56 INSTRUMENTS AND CONTROLS 1. Manifold Pressure Gauge (If Equipped) – Measures the charge air boost pressure in the intake manifold. 2. Oil Pressure Gauge – Indicates engine oil pressure. The normal operating oil pressure for a MACK MP engine (at governed speed) is between 275.8 and 620.5 kPa (40 and 90 psi). At idling speed, the oil pressure should be between 275.8 and 413.9 kPa (40 and 60 psi). 3. Engine Oil Temperature Gauge (Only with MACK Engine) – Indicates the temperature of the engine oil. Note: At full-load operation, engine oil temperature can be approximately 250°F on a sustained basis, and can intermittently reach temperatures between 250°F to 270°F. Sustained temperatures of 250°F and intermittent temperatures up to 270°F are acceptable. However, if engine oil operation temperatures exceed 250°F more than 20% of the total engine operating time, and the oil has a minimum of 300 hours of service, the oil must be changed. Otherwise, the normal mileage/time oil change interval may be used. For the MACK recommended oil change intervals, refer to the Maintenance and Lubrication Manual (TS494). 4. Exhaust Pyrometer (If Equipped) – Indicates the temperature of exhaust gases (about 12 to 16 inches from the diesel particulate filter inlet connections). This helps the operator select the proper gear for load and grade conditions, thereby avoiding excessive exhaust temperatures.
CAUTION Do NOT exceed the maximum exhaust temperature indicated by the red line on the gauge. To reduce exhaust temperature, downshift or reduce engine power. If operating in cold climates with a winterfront, open the winterfront.
5. Transmission Oil Temperature Gauge (If Equipped) – Indicates transmission oil temperature.
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