10-79. HEATER CONTROL CABLE AND SHUTOFF VALVE ADJUSTMENT
This task covers:
General mechanics tool kit:
automotive (Appendix B, Item 1)
Lubricating oil (Appendix C, Item 45)
Hood raised and secured (TM 9-2320-387-10).
General Safety Instructions
Ensure engine is cool prior to performing this
Perform the following procedure if the heater temperature control assembly is
difficult to operate. The repositioning of the heater temperature control cable
and heater shutoff valve will reduce cable bends and allow access for lubrication.
Ensure engine is cool prior to performing this procedure. Steam or hot
coolant under pressure can cause injury to personnel.
Push heater control knob (18) to OFF position.
Loosen two clamps (12) on hoses (13).
Rotate heater shutoff valve (1) and position heater shutoff valve lever (141 in the upward position.
Tighten two clamps (12) on hoses (13).
Loosen screw (11) and clip (101 and remove cable assembly (4) from heater shutoff valve<l).
Remove screw (51, washer (61, clamp (71, and crankcase depression regulator valve (8) from
mounting bracket (9).
Install crankcase depression regulator valve (81 on mounting bracket (9) with washer (61 and
Cut loop end (2) from spring wire (3). Cut as close to loop end (2) as possible.
Remove spring wire (3) from steel casing (161 and tube (15) by pulling heater control knob (18).
Remove any kinks in spring wire (3).
Remove a 5-in. (127.0-mm) section from steel casing (16).
Route steel casing (161 through clamp (201.
Install spring wire (3) into steel casing (16) and tube (15).
Position end of steel casing (1610.75 in. (19 mm) from clip (10) and install steel casing (16) on heater
shutoff valve (11 with clip (10) and screw (11).
Position heater control knob (18) 0.125 in. (3.18 mm) from instrument panel (17).
Turn spring wire (31 three turns around heater shutoff valve pin (211. Cut off any excess spring wire (3).
Pull out heater control knob (181 to ON position.
Apply lubricating oil to heater shutoff valve lever (141 and shutoff valve pin (21).
Apply lubricating oil to plunger (19).
Move heater control knob (18) to OFF and ON several times to distribute oil.
Check engine coolant level (TM 9-2320-387-10).
Start engine (TM 9-2320-387-10) and check heater shutoff valve (1) connections for leaks.