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Discussion Starter · #1 ·
I have a '68 302 J-code.
I hear a high pitch sound coming from the water pump when
engine is running.
Therefore the pump need replacement.
I have on hand a pump with Ford part no. C5AE-8505-C.
I checked the book Ford Parts Interchange Manual and it
states this pump fits '67 Mustang with a 390 c.i.

Can I used this pump on my 302?

How difficult is it to replace a water pump?
 

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302 and 390 blocks are totally different and your water pump will not work. Are you sure the whine is coming from the water pump and not the power steering or alternator bearing?
 

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Discussion Starter · #3 ·
Can't tell 100% where the noise is coming from exactly.
Lately my engine is overheating a lot.
I flushed the radiator, heater core and the intake yesterday.
Water flows through with no restriction.
Blew compress air on heater core hoses, radiator and intake
to remove excess water.
Change the 160 degree thermostat to 190.
With the 190 degree t-stat, temp guage stays at 3/4.
Prestone coolant is 50/50 mix.
I will buy a new radiator cap and water pump tomorrow.

Are there other things I should check before I change the pump?
Is there a way to test if the water pump is malfunctioning?
 

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I am confused...If the engine is running hot, why did you go to a 190 degree thermostat.....This means that the engone temp. has to get to 190 before it get water flow....the 160 or a 180 would be my choice.
 

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Discussion Starter · #5 ·
I bought two 160 degree thermostat and both seems to get
the engine hot. I tested the thermostats in a pot of boiling
water to see if they open and close. Both did.
Unless its a fluke I bought two defective t-stat.

So what you are saying is to stick to 160 degree?
I will buy another 160 degree t-stat tomorrow.
I also need to drill a small hole on the collar of the t-stat right?
What is the hole for again? To release the air bubbles?

What could be causing the overheating then if not the water pump?
 

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There are three early water pumps for small block Ford and more for newer engines (reverse flow for 5.0L serpentine). The early ones are:

1. Cast iron (most commonly used on early 289/302 - has steel plate enclosing impeller cavity on back side).

2. Original aluminum (289 Hi-Po engines - this one requires special timing cover - has no steel plate and is open impeller type).

3. Aftermarket aluminum replacement for cast iron. (This pump replaces original cast iron pumps and has steel impeller cover on the back side - this pump will not fit on Hi-Po timing covers).
 

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Re: thermostats. Are you installing it in the correct direction? Springy end goes into manifold, pointy end goes towards radiator.
 
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