Kirby 37 - page 7

Kirby Morgan 37 & 57

Side Block

Helmet

shell

Air Train

Gasket

Stud

Bolt

Bent Tube

Plug

Seat

Valve Stem

Bonnet

Washer

Knob

Spring

Nut

Teflon washer

O-ring

7.4.3 Reassembly of the Defogger Valve

Tools Required:

3/8 inch Slotted Flat Blade Screwdriver

13/16” Open End Attachment on Torque Wrench

Minimum recommended replacement parts during

overhaul:

Washers, O-rings

1) Screw in the new seat assembly until it is even with

the front of the side block body.

2) Next, install the Teﬂon® washer and O-ring onto

the stem.

3) Inser t the proper end of the stem into the seat

assembly and turn clockwise until the seat lightly

bottoms out. Leave the stem in place.

4) Lubricate the O-ring and install on the bonnet.

5) Slide the bonnet over the stem and thread the bon-

The Side Block assembly and it’s

associated parts.

net into the side block.

6) Tighten the bonnet with a torque wrench to 100

inch lbs.

7) P lac e th e new Teﬂon ® wash er a nd t he c ont rol k nob

on t he s tem and rot ate the ste m co unt ercl ock wis e un til

the seat assembly tops out fully open. T he control

knob must turn smoothly without any binding.

Binding (or “hard spots”) in the rotation could be

an indication of a bent stem that should be replaced.

Replace the knob and or stem if the ﬁt allows the valve

to rotate loosely more than 1/8th of a turn.

8) Install the new Teﬂon® washer, new knob, and

the spring, and locknut. Tighten the locknut until it

is ﬂush with the knob.