Thermo King T-500R Maintenance Manual page 160

d. If the rocker arms are tight, the engine is at top dead center of the exhaust stroke for the number one cylinder. Rotate
the engine 360 degrees to place the engine at top dead center of the compression stroke for the number one cylinder.
5. Disconnect the 8S wire from the starter solenoid to prevent the engine from cranking when the unit is turned On.
6. Energize the fuel solenoid and the fuel pump by turning the unit On (or using the Service Test Mode, see the appropriate
Microprocessor Diagnostic Manual).
7. Rotate the engine backwards (counterclockwise viewed from the water pump end) until the injection timing mark is
positioned about 1.0 in. (25 mm) below the timing mark on the starter mounting plate.
8. Use a clean towel to remove the fuel from the top end of the delivery valve holder.
9. Slowly turn the engine in the normal direction of rotation until you see the fuel rise in the end of the delivery valve holder.
Stop as soon as you see the fuel rise.
10. Check position of the timing marks. The 16 degrees BTDC timing mark on the flywheel should be aligned with the timing
mark on the starter mounting plate. Repeat steps 7 through 10 to recheck the timing.
11. If the timing is off by more than 1 degree (0.1 in. [2.5 mm]), loosen the mounting nuts on the studs that fasten the injection
pump to the engine and rotate the injection pump to change the timing.
a. Pull the top of the injection pump away from the engine to advance the timing.
b. Push the top of the injection pump toward the engine to retard the timing.
12. Tighten the injection pump mounting nuts and recheck the timing. Repeat steps 7 through 12 until the timing is correct.
13. Install the delivery valve spring for the number one cylinder by removing the delivery valve holder, installing the delivery
valve spring, and then reinstalling the delivery valve holder.
14. Install the injection line for the number one cylinder, the cylinder head cover, tighten the other injection lines, and reconnect
the 8S wire to the starter solenoid when finished with the procedure.
1. Delivery Valve Holder
Injection Pump
1
1. 16 Degrees BTDC Mark (Correct Timing Mark)
2. 20 Degrees BTDC
3. 15 Degrees BTDC
4. Index Timing Mark on Starter Mounting Plate
Correct Injection Timing Mark Alignment
Engine Maintenance
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2
3
4
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