E 350 Van L6-300 4.9L VIN E 1-bbl (1982)
Vacuum Spark Delay Valve: Testing and Inspection
Fig.36 - SDV Valve Color Coding
Fig.37 - Spark Delay Valve (SDV) Specifications Chart
Refer to Figs. 36 & 37 for number value by color code.
NOTE: To perform the following procedure, an external vacuum source capable of maintaining a minimum constant 10 inches Hg. is required.
Mono Delay Valve
1. Set external vacuum source to 10 inches Hg. and connect black side of delay valve to vacuum source.
2. Connect a vacuum gauge with a 24 inch hose to colored side of delay valve.
3. Apply 10 inches Hg. vacuum and observe time in seconds for gauge to read 0-8 inches Hg. The minimum and maximum time for gauge to read 8
inches Hg. should be as shown in Fig. 37.
Dual Delay Valve
1. Set external vacuum source to 10 inches Hg. and connect vacuum gauge with a 24 inch hose to DIST nipple of delay valve.
2. Connect black side of delay valve and CARB nipple of delay valve to vacuum source.
NOTE: Avoid applying vacuum to CARB nipple while applying vacuum to black side of valve.
3. Apply 10 inches Hg. of vacuum and observe time in seconds for gauge to read from 0-8 inches Hg. The minimum and maximum time for gauge to
read 8 inches Hg. should be as shown in Fig. 37.
Retard Delay Valve
1. Set external vacuum source to 10 inches Hg. and connect colored side of delay valve to vacuum source.
2. Connect a vacuum gauge with a 24 inch hose to white side of delay valve.
3. Apply 10 inches Hg. of vacuum and observe time in seconds for gauge to read from 0-8 inches Hg. The minimum and maximum time for gauge to
read 8 inches Hg. should be as shown in Fig. 37.
