Operators Manual

Table Of Contents
Checking the Coolant Level (Hot Check)
Check the coolant levels as follows:
1. Allow the engine to run for approximately five minutes at a moderate speed.
2. After the coolant temperature reaches 50°C (122°F), recheck the coolant
level in the surge tank.
WARNING: HOT COOLANT
To avoid scalding from the expulsion of hot coolant, never remove
the cooling system pressure cap while the engine is at operating
temperature. Wear adequate protective clothing (face shield,
rubber gloves, apron, and boots). Remove the cap slowly to
relieve pressure.
3. Add more coolant if necessary. Open the heater valves before adding
coolant.
4. Do not close the heater valves until the engine has been running briefly and
the coolant level is again checked and corrected as necessary.
Monitoring the Engine Operation
While the engine is operating, monitor the battery charge indicator light and the oil
pressure. Excessive idling should be avoided.
Monitoring the Battery Charging System
The battery charge indicator light must go out once the engine starts. If the
indicator light comes on while the engine is running, do the following:
1. Shut down the engine.
2. Test the charging system, per OEM guidelines.
WARNING: BATTERY EXPLOSION
To avoid injury from battery explosion when jump starting the
engine, do not attach the cable end to the negative terminal of the
disabled battery.
3. If necessary, visit the nearest authorized dealer to have the alternator voltage
and output checked.
4. Do a load test on the batteries.
5. Replace components as needed.
DD Heavy Duty Platform Operators Manual
All information subject to change without notice. 53
DDC-SVC-MAN-0189 Copyright © 2022 DETROIT DIESEL CORPORATION