Overheating - Pulled Water Pump - Need Assistance - Team Camaro Tech
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post #1 of 62 (permalink) Old May 31st, 14, 10:51 AM Thread Starter
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Overheating - Pulled Water Pump - Need Assistance

Background: 1969 Camaro, running a 350 sbc, aluminum radiator with electric fan (sucking air from grill inwards), 180 degree thermostat. While driving, I tend to start overheating quite quickly. Within 5 minutes my my drive, i reach 180 degrees, within 20 minutes i am about 200, and if I am idling in traffic at 200, I will reach about 220-225 within 4-5 minutes.

To find the bottom of my over heating problem, I pulled my water pump to see whether it could be a counterclockwise rotation on a v-belt system.

Are you able to tell by the picture whether the water pump i have is the correct water pump for my application? I run the belt on the grove side of the pulley and the pump pulley rotates clockwise (looking from in front of the car).

That being said, the water pump is a generic china brand, Dynapak np1063, I couldn't find more details, other than there is a "B" casted in the inside of the water pump housing. *see image* Can you recommend a good water pump replacement, american made?

Thanks

https://www.dropbox.com/s/lihd2fztdt...531_094530.jpg
https://www.dropbox.com/s/8aickcoph2...531_094538.jpg

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post #2 of 62 (permalink) Old May 31st, 14, 02:45 PM
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Smile Re: Overheating - Pulled Water Pump - Need Assistance

Stewart makes the best waterpump. http://stewartcomponents.com/

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post #3 of 62 (permalink) Old May 31st, 14, 02:46 PM
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Re: Overheating - Pulled Water Pump - Need Assistance

Front pict, could be handy, heater hose fittings are diffrent, did heating problems start after pump change???
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post #4 of 62 (permalink) Old May 31st, 14, 04:24 PM Thread Starter
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Re: Overheating - Pulled Water Pump - Need Assistance

pump hasn't been changed, i am running the same pump i bought 4 years ago when engine was made.


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post #5 of 62 (permalink) Old May 31st, 14, 09:11 PM
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Re: Overheating - Pulled Water Pump - Need Assistance

Pump looks clean and not chewed up. Clockwise rotation right?
Do you get heat out of the heater core with this pump? If so I would say its doing its job but you would need to do a flow test.

With the cap off and thermostat open do you get full flow through the radiator core?


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post #6 of 62 (permalink) Old May 31st, 14, 09:43 PM Thread Starter
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Re: Overheating - Pulled Water Pump - Need Assistance

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Originally Posted by 69-Pace View Post
Pump looks clean and not chewed up. Clockwise rotation right?
Do you get heat out of the heater core with this pump? If so I would say its doing its job but you would need to do a flow test.

With the cap off and thermostat open do you get full flow through the radiator core?
i dont know which rotation my water pump is, but the pulley is rotating it clock wise since i am running a vbelt config with no ac, and alternator on the passenger side.

I havent connected the fan to see if the heater core provides heat.

the tstat is 180, is it safe to pull the cap at 180 degrees to check the flow, because the flow will only start after the tstat has hit 180+ degrees..

or should i pull the tstat, run the car with no tstat to check the flow/waterpump?

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post #7 of 62 (permalink) Old Jun 1st, 14, 01:05 AM
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Re: Overheating - Pulled Water Pump - Need Assistance

Heats up at idle and runs over warm at cruise.
1st thing u do is the easy stuff
1/ Squeeze the bottom hose, is it soft or can u feel the reenforcing spring inside?.. The pump can suck this hose closed at highway cruise.. so doent explain the hot idle.

2/buy a new thermostat.. they are cheap...test it in a jug of water ....pull the old one out put the new one in... check the old one in the jug its working.. if it jambs , doesnt fully open At correct temp... chances are problem fixed.
3/long shot.. seen this once.. the impeller in the pump has come loose on the pump shaft splines
4/ leaking head gasket.. run a COx / hydrocarbon test on the radiator....most workshops do this for free here...takes mins tops.
5/got a hole heap of cores blocked in the raditor.. going from pics , dont think thats very likely thu.

My Spelling is not incorrect...it is creative

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post #8 of 62 (permalink) Old Jun 1st, 14, 03:46 AM
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Re: Overheating - Pulled Water Pump - Need Assistance

Quote:
Originally Posted by Camaro1969 View Post
i dont know which rotation my water pump is, but the pulley is rotating it clock wise since i am running a vbelt config with no ac, and alternator on the passenger side.

I havent connected the fan to see if the heater core provides heat.

the tstat is 180, is it safe to pull the cap at 180 degrees to check the flow, because the flow will only start after the tstat has hit 180+ degrees..

or should i pull the tstat, run the car with no tstat to check the flow/waterpump?
Vic - Clockwise is the direction that would force the flat side of th impeller to move water so that is okay.

Does the heater box get warm to the touch, or the heater hoses at the firewall?

NO IT IS NOT SAFE to remove the cap when the vehicle is at operating temp. You have to start the vehicle with the cap removed. Then observe. Then shut down and cap.

As suggested buy a new one and test it on the stove with a candy thermometer. The thermostat should be fully open just around or just past the 180 point. Then swap it with your existing one.


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post #9 of 62 (permalink) Old Jun 1st, 14, 06:44 AM
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Re: Overheating - Pulled Water Pump - Need Assistance

Have you confirmed your fans are turning in the right direction?

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post #10 of 62 (permalink) Old Jun 1st, 14, 10:52 AM Thread Starter
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Re: Overheating - Pulled Water Pump - Need Assistance

Steptoe, I will test your 4 steps when i get the water pump back on the car.

69-pace, I will also test when the water pump is back on the car.

vega$69, yes the fan is sucking air from the outside, and bringing it through the radiator. The fan runs at all time, regardless of the temp. Fan sucks quite a bit of air.

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post #11 of 62 (permalink) Old Jun 1st, 14, 12:38 PM
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Re: Overheating - Pulled Water Pump - Need Assistance

is this a new build?
new water pump on an old engine?
has this been an ongoing problem or did it just start
did you just add the electric fans and now have the problem
give us all the info you can to help solve your problem
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post #12 of 62 (permalink) Old Jun 1st, 14, 12:44 PM Thread Starter
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Re: Overheating - Pulled Water Pump - Need Assistance

Quote:
Originally Posted by flat tire View Post
is this a new build?
new water pump on an old engine?
has this been an ongoing problem or did it just start
did you just add the electric fans and now have the problem
give us all the info you can to help solve your problem
The water pump was new when the engine was rebuilt, about 4 years ago.

Been driving the car for past 2 years, over heating has been issues since i started driving it. Electric fan has been on the car from beginning.

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post #13 of 62 (permalink) Old Jun 1st, 14, 01:05 PM
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Re: Overheating - Pulled Water Pump - Need Assistance

How big is the electric fan?? How many CFM's ?? I would put back the stock set-up. Here is some info on our sister site Team Chevelle:http://www.chevelles.com/forums/showthread.php?t=623546

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post #14 of 62 (permalink) Old Jun 1st, 14, 01:16 PM
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Re: Overheating - Pulled Water Pump - Need Assistance

Quote:
Originally Posted by Camaro1969 View Post
The water pump was new when the engine was rebuilt, about 4 years ago.

Been driving the car for past 2 years, over heating has been issues since i started driving it. Electric fan has been on the car from beginning.
GM engineers designed the cooling system with a specific radiator for maximum fluid flow, sealed fan shroud for maximum air flow through the radiator for cooling, a fan blade driven from the water pump which does not inhibit the flow of air like an electric fan mounted to the radiator does. It actually worked from the factory. Never understood why people add this aftermarket stuff and wonder why it doesn't work!

Do yourself a favor, ditch the electric fan, put a factory fan shroud on it, and install a stock 7 blade fan w/thermal clutch on the water pump. Betcha it will stay cool!

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post #15 of 62 (permalink) Old Jun 1st, 14, 02:15 PM Thread Starter
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Re: Overheating - Pulled Water Pump - Need Assistance

current rad set up. Has a shroud. 16 inch fan.


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