K 1500 Truck 4WD V8-350 5.7L (1986)
Vacuum Regulator Valve: Service and Repair
REPLACE
A solid type pressure regulator valve must be used only in a pump cover with a "Squared On" (machined) pressure regulator boss. A pressure regulator
valve with oil holes and an orifice cup plug may be used with either type pump.
1. Remove bottom pan and strainer.
2. Using a screwdriver or steel rod, compress regulator boost valve bushing against pressure regulator spring. Pressure regulator spring is under extreme
pressure and will force valve bushing out of bore when snap ring is removed if valve bushing is not held securely.
3. Continue to exert pressure on valve bushing and remove snap ring. Gradually re ease pressure on valve bushing until spring force is exhausted.
4. Carefully remove regulator boost valve bushing and valve, and pressure regulator spring. Be careful not to drop parts as they will fall out if they are
not held.
5. Remove pressure regulator valve arid spring retainer. Remove spacers if present.
6. Reverse procedure to install.
