CRANKSHAFT AS 1220721 - Caterpillar

The 3500E Marine Engine is an electronically controlled diesel engine. The engine has an electronic unit injector. The engine can be equipped with either separate circuit aftercooling or jacket water aftercooling.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
3500E Engine Specifications
Item 3516E 3512E
Rated speed (rpm) 1800 RPM 1800 RPM
Cylinders and arrangement 60 degree Vee 16 60 degree Vee 12
Bore 170 mm (6.7 inch) 170 mm (6.7 inch)
Stroke 215 mm (8.5 inch) 215 mm (8.5 inch)
Type 4-stroke cycle 4-stroke cycle
Compression ratio 14.3:1 14.3:1
Aspiration Turbocharged Turbocharged
Method of cooling the turbocharged air Separate circuit aftercooling Separate circuit aftercooling
Displacement per cylinder 4.9 L (299 cubic inch) 4.9 L (299 cubic inch)
Total displacement 78 L (4760 cubic inch) 58.8 L (3588 cubic inch)
Rotation (flywheel end) Counterclockwise rotation Counterclockwise rotation
Method of fuel injection Electronic fuel injectors Electronic fuel injectors
Method of starting Electric starting motor or air starting motor Electric starting motor or air starting motor
Exhaust back pressure (customer piping) 6.7 kPa (26.92 inch of H2O) 6.7 kPa (26.92 inch of H2O)
Total back pressure 18.65 kPa (75 inch of H2O) 18.65 kPa (75 inch of H2O)
Maximum inlet air restriction 2.5 kPa (10 inch of H2O) 2.5 kPa (10 inch of H2O)
Illustration 1 g00308167
3512E Marine Engine
(A) Inlet valve
(B) Exhaust valve
(C) Flywheel
Illustration 2 g00308357
3516E Marine Engine
(A) Inlet valves
(B) Exhaust valves
(C) FlywheelAftertreatment system description
Illustration 3 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