![background image](http://html1.mh-extra.com/html/mack/granite-gu-series/granite-gu-series_operators-handbook-manual_686197184.webp)
OPERATION 173
Engine Warm-Up
CAUTION
Idling the engine unnecessarily for long periods of time wastes fuel and fouls
injection nozzles. Unburned fuel causes carbon formation and oil dilution. NEVER
race an engine during warm-up.
Engine damage can occur if the engine is not warmed up to a minimum
operating temperature of 77°C (170°F) before putting the vehicle into full
operation.
Heavy-duty diesel engines are designed to operate at optimum efficiency
when they are running loaded at (or very near) normal operating temperature,
where efficient combustion takes place. When the engine is operated
unloaded, lightly loaded (i.e., stop-and-go operations, PTO operations, or
periods of extended engine idling) or in cold weather conditions, normal
operating temperature may not be achieved or maintained. As a result, carbon
and/or varnish build-up will occur and lubricating oil will become contaminated
with combustion by-products.
Cold weather operations place added demands on a diesel engine. When
operating in cold climates (particularly in stop-and-go operations, PTO
operations or periods of extended engine idling), minimum operating
temperature must be maintained to prevent engine damage resulting from
valve varnishing and carbon build-up.
Note:
Many accessories are available for cold weather operations. Refer to the
Maintenance and Lubrication Manual for additional information concerning cold
weather accessories.
Engine Idling
Idling the engine unnecessarily for long periods of time wastes fuel, fouls
injector nozzles and can lead to valve carbon and varnish deposits. Unburned
fuel causes carbon formation and oil dilution. Shut the engine down when
prolonged loading or unloading of cargo is required.
When starting a cold engine, or if the vehicle has been parked and the engine
coolant has fallen well below normal operating temperature, a fast idle speed
of approximately 1200 rpm should be maintained to help the engine warm
up more quickly.
Summary of Contents for Granite GU Series
Page 2: ......
Page 11: ......
Page 44: ...SAFETY INFORMATION 33 Advisory Label Locations On Vehicle Labels Found on Chassis C0029831 ...
Page 45: ...34 SAFETY INFORMATION C0028958 ...
Page 46: ...SAFETY INFORMATION 35 C0028959 ...
Page 47: ...36 SAFETY INFORMATION C0029013 1 Right Side Frame Rail 2 Hood Prop ...
Page 48: ...SAFETY INFORMATION 37 C0029014 ...
Page 49: ...38 SAFETY INFORMATION Labels Found on Driver Side Sun Visor C0029832 ...
Page 50: ...SAFETY INFORMATION 39 C0029016 ...
Page 58: ...SAFETY INFORMATION 47 C0029833 ...
Page 60: ...SAFETY INFORMATION 49 C0029834 ...
Page 62: ...SAFETY INFORMATION 51 C0029835 ...
Page 72: ...INSTRUMENTS AND CONTROLS 61 Panel B W3056238 ...
Page 81: ...70 INSTRUMENTS AND CONTROLS C0029141 ...
Page 82: ...INSTRUMENTS AND CONTROLS 71 Diagnostics W3036575 W3036576 W3036583 ...
Page 84: ...INSTRUMENTS AND CONTROLS 73 C0029144 ...
Page 113: ...102 INSTRUMENTS AND CONTROLS C0029240 C0029241 ...
Page 235: ...224 OPERATION C0029351 ...
Page 241: ...230 OPERATION C0029352 ...
Page 284: ...MAINTENANCE AND LUBRICATION 273 C0029851 C0029852 1 Towhook Access ...
Page 305: ...294 MAINTENANCE AND LUBRICATION C0029434 1 Front 2 Back ...
Page 317: ......