A few screws out and this is what you'll see:
If you have one of the first two hundred coaches, the one relay (black/rusted boxes) on the left was originally used to control the lavatory light and 'Occupied' sign.The relay on the right, triggered by closing the restroom door, ran the high speed blower by bypassing the resistor in the circuit. But after 20% of the order was built, the engineers and management decide they needed to run the low speed blower continuously through this relay instead. The earlier coaches may have been retrofitted with the new circuitry.
The round device is the water pump limit switch. This was a clever component wired in series to the water pump motor. When the water pump switch was pressed (no faucets here!), this rotary switch gave about 15 seconds of water, then shut off. It would then take about 18 seconds for the probably bi-metal element to cool and the pump could operate again. This helped conserve water and prevent overflows.
The two relays were part of the circuits to run either the low speed blower continuously or the high speed blower when the door was latched. As the maintenance manual put it delicately: "Ventilator blower ... forces objectionable odors from the lavatory compartment to outside of coach."
These relays are identical Delco-Remy 1116852s. Prying off the metal cap carefully reveals the coil, points and terminals. A bit of wire wheel work on both cap and terminal produces the intended results:
Next comes the cleaning of the points and some adjustments, before painting the cover with gloss black paint. Then back to the second relay, then take a look at the limit switch. Not sure what to do with it besides leave it alone!
Specs for the 1116852 are these:
Make Delco-Remy
Air Gap (with points closed) 0.022"
Point Opening 0.030"
Closing Voltage 7.0 Min.
Sealing Voltage 9.0 Max.After a couple of light coats of gloss black enamel, it's looking pretty good, especially for a first effort.
More later!
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