Cleaning And Lubricating; Reassembly Of The Defogger Valve - Kirby Morgan KMB-18 A/B Operation And Maintenance Manual

The defogger valve components (83 through 92)
are disassembled as follows:
1) First, unscrew the locknut (83) with the slotted
screwdriver and remove the spring (84), control
knob (85), and washer (86).
Fig. 6.34 Removal of the free flow knob.
2) Next, unscrew the bonnet (87). Its O-ring (88)
will come off with it. The valve stem (91), O-ring
(90), and washer (89) usually come out with the
bonnet (87) and can be pushed out of the bonnet
(87) once removed from the side block body (94a/
b).
Fig. 6.35 Removal of the valve bonnet.
3) If the stem (91) remains in the side block body
(94a/b) it can be lifted out after the bonnet (87) is
removed.
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KMB 18 & 28 MANUAL
4) The seat assembly (92) can be unscrewed from
the side block body (94a/b) with the stem (91) or
a screwdriver.
Fig. 6.36 The seat should be removed from the sideblock for
inspection.

6.6.2 Cleaning and Lubricating

1) Clean all the metal parts in a dilute solution of
white vinegar. Rinse in fresh water.
2) Check the plastic seat (92) for wear, and
replace if necessary.
3) The Teflon washer (89) and O-ring (90) must
be replaced if worn. Replace the O-ring (88) if
worn.
4) Be sure to place a light coating of silicone
grease on all internal moving parts, O-rings, and
washers.

6.6.3 Reassembly of the Defogger Valve (83

through 92)
1) Screw in the seat assembly (92) until it is about
even with the front of the side block body (94a/b).
2) Next, install the O-ring (90) and washer (89)
onto the stem (91).
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