166 OPERA TION

Priming the Fuel System

Danger

Before working inspecting a vehicle, set the parking brakes, place the transmission neutral and block the wheels. Failure can result unexpected vehicle movement and can cause serious personal injury death.

Danger

T o avoid potential fire hazard, not service any part the fuel system while smoking the presence flames, sparks hot surfaces, when working operating engine. Failure follow these precautions can result fire. T o guard against burns from direct contact with hot fuel, wear adequate protective clothing (face shield, heavy gloves and apron, etc.) when working a hot engine.

Warning

NOT work near the fan with the engine running. The engine fan can engage any time without warning. Anyone near the fan when turns could seriously injur ed. Befor e turning the ignition, sur e that one near the fan.

Pump the hand primer until the force pumping

Note: When the fuel system empty , 200 more pump strokes may needed properly prime the system.

Note: There are bleed nipples opened order prime the fuel system.

Lock the hand primer pump retracting into the housing and turning

Start the engine and run increased idle speed for approximately 5 minutes remove any remaining air the system.

Check the fuel system for leaks.

Note: the engine does not start following this contact your local MACK dealer

Unlock the hand primer pump pushing the pump handle and turning counterclockwise.

Caution

Idling the engine unnecessarily for long periods time wastes fuel and fouls injection Unburned fuel causes carbon formation and oil race engine during warm -

Engine damage can occur the engine not warmed a minimum operating temperature 77°C (170°F) before putting the vehicle into full

Heavy - duty diesel engines are designed operate optimum ficiency when they are running loaded (or very near) normal operating temperature, where ficient combustion takes place. When the engine operated unloaded, lightly loaded (i.e., stop - andoperations, O operations, periods extended engine idling) cold weather conditions, normal operating temperature may not achieved maintained. a result, carbon and/or varnish build - will occur and lubricating oil will become contaminated with combustionproducts.

Cold weather operations place added demands a diesel engine. When operating cold climates (particularly stop - andoperations, O operations periods extended engine idling), minimum operating temperature must maintained prevent engine damage resulting from valve varnishing and carbon buildup.

Note: Many accessories are available for cold weather Refer the Maintenance and Lubrication Manual (TS494) for additional information concerning cold weather

Engine Idling

Idling the engine unnecessarily for long periods time wastes fouls injector nozzles and can lead valve carbon and varnish Unburned fuel causes carbon formation and oil Shut the engine down when prolonged loading unloading cargo

When starting a cold engine, the vehicle has been parked and the engine coolant has fallen well below normal operating temperature, a fast idle speed approximately 1200 rpm should maintained help the engine warm more quickly .

Shutting Down the Engine Standard Shutdown

After a hard allow the engine idle three minutes before shutdown order stabilize the temperature all engine Quick shutdowns can cause engine damage and prevent the turbocharger from being properly

Caution

Operating the engine below normal operating temperatur e for extended periods time will allow varnish/carbon deposits build the valve stems and guides. This will cause the valves stick the guides after the engine has been shut down and could r esult push r damage when the engine r estarted. the engine has been operated below normal operating temperatur e for extended period time (and the odor raw diesel fuel detected unburned fuel can seen the exhaust stack), the engine should operated under until normal operating temperatur e achieved BEFORE shutting down the engine.

chassis equipped with air starter , make sure that the air pressure gauge reads a maximum 120 psi before shutting down and parking for the night. This will ensure suf ficient air pressure for restarting the engine.

V - MAC Shutdown Option: Idle Cooldown

This feature provides a means cooling down the engine and turbocharger the idle cooldown option enabled using VCADS Pro MACK Support Software and the system senses that the turbocharger may the engine will not shut down when the vehicle the parking brake set and the key switch turned the OFF This feature allows the driver lock the truck and walk away while still providing adequate All switched accessories will then turn f once the engine has this option the engine can shut down immediately cycling the key switch pressing the shutdown override a pyrometer the idle cooldown function will use the pyrometer shutting the engine down when the temperature drops below 232°C (450°F), after whichever comes

The idle cooldown timer set 3.5 minutes soon the engine load exceeds 25%, provided that the engine has been running least seconds. After the load drops below 25%, the timer begins counting down. the key switch turned f before the timer expires, the engine will continue run until the timer reaches zero.

The default for this option set OFF from the factory .