M11 Series – Service Manual – 006-036   STC Oil Control Valve (Electrical)

Install a Compuchek® fitting, in the side of the electronic step timing control solenoid valve body and then connect a gauge to that location to monitor the oil pressure.

The second method is to use service tool, ST434-2, and a pressure gauge to plumb the oil feed line that sends engine oil to the overhead, and then check the operation of the electronic step timing control valve under various loads and speeds to make sure the valve is switching.

Remove the oil feed line. Refer to Procedure 006-068.

Disconnect the electronic step timing control solenoid and module. Refer to Procedure 019-043 in the Troubleshooting and Repair Manual, Centry Fuel System, Bulletin 3666070.

Remove plug, from the electronic step timing control assembly.

Remove the step timing control shutoff valve assembly.

Remove the o-ring from the groove in the step timing control shutoff valve assembly (12-VDC), or shutoff valve (32-VDC), and lock washers.

Remove the capscrews.

Remove the o-ring from the step timing control adapter block o-ring groove on the block.

Remove the step timing control adapter block, block capscrews, and washers.

Use an ohmmeter. Check the resistance of the solenoid.

If the resistance is not within specifications, the solenoid must be replaced. Refer to Fuel Pump PT (Type G) Rebuild and Calibration Manual, Bulletin Number 3379084.

Lubricate the o-ring. Place the o-ring in the step timing control adapter block o-ring groove on the block.

Make sure the word UP is stamped on the adapter block and is facing upward when the adapter block, onto the block using two capscrews, and washers.

Lubricate the o-ring. Place the o-ring into the groove in the step timing control shutoff valve assembly (12-VDC), or shutoff valve (32-VDC).

Install the step timing control shutoff valve assembly onto the adapter block using two capscrews, flat washers, and lock washers.

Use clean engine oil to lubricate the o-ring (7). Install the o-ring (7) into the valve body. Install the following parts onto the bracket:

• Valve body (5)
• Cover (4)
• Four capscrews (3).

Tighten the capscrews.

• Install the 90 degree elbow check valve. Refer to Procedure 006-032.
• Connect the electronic step timing control solenoid. Refer to Procedure 019-043 in the Troubleshooting and Repair Manual, Centry Fuel System, Bulletin 3666070.
• Install the oil feed line. Refer to Procedure006-068.
• Perform initial check in this procedure, to verify proper operation.