Control Valve Body

CONTROL VALVE BODY

Control Valve Body:

DISASSEMBLY



1. Remove oil strainer.




2. Separate lower body, separator plate and upper body.
Be careful not to scatter or lose orifice check valve, servo orifice check valve, or throttle relief check valve (ball) and related springs.

INSPECTION




A newly manufactured valve body represents precision manufactured valves assembled with close tolerances into precision bores of the valve body. If inspection reveals excessive clearances, 0.03 mm (0.0012 in.) or more, between the valves and the valve body bores, replace the entire valve body rather than attempt rework.

If one or more valves are sticking from varnish deposits or burns resulting from deteriorated oil or overheating, you may be able to clean the valves and valve bodies. Always use crocus cloth, which is a very fine type of cutting material. Never use emery cloth, as it is too coarse and can scratch the valves or valve bores. Scratches can lead to future deposits of varnish or foreign matter.

During cleaning, do not remove the sharp edges of the valve. When edges are rounded or scratched, dirt or foreign matter may enter into the sides of the valves and hinder valve movement.

The valves may be cleaned using alcohol or lacquer thinner. The valve bodies can be dip cleaned with a good carburetor cleaner or lacquer thinner. Do not leave valve bodies submerged in carburetor cleaner longer than five minutes. Rinse parts thoroughly and dry.

Lubricate all parts in clean A.T.F. before reassembly.
1. Check valves for signs of burning. Replace if beyond clean-up.
2. Check oil strainer for general condition. Replace if necessary.




3. Check separator plate for scratches or damage. Replace if necessary. Scratches or score marks can cause oil to by-pass correct oil passages and result in system malfunction.




4. Check oil passages in upper and lower valve bodies for varnish deposits, scratches or other damage that would impair valve movement. Check threaded holes and related bolts and screws for stripped threads; replace as needed.
5. Check valve springs for damage Measure free length of valve springs. If the free length is out of specification, replace it.
Numbers of each valve spring listed in table below are the same as those in the figure at the top.

ASSEMBLY

Lower Valve Body:

Upper Valve Body:

Orifice Check Valve:

1. Install orifice check valves, valve, springs, throttle relief valve spring and steel ball in valve body.




2. Assemble separator plate and upper valve body on lower valve body, then tighten bolts.
When installing these bolts, first be sure to install the two reamer bolts to their original positions.

3. Install oil strainer.