Spark Control System Servicing & Replacement Procedure

CTO VALVE, REPLACE

4-151, 6-258 & V8-360

1. Drain a sufficient amount of coolant from radiator to bring fluid level below CTO valve.
2. Identify and tag CTO valve vacuum hoses and disconnect hoses from valve.
3. Place a suitable drain pan directly below CTO valve and remove valve from thermostat housing.
4. Reverse procedure to install.



THERMAL VACUUM SPARK CONTROL VALVE, REPLACE

4-151

1. Identify and tag vacuum hoses and disconnect from valve.
2. Remove air cleaner cover and filter to expose valve and remove the valve.
3. Reverse procedure to install.