Water pump question
Thread Starter
Instructor
Joined: Nov 2008
Posts: 125
Likes: 0
From: San Jose CA
Water pump question
Just went through a bunch of threads regarding replacement water pumps. I couldn't find anything that shows how to tell if I have an original(and should rebuild) or not and just get a replacement from my local parts store.
Its on a 65 327/300 with a casting# of 3782608 and also had
T GM2 and D47
thanks,
Bob
Its on a 65 327/300 with a casting# of 3782608 and also had
T GM2 and D47
thanks,
Bob
Melting Slicks
Joined: May 2007
Posts: 3,461
Likes: 18
From: cooper city florida
Bob the 608 pump is the correct pump for your 65 300hp......however, your pump is not original to your car. The casting date D47 translates to April 4,1967. If your looking for a rebuilder, I can highly recommend Arthur Gould Rebuilders. He might even have a date coded correct 608 pump on his shelf for your car, if you are interested in going that way
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Team Owner
Joined: Mar 2003
Posts: 26,118
Likes: 1,874
From: Greenville, Indiana
Just went through a bunch of threads regarding replacement water pumps. I couldn't find anything that shows how to tell if I have an original(and should rebuild) or not and just get a replacement from my local parts store.
Its on a 65 327/300 with a casting# of 3782608 and also had
T GM2 and D47
thanks,
Bob
Its on a 65 327/300 with a casting# of 3782608 and also had
T GM2 and D47
thanks,
Bob
I'd go to NAPA if you don't have to have a correct number/date and get one of their rebuilts.
Many NAPA stores can provide a rebuild service on your old core.
Le Mans Master
Joined: Oct 2000
Posts: 8,897
Likes: 1,357
From: Santa Ana CA
Le Mans Master
Joined: Dec 2007
Posts: 8,000
Likes: 659
From: Puget Sound
Corvette pumps don't have the ribs. Many don't know the difference and just go by the casting number. Here's a correct one - http://www.ebay.com/itm/64-65-66-67-...item19cae9275dHere's an incorrect one - http://www.ebay.com/itm/1965-Chevy-2...item519becb667
Jim
Thread Starter
Instructor
Joined: Nov 2008
Posts: 125
Likes: 0
From: San Jose CA
A follow on question to this post. I got the new pump installed(first timer), filled coolant etc...
Fired her up to check leaks etc...all good so far. What I did notice is the water temp gauge pegged at 280. It didn't over heat or puke coolant anywhere. Now hours after its still at 280. I did some forum searches and found from John Z:
When it's pegged high, the circuit is shorted to ground; when it's pegged low, the circuit is open.
Is this a coincidence because I just replaced the water pump or could the water pump install have caused this?
thanks as usual,
Bob
Fired her up to check leaks etc...all good so far. What I did notice is the water temp gauge pegged at 280. It didn't over heat or puke coolant anywhere. Now hours after its still at 280. I did some forum searches and found from John Z:
When it's pegged high, the circuit is shorted to ground; when it's pegged low, the circuit is open.
Is this a coincidence because I just replaced the water pump or could the water pump install have caused this?
thanks as usual,
Bob
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Le Mans Master
Joined: Dec 2007
Posts: 8,000
Likes: 659
From: Puget Sound
Check the wire going to the sending unit on the intake manifold. Disconnect it from the sending unit and if the gauge now reads low, your sending unit is shot. If it still reads high, the wire is shorted to ground somewhere or the gauge has died.
Jim
Jim
Le Mans Master
Joined: Feb 2008
Posts: 5,214
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From: NJ Hockey beer league
I went that route years ago with an original pump. The rebuilder neglected to true the front hub on a lathe (like the better rebuilders do) so the pulley had a very slight wobble to it. Be sure to check for that.
Pilot Dan
Pilot Dan
Thread Starter
Instructor
Joined: Nov 2008
Posts: 125
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From: San Jose CA
Ok, disconnected the wire, turn the key to acc and it went back to zero. Put the wire back on and started it up. Seemed to work normal...slowly increasing as the engine warmed.
Now, as I let it idle for about 10min or so, revved it up to 2500-3000 a few times, it climbed to almost 240 degree's. How can I tell that my new water pump is actually working?
Bob
Now, as I let it idle for about 10min or so, revved it up to 2500-3000 a few times, it climbed to almost 240 degree's. How can I tell that my new water pump is actually working?
Bob
Drifting
Joined: Nov 2007
Posts: 1,513
Likes: 34
From: columbus ohio
do you have a infrared thermo gun? check the thermostat housing and make sure your
temp gauge is same as the thermo gun. some times the the gauge is not accurate and
your engine is fine. jmho jim
sorry if this has been asked before.
temp gauge is same as the thermo gun. some times the the gauge is not accurate and
your engine is fine. jmho jim
sorry if this has been asked before.