PLATE 9V9341 - Caterpillar

Table 1
Maximum Inlet Manifold Air Temperatures for G3400 Engines
Aspiration Water Temperature Regulator Maximum Inlet Manifold Air Temperature
Naturally aspirated n/a 25 °C (77 °F) (1)
Separate Circuit Aftercooling 32 °C (90 °F) (2) 43 °C (110 °F)
Separate Circuit Aftercooling 54 °C (130 °F) (2) 65 °C (150 °F)
(1) This temperature is for an engine at an altitude of 152 m (500 ft) above sea level. A greater temperature or a higher altitude requires derating.
(2) Water inlet to the aftercooler
Inlet Manifold Air Pressure (TA Engines) and Inlet Manifold Vacuum (NA Engines) - For TA engines, this gauge indicates the air pressure (turbocharger boost pressure) in the air plenum (air inlet manifold) after the aftercooler. For NA engines, this gauge is the pressure of the inlet manifold vacuum. For all engines, this pressure is relative to the load. This pressure may be used for estimating power output. Several factors affect the inlet manifold air pressure. All of these factors must be accounted for when power is estimated from inlet manifold air pressure: air restriction, exhaust restriction, coolant temperature, ambient air temperature, variation of the fuel, air/fuel ratio, ignition timing and condition of the valves.For more information, see the performance curves in the Engine Performance manual. The manual is available from your Caterpillar dealer.
Tachometer - This gauge indicates the engine rpm.
An overspeed can result in serious damage to the engine. To help prevent engine damage, never allow the engine to exceed the rated rpm.
Note: The rated rpm is stamped on the engine Information Plate.
Service Hour Meter - This meter indicates the total number of service meter units that have been operated on the engine. Table 2 lists the factors for converting service meter units to clock hours.
Table 2
Factors for Converting Service Meter Units to Clock Hours
Operating Speed Factor
Engines That Are Rated From 1000 RPM to 1400 RPM
1000 rpm 1.200
1200 rpm 1.000
1400 rpm 0.857
Engines That Are Rated From 1500 RPM to 1800 RPM
1500 rpm 1.200
1600 rpm 1.125
1800 rpm 1.000 For example, an engine that is rated at 1800 rpm has been operating at 1500 rpm. To determine the number of clock hours, multiply the number of service meter units by the correct factor. In this example, one service meter unit is equivalent to 1.200 clock hours.
Fuel Filter Differential Pressure - This gauge is provided by the customer. This gauge indicates the difference in fuel pressure between the inlet side and the outlet side of the fuel filter. As the fuel filter element becomes plugged, the difference in pressure between the two sides of the fuel filter increases. Service the fuel filter when the fuel filter differential pressure reaches 34 kPa (5 psi).
Air Cleaner Differential Pressure - This gauge indicates the difference in air pressure between the inlet side and the engine side of the air filter element. The pressure is measured from the turbocharger air inlet. As the air filter element becomes plugged, the difference in pressure between the two sides of the air cleaner element will increase. For optimum engine