Saturday, February 15, 2014

Ranco heater control valve reseal

Continuing on towards the goal of getting the car to run under its own power, I need to button up the cooling system. Since Studebakers get interior heat from the cooling system, I have one last piece to repair before installing heater hoses: the heater control valve.

Here's what the beast looks like:

The valve works off a dash-mounted cable, which moves a plunger in and out of the tubes, blocking the flow of water to the heater and defroster cores. There's only one part to replace by this process--a rubber seal--but you have to take the thing apart to do it. Let's get started.

First, we remove the spring off the back:

Then the clip that holds the plunger against the controlling arm that moves it up and down.

After that, it is a matter of straightening out a series of tabs to separate the housing from the valve--here's the top section after it has been removed. The large, black disc on the right side is a rudimentary automated temperature control, which expands and contracts, adjusting the valve to regulate the temperature.

The seal is on the left side--looks like it has leaked before.
 A few more tabs, and the diaphragm is removed:

Still more tabs to remove to get access to the valve.

Looks a little better after a little touch up with a wire brush.
Now that we have access, we can pull off the clip, the bell-shaped cover and the remains of the diaphragm, and remove the valve.

Then it was time for a thorough cleaning. A little more wire brush action, some emery cloth on the mating surfaces, and it was time for reassembly.

Here's the valve in place with the new diaphragm in place:

Then the temperature regulator is put in place...

Followed by the lower case, clip, and spring. Now I just need to find 2 number ten sheet metal screws to mount it to the firewall. Since this is all hidden by the dash and protected from the elements, I didn't bother to paint it--chances are I'll have to replace that valve again in a few years anyway.

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