator rebuild and I am afraid to drive the car any distance. I canâ??t 
understand why I could drive the car nearly 1,000 miles with the shimmed out 
pulley, yet I canâ??t keep a water pump operating without the bearings failing. 
Help!!!

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