811901 Force CAP ASSY., COMM END (STARTER 50-819271)

Measurement Of Pressure In Inlet Manifold
Table 1
Required Tools
Part Number Part Description Qty
1U-5470
or
198-4240 Engine Pressure Group
or
Digital Pressure Indicator 1 The efficiency of an engine can be checked by making a comparison. Compare the pressure in the inlet cover and the information in the Technical Marketing Information (TMI).This test is used when there is a decrease of horsepower from the engine, yet there is no actual sign of a problem with the engine.The correct pressure for the inlet manifold is also given in the Technical Marketing Information (TMI), "Fuel Setting and Related Information". These standards are established under the following conditions:
99 kPa (29.7 In Hg) dry barometric pressure
29 °C (84 °F) outside air temperature
35 API rated fuelAny change from these conditions can change the pressure in the inlet manifold. The outside air may have a higher temperature and a lower barometric pressure than the values that are given above. This will cause a lower inlet manifold pressure measurement than the pressure in the TMI. Outside air that has both a lower temperature and a higher barometric pressure will cause a higher inlet manifold pressure measurement.A difference in fuel density will change horsepower (stall speed) and boost. If the fuel is rated above 35 API, the pressure in the inlet manifold can be less than the pressure that appears in the TMI. If the fuel is rated below 35 API, the pressure in the inlet manifold can be more than the pressure that appears in the TMI. BE SURE THAT THE AIR INLET OR THE EXHAUST DOES NOT HAVE A RESTRICTION WHEN YOU ARE MAKING A CHECK OF THE PRESSURE.Note: The electronic service tool may be used to check the pressure in the inlet manifold.
Illustration 1 g00295554
1U-5470 Engine pressure group
Illustration 2 g00298478
Pressure test location
(1) Air temperature sensor for the inlet manifold
(2) Pipe plug for the air boost
(3) Boost pressure sensor To check the inlet manifold's pressure, remove the pipe plug for the air boost (2). It is not necessary to remove the sensor for the inlet manifold air temperature (1) and the boost pressure sensor (3).The 1U-5470 Engine Pressure Group can be used to check the pressure in the inlet manifold.The 1U-5470 Engine Pressure Group has a gauge that indicates pressure inside the inlet manifold. Refer to Special Instructions, SEHS8907 which is included with the engine pressure group for complete instructions. Refer to Operation Manual, NEHS0818, "Using the 198-4240 Pressure Indicator Tool Gp" for the instructions that are needed to use the 198-4240 Pressure Indicator Tool Gp.Measurement Of Exhaust Temperature
Table 2
Required Tools
Part Number Part Description Qty
1U-8865 Infrared Thermometer 1 When the engine runs at low idle, the temperature of an exhaust manifold port can indicate the condition of a unit injector.A low temperature indicates that no fuel is flowing to the cylinder. An inoperative unit injector pump could cause this low temperature.A very high temperature can indicate that too much fuel is flowing to the cylinder. A malfunctioning unit injector could cause this very high temperature. Use the 1U-8865 Infrared Thermometer to check this exhaust temperature. You can find operating instructions and maintenance instructions inside the Operator's Manual, NEHS0510, "1U-8865 Infrared Thermometer".Air-to-Air Aftercooled Systems
Table 3
Required Tools
Part Number Part Description Qty
FT-1984 Air-to-Air Aftercooler Testing Group 1
FT-1438 Dynamometer Testing Aftercooler 1 Visual Inspection
Inspect the following components of the air-to-air aftercooler system:
All lines
All hoses
All gasket jointsMake sure that the constant torque hose clamps are tightened to the correct torque. Check the truck manufacturer's specifications for the correct torque. Check the welded joints for any cracks. Check the brackets for correct positioning. Also, make sure that these brackets are in good condition. Use compressed air to clean any debris or any dust from the aftercooler core assembly. Inspect the aftercooler core assembly's fins for the following conditions:
Damage
Debris
Salt corrosionUse a stainless steel brush to remove any corrosion. Make sure that you use soap and water.
Pressurized air can cause personal injury. When pressurized air is used for cleaning, wear a protective face shield, protective clothing, and protective shoes.
Note: When air-to-air aftercooler parts are repaired and air-to-air aftercooler parts are replaced, a leak test should be completed. Do not use winter fronts and shutters with aftercooler systems. Winter fronts can only be used on certain truck models. The jacket water pumps on these models will overheat before the ai