Search | Car Forums | Gallery | Articles | Helper | AF 350Z | IgorSushko.com | Corporate |
| Latest | 0 Rplys |
|
Show Printable Version | Email this Page | Subscribe to this Thread |
|
Thread Tools |
11-26-2012, 03:39 PM | #1 | |
AF Newbie
Join Date: Nov 2012
Location: boston, Massachusetts
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
|
Water pump knock... how/why?
After doing some searching I was unable to find what exactly would cause a water pump to create a knocking sound and was wondering of someone here could offer some insight as to how or why a water pump for a 350 (5.7l) would knock. Anyone know or?
A little back story: The other day I had to change the water pump on my '96 k2500 (w/ 5.7l). Bought a brand new pump and put it on, refilled the coolant. No odd noises. Heater blew out very hot air, too. Drove for about 20 miles then parked it for about 6 hours. the radiator was still full and no signs of leaks - everything looked normal. Within 10 seconds of starting the truck there was a rapid knocking... like numerous valves were suddenly out of adjustment or rod bearings crapped out. Shut it off and rechecked everything started it again. The oil pressure was steady at about 55psi. shut it off again. With the serpentine belt off, oil pressure was good and there was no knocking. Put the belt on and the knocking returned. I also tried it with the fan removed and the belt on - still knocking. Returned that water pump and got another and so far no problems. But I still wonder, if it was a bearing or maybe some impeller tolerance was off or what exactly in a water pump could cause a rapid knocking sound. Anyone ever had this happen before and found the culprit? |
|
11-26-2012, 06:01 PM | #2 | ||
AF Fanatic
Join Date: Oct 2007
Location: EVERETT, Massachusetts
Posts: 10,898
Thanks: 8
Thanked 432 Times in 431 Posts
|
Re: Water pump knock... how/why?
Quote:
most products today are not tested so it is a problem for us in making repairs , on occation several times to complete the repair. where did you purchase the pump ? chinese bearings most likely ..the hub bearings from china stay away ! |
||
11-26-2012, 09:15 PM | #3 | |
AF Newbie
Thread starter
Join Date: Nov 2012
Location: boston, Massachusetts
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
|
Re: Water pump knock... how/why?
It was from Carquest. Never had any problems with their parts in the past 10 years.. *shrug*
edit: did some searching and if the secondary p/n is from the manufacturer then it looks like GMB makes the pumps for carquest. |
|
11-27-2012, 07:20 PM | #4 | |
AF Fanatic
Join Date: Oct 2007
Location: EVERETT, Massachusetts
Posts: 10,898
Thanks: 8
Thanked 432 Times in 431 Posts
|
Re: Water pump knock... how/why?
carquest parts are good but more parts are from china. quality is going down.
|
|
|
POST REPLY TO THIS THREAD |
|
|