Kirby 37 - page 4

Kirby Morgan 37 & 57

Knob

Spring

Washer

Locknut

Bonnet

Valve stem

O-ring Washer

Side block

Stud

Bent tube

Seat

Plug

O-ring

Air Train

Gasket

5) The side block assembly is now u nfastened, but

held in place by the rubber sealing compound (silicone

sealant) that acts as a glue. It may be necessary to

rock just slightly, or pry the side block from the hel-

met shell. A thin putty knife can be pushed between

the side block and the helmet shell to help free it.

Do not use a screwdriver or chisel as damage to

the shell could result. Be sure to peel or scrape the

old silicone sealant away from both sealing surfaces

before reassembling. Acetone helps remove this, but

must be used sparingly since it will also remove the

Components of the Side Block & Air Train

ﬂat black ﬁnish inside the helmet.

6) If you plan to rebuild the side block assembly, it

sho uld b e do ne a t th is t ime , wh ile the side bloc k is off

the helmet. Overhaul the defogger valve and emer-

gen cy va lve i n a ccor da nce wit h th is c hap ter. Over hau l

the one-way valve in accordance with this chapter.

7.3.4 Side Block Assembly Replacement

If a new side block is being installed, make sure it

aligns correctly in the holes of the helmet shell before

applying RTV silicone sealant.

1) A generous application of silicone sealant must be

applied to the side block prior to installation on the

helmet shell. The sealant should sur round the stud,

alignment screw, and air inlet on the block. Use only

Dow Corning™ RTV 732 Multi Purpose sealant. This

work must be done a well-ventilated area.

Care must be taken to avoid sealant enteri ng the

air opening in the side block. Be sure to remove all

excess silicone sealant before it sets up. Lacquer

thinner can be used to dissolve uncured sealant, after

tightening.

2) Fit the side block to the helmet shell.

2) Th read the screw through the helmet shell and

lightly tighten into the side block body.

A thin putty knife helps to remove the side block.