Power Valve System

Power Valve Testing:

This first portion of this procedure requires and air cleaner temperature of less than 68° F (20.5° C).

1. Disconnect vacuum line #14 from vacuum manifold as shown.
2. Connect a vacuum pump to vacuum line #14, apply vacuum. If vacuum does not hold, power valve diaphragm is defective and must be replaced.

Power Valve Testing:

3. Start engine and connect vacuum gauge as shown.

Expected result:
No vacuum. If OK continue. If not OK, air cleaner mounted air bleed valve B is defective and must be replaced.


4. Allow engine to run until the cooling fan comes on. Check vacuum gauge.

Expected result:
Engine vacuum. If OK, test complete. If not OK, air cleaner mounted air bleed valve B is defective and must be replaced.