Model 801: 1957 Imperials and later
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is in line with guide on casting. Tighten spark plug cap attaching screws evenly and securely. Fit the rubber vent tube into the opening in the burner casting.
34. HEAT EXCHANGER AND OVERHEAT
SWITCH (Fig. 14)
Do not remove the heat exchanger unless it is defective and needs to be replaced or the overheat switch requires service. The heat exchanger has no operating parts and should only require replacement after prolonged use. If replacement should become necessary, it can be removed as follows: Loosen two clamps inside cover of heater housing and work the exhaust ferrule free. Be careful not to bend the mounting brackets in cover when removing the heat exchanger and shield assembly. Spread the shield assembly by hand and let the heat exchanger slide out the straight end. The overheat switch will then be accessible and can be removed from inside the shield if necessary.
Inspect the heat exchanger for evidence of leakage, dents, loose seams and interior condition. The inside of the heat exchanger will normally contain a deposit of lead and other products of combustion but this should not be regarded as a defect unless the coating is sufficient to cause a noticeable increase in the warm-up period of the heater. When such is the case, the heater can be restored to its original efficiency by installing a new heat exchanger. It is not recommended that any attempt be made to weld or otherwise repair the heat exchanger. Clean as much of the deposits from inside the exchanger as possible and blow it out with compressed air. Replace entire unit if it appears unserviceable after cleaning.
Inspect overheat switch in heat exchanger shield for broken porcelain, burned or broken wiring, loose or broken contact points or other visible damage. Replace switch if such conditions exist.
35. THERMOSTAT (Fig. 14)
If the. thermostat fails to control the duct outlet temperature, it is usually an indication that the cam is loose on the helix shaft or that end of helix has dropped out of slot in the control shaft. To correct this condition, adjust the thermostat as follows: Inspect the helix to make sure it is crimped tightly in the end of the control shaft. Fit the helix in slot and
crimp shaft with pliers if necessary. Leave thermostat on bench until the helix reaches room temperature if it was removed from a cold car. Loosen alien set screw in plastic cam on the base end of control shaft, making sure the shaft is completely free to revolve and take its normal position at room temperature (about 75 to 85° F.).
With the plastic cam free on the shaft and the micro-switch down, move the control cable linkage as far as it will go to the left and hold in this position. While holding the linkage, turn the plastic cam in a counter-clockwise direction until the micro-switch just clicks, then tighten the set screws in the cam.
Do not disturb the two screws which attach the micro-switch to the thermostat base.
When reinstalling the thermostat, insert the
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