PLUNGER ASSEM. 6P9003 - Caterpillar

3516C Petroleum Engine is an electronically controlled diesel engines. The engine has electronic unit injectors. The engine is equipped with separate circuit aftercooling (SCAC).Engine efficiency and engine performance depend on adherence to proper operation and maintenance recommendations. Use the recommended fuels, lubrication oils, and coolant. Pay special attention to the air cleaner, to the fuel system, to the lubrication system, and to the cooling system maintenance. Refer to the Operation and Maintenance Manual, "Maintenance Interval Schedule" for more information on maintenance items.
Table 1
3516C Engine Specifications
Item Specifications
Rated Speed (rpm) 1200
Idle Speed (rpm) 600 to 1250
Cylinders and arrangement 60 degree V-8
Bore 170 mm (6.7 inch)
Stroke 215 mm (8.4 inch)
Type 4-stroke cycle
Compression ratio 14.7:1
Aspiration Turbocharged
Method of cooling the turbocharged air SCAC
Displacement per cylinder 4.8 L (298 in3)
Total displacement 76.8 L (4687 in 3)
Rotation (flywheel end) Counterclockwise rotation is standard.
Fuel See this Operation and Maintenance Manual, "Refill Capacities and Recommendations" (Maintenance Section).
Method of fuel injection Electronic unit injectors
Method of starting Air starting motor
Designed back pressure in the exhaust system 2.5 kPa (10 inches of H2O)
Maximum allowable back pressure 6.7 kPa (27 inches of H2O)
Maximum allowable back pressure (1) If the exhaust back pressure exceeds 15 kPa (60 inches of H2O), refer to the supplement data in SIS web TMI. Enter performance data EM0875 for additional information on the effects of increased back pressure.
Maximum inlet air Restriction 6.2 kPa (25 inches of H2O)
Air cleaners Single element
(1) Engine serial number PES1-Up
Illustration 1 g00308357
3516C Engine
(A) Inlet valves
(B) Exhaust valves
(C) FlywheelAftertreatment system description
Illustration 2 g06031628
Caterpillar supplied aftertreatment components are illustrated with dashed line rectangles.
Selective Catalyst Reduction (SCR) catalyst technology is used to reduce NOx emissions and particulate matter.The aftertreatment system is composed of the following components:
Air compressor
Bulk Urea Transfer Pump
DEF Dosing cabinet
DEF Filter
DEF Mixing tube
DEF Nozzle
DEF Supply tank
SCR catalysts
SCR reactor housingEngine exhaust flows into the SCR System reactor housing through the exhaust inlet. Once sufficient temperature is achieved, the DEF is injected into the exhaust. Exhaust flows through a mixer assembly in the mixing tube to ensure that exhaust is not stratified for uniformity. This mixing will ensure complete disbursement across SCR catalyst section. Precise DEF injection is monitored and controlled by an electronic controller in the dosing cabinet. The following components provide signals to the controller to control DEF injection for emission reduction:
Thermocouple located in the reactor housing.
Inlet NOx sensor located in the exhaust before the inlet to the SCR catalyst reactor housing.
Outlet NOx sensor located in the exhaust at the outlet of the SCR catalyst reactor housing.When engine operating conditions dictate, DEF fluid is injected into the exhaust stream before entering the SCR. When injected into the exhaust stream, the DEF is atomized into droplets. The atomized droplets are then sent through the mixer. The mixer disrupts the exhaust flow and allows DEF to be distributed throughout the exhaust gas. Water evaporates due to the high temperature of the exhaust. This process will cause the DEF to decompose and release ammonia (NH3) that was bound to the DEF. NH3