ENGINE SERVICE (Contd)
Coolant Surge Tank.
Extreme care should be taken when removing surge tank filler cap if temperature gauge reads above
175°F (79°C). Steam or hot coolant under pressure may cause injury.
Remove coolant surge tank filler cap (1). Visually check coolant level. Surge tank (2) should be filled to
approximately bottom end of filler tube (3) with engine cold, and slightly above with engine at normal operating
Have suitable container ready to catch liquid contaminants.
If surge tank on M939A2 series vehicles is found to be empty, open drainvalve on aftercooler and fill
surge tank. Close drain- valve when coolant is observed flowing from drain, and continue filling to
approximately bottom end of fill tube.
If coolant level is low, add coolant as necessary.
Run engine until temperature gauge (4) reads 175°-200°F (79°-93°C). Check and refill as necessary.
Power Steering Reservoir.
Do not overfill power steering reservoir. Oil will overflow into vent system.