Service Tool
A service tool may be fabricated from a known good service regulator valve to simulate the entire system air input into the fuel air mixture. This will prevent the possibility of performing carburetor adjustments to compensate for a smog ventilation system that is not operating properly, or rough or loping engine idle complaints being incorrectly diagnosed as smog reduction system malfunction. To fabricate regulator valves for test purposes, obtain service regulator valves for six cylinder and eight cylinder engines and rework them as follows: Disassemble the valve. Interchange the position of the valve spool and the spring, then assemble the valves in the order shown in illustration and identify valves for respective engine usage.
NOTE:
These valves should not be used as replacement parts.