3887148 Volvo.Penta Breather pipe

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 is free to react with the NOX and the oxygen present in the exhaust system stream. This reaction occurs on the SCR catalyst. NH3 and NOX are converted into gas particles of nitrogen and water. The inlet and outlet NOX sensors read the levels of NOX and determine how much DEF needs to be injected into the exhaust.Dosing Cabinet
The dosing control cabinet controls the following:
Rate of DEF flow to the injector
Compressed air pressure
Urea purge shutdown cycleThe aftertreatment ECM located in the dosing cabinet and the Cat ECM is designed to communicate with each other. This communication controls the complete engine/emission system to meet emission levels.Selective Catalytic Reduction Substrate
The Selective Catalyst Reduction (SCR) substrates are located in the reactor housing. These catalysts allow exhaust to flow through the substrate converting the NOx into N2 and H20.The exact chemical formulation of the catalyst has been engineered for this engine to provide optimal system performance and durability.