View Full Version : circulating water pump lt1 10128327 question
06-18-2013, 12:08 AM
I have a 95 with the lt1 engine and the 10128327 circulating water pump - not the raw water pump. I need to replace (or at least rebuild it). I am finding other lt1 pumps but would like to make sure the others would work. The above number is GM.
Marine parts wants 509 - too much. I see many that are automotive and much less. Any thoughts on whether or not I can't use automotive or how I can confirm if it has a different part number?
06-18-2013, 08:31 AM
A corvette automotive pump works fine. It has one more heater hose that you have to block off.
06-18-2013, 09:24 AM
A water pump for a '92 Corvette will be the same, later years will have the heater port on the pump.
06-18-2013, 11:07 AM
Thanks. Any idea what the part number is for those?
06-18-2013, 11:20 AM
LT-1 water pump without heater out port: AC Delco 251-537 or GM 12529560 (http://www.amazon.com/gp/product/B000C9KILK/ref=ox_sc_sfl_title_9?ie=UTF8&psc=1&smid=ATVPDKIKX0DER)
If you have a heater, you might use the pump with the heater port to improve the flow to the heater.
06-18-2013, 11:29 AM
Thanks. Nice price $139 - ebay is showing exact same model at over $240. I don't have a heater now. Is that something I can add while I am doing this? Do I want to? :)
Two more: 1. Do I replace the seal on the shaft? 2. I saw I should use sealant on the bottom bolts - any particular kind?
06-18-2013, 11:53 AM
Thanks. Nice price $139 - ebay is showing exact same model at over $240. I don't have a heater now. Is that something I can add while I am doing this? Do I want to? :) Probably not, you would have to buy a heater kit and cut some holes, etc. I have one, but have never used it other than to see if it works.
Two more: 1. Do I replace the seal on the shaft? If I saw any oil leaking around the shaft I would. 2. I saw I should use sealant on the bottom bolts - any particular kind? Any thread sealant should do the job. I used Permatex thread sealant.If you have to replace it, the seal for the shaft is available in a Felpro kit for LT-1's but is hard to find by itself. The kit is about $10, so it's not too bad.
06-18-2013, 12:11 PM
Here is a recent thread on the topic:
06-18-2013, 12:26 PM
Nice topic thread. Very informative - I hadn't seen that one yet.
I will stay away from heater.
Why does everyone paint their parts with the black paint? Is that a protection thing or just for looks? Do I need to paint mine?
06-18-2013, 12:36 PM
I think everyone paints their parts black because that is what Indmar did. The water pump is aluminum, so paint will keep it from oxidizing, but no big deal. I got a little carried away when I painted mine and sanded the ridges and then clear coated it.
You can also see the port I added for the heater.
06-18-2013, 12:38 PM
This is a good thread regarding LT-1 cooling:
06-18-2013, 12:56 PM
Thanks Table Rocker. Well ordered the pump, so now just need to wait for arrival. Not sure yet if I will paint it or not. I guess I should - yours looks great. Any particular type of paint I should use?
06-18-2013, 01:04 PM
I used Dupli-Color engine enamel available at your local part store.
06-22-2013, 04:59 PM
New pump is painted. Old pump is off. Trying to clean the gaskets off the block - could use suggestion here if anyone has one.
06-22-2013, 07:41 PM
What is the recommended maintenance on this water pump? I have a 95 with the LT1, and to my knowledge, it has never been addressed!
06-22-2013, 07:51 PM
New pump is painted. Old pump is off. Trying to clean the gaskets off the block - could use suggestion here if anyone has one.Single edged razor blade for the final clean up works well for me.
What is the recommended maintenance on this water pump? I have a 95 with the LT1, and to my knowledge, it has never been addressed!Run it until it leaks from the weep hole is all you can do.
06-23-2013, 10:24 PM
All installed and working good. No leaking.
Well at least now I am up and able to run. I can do the rest of my projects while using it. :)
Thanks for all the help.