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Assembly of the Valve Box Assembly
Lapping Oversize Valve into Valve Box
VALVE LAPPING
ARBOR
Figure 1
VALVE
KEEP FREE
OF LAPPING
COMPOUND
Figure 2
VALVE BOX
FRONT SECTION
Figure 3
VALVE BOX
FRONT SECTION
1/8"
PRESS DOWEL PIN IN
TO THIS DIMENSION
Figure 4
MAINTENANCE SECTION
VALVE
TIGHTEN SCREW SLIGHTLY
TO RETAIN VALVE ON ARBOR
VALVE BOX
REAR SECTION
B C C
VALVE
KEEP FREE OF
LAPPING COMPOUND
VALVE BOX
REAR SECTION
CLEAN HOLES WITH
1/32" DRILL
(Dwg. TPB130)
1. An oversize Valve (2) must be lapped into the Valve
Box. Use Grade 320 lapping compound and proceed
as follows:
a. Install the Valve on the No. 29189 or No. 29407
Valve Lapping Arbor as shown in Figure 1.
b. Apply lapping compound to diameter "C" only;
keep diameter "B" free of compound at all times.
Insert the compound–coated end of the Valve into
the rear section of the Valve Box as shown in
Figure 2 and lap until a free fit is obtained.
c. Wipe all compound from the Valve and from
internal diameter "B" in the Valve Box. Allow the
compound to remain on internal diameter "C".
d. Install the front section of the Valve Box and
Valve on the Arbor as shown in Figure 3.
e. Apply compound to Valve diameter "A" and lap
the small end of the valve to a free fit in the front
section.
f. Slide the rear section of the Valve Box over the
Valve and assemble it on the front section as
shown in Figure 4. Lap the Valve until it fits
freely in the assembled Valve Box.
2. Disassemble the Valve Box, clean the air ports with a
1/32" drill and wash the Valve and both sections of
the Valve Box in suitable solution to remove all trace
of the compound.
3. Apply 6 or 8 drops of light oil to the external surface
of the Valve and assemble it with the Dowel Pin (1) in
the Valve Box. Shake the assembly to see that the
Valve moves freely in the Valve Box.
Assembly of the Throttle Mechanism
Clamp the handle of the Riveting Hammer in
leather–covered or copper–covered vise jaws with the
Air Inlet Bushing (26, 33, 45) upward.
For Offset Handle Models
1. With a new Throttle Valve Seal (16) on the Throttle
Valve Assembly (15), place the Valve Assembly into
the Handle, Seal upward.
2. With the stem of the Throttle Adjusting Screw (19)
going through the Throttle Valve Spring (17),
install the Spring/Screw into the Handle.
3. With a new Throttle Adjust Sleeve Seal (24) on the
Throttle Adjuster Sleeve (23), place the Sleeve into
the Throttle Adjuster Body (18).
4. Carefully place the Throttle Adjuster Stop Spring (20)
and the Throttle Adjuster Stop Ball (21) in the
Throttle Adjuster Body.
5. Secure the Spring/Ball with the Throttle Adjuster
Knob (22) and the Throttle Adjuster Cap Screw (25).
6. Secure the Throttle Adjuster Screw with the Throttle
Adjuster Body.
7. Reinstall the Air Inlet Bushing (26).
24
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