Upper Control Valve Body Overhaul

NOTICE:
- Each valve should slide in/out under its own weight.
- When a valve will not slide in/out under its own weight, depending on the valve, push it out with a wire or replace the valve body open-side down and lightly tap it with a soft hammer.
- If a valve surface or bore is scratched or damaged, replace the control valve body.
- Do not drop or lose the valves or internal parts.
- Before assembly, make sure all parts are thoroughly clean.
- Apply ATF to all parts and bores.
- Note the proper direction of the valves and internal parts.
- Do not reuse any part that has been dropped.
- Wrap a screwdriver or rod with tape before using it to insert a valve.

DISASSEMBLY

1. Disassemble in the order shown.

INSPECTION

1. Inspect all parts and repair or replace as necessary.





2. Measure the spring free lengths.
3. If not within specification, replace the spring(s).

Throttle Spring:
Outer Diameter - 0.213 inch (5.4 mm)
Free Length - 1.819 inch (46.2 mm)
Number Of Coils - 31.0
Wire Diameter - 0.035 inch (0.88 mm)
Throttle Assist Spring:
Outer Diameter - 0.203 inch (5.15 mm)
Free Length - 1.058 inch (26.88 mm)
Number Of Coils - 16.2
Wire Diameter - 0.024 inch (0.6 mm)
Throttle Modular Spring:
Outer Diameter - 0.319 inch (8.1 mm)
Free Length - 1.709 inch (43.4 mm)
Number Of Coils - 10.5
Wire Diameter - 0.031 inch (0.8 mm)

ASSEMBLY

NOTE: Assemble in the reverse order of disassembly.





1. Insert the throttle modulator spring, throttle modulator valve, and stop plug, then secure them with the stop pin.





2. Insert the throttle adjust plug, throttle assist spring, throttle valve, throttle spring, and throttle plug assembly.