36310-ZV7-781 SOLENOID ASSY., REMOTE CHOKE (Honda Code 4433181). Honda
BF25A1 LRSA, BF25A1 SRSA, BF25A1 XRSA, BF25A2 LHA, BF25A2 LHSA, BF25A2 LRSA, BF25A2 SHA, BF25A2 SHSA, BF25A2 SRSA, BF25A2 XRSA, BF25A3 LRSA, BF25A3 SRSA, BF25A3 XRSA, BF25AW LRSA, BF25AW SRSA, BF25AW XRSA, BF25AX LRSA, BF25AX SRSA, BF25AX XRSA, BF25A
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Compatible models:
BF25A1 LRSA
BF25A1 SRSA
BF25A1 XRSA
BF25A2 LHA
BF25A2 LHSA
BF25A2 LRSA
BF25A2 SHA
BF25A2 SHSA
BF25A2 SRSA
BF25A2 XRSA
BF25A3 LRSA
BF25A3 SRSA
BF25A3 XRSA
BF25AW LRSA
BF25AW SRSA
BF25AW XRSA
BF25AX LRSA
BF25AX SRSA
BF25AX XRSA
BF25AY LRSA
BF25AY SRSA
BF25AY XRSA
BF30A1 LRSA
BF30A1 SRSA
BF30A2 LHA
BF30A2 LHSA
BF30A2 LRSA
BF30A2 SHA
BF30A2 SRSA
BF30A3 LRSA
BF30A3 SRSA
BF30AW LRSA
BF30AW SRSA
BF30AX LRSA
BF30AX SRSA
BF30AY LRSA
BF30AY SRSA
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Information:
Table 1
3516C Engine Specifications    
Item     Specification    
Rated speed (rpm)     1800 RPM    
Cylinders and arrangement     60 degree Vee 16    
Bore    
170 mm (6.7 inch)    
Stroke    
215 mm (8.5 inch)    
Type     4-stroke cycle    
Compression ratio (1)     14.7:1    
Compression ratio (2)     n/a    
Aspiration     Turbocharged    
Method of cooling the turbocharged air     Separate circuit aftercooling    
Displacement per cylinder    
4.9 L (297.2 in3)    
Total displacement    
78 L (4760 in3)    
Rotation (flywheel end)     Counterclockwise rotation    
Fuel     See this Operation and Maintenance Manual, "Fluid Recommendations".    
Method of fuel injection     Electronic fuel injectors    
Method of starting     Electric starting motor or air starting motor    
Exhaust back pressure (customer piping)    
6.7 kPa (26.92 inch of H2O)    
Total back pressure    
18.65 kPa (75 inch of H2O)    
Maximum inlet air restriction    
2.5 kPa (10 inch of H2O)    
( 1 ) Except for serial numbers beginning with T3W
( 2 ) Serial numbers beginning with T3W
Illustration 1 g00308357
3516C Engine (A) Inlet valves (B) Exhaust valves (C) FlywheelAftertreatment system description
Illustration 2 g03684316
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 comprised of the following components:
Air compressor (OEM supplied)
DEF Dosing cabinet
DEF Injector
DEF Mixing tube
DEF Supply tank (OEM supplied)
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 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.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 pressureThe aftertreatment ECM located in the dosing cabinet and the Cat ECM are designed to communicate with each other. This communication controls the complete engine/emission system in order to meet emission levels.DEF Tank
There are two separate DEF tanks in the dosing system.
DEF tank 1 is the customer installed DEF tank. DEF tank 1 is the bulk DEF tank. A DEF high and low-level switch in tank 1 will notify the operator when the tank requires refilling.
DEF tank 2 is the buffer tank located in the dosing cabinet. Tank 2 is a small DEF tank that is filled from DEF tank 1. Tank 2 provides DEF to the DEF pump to be injected into the exhaust.Reactor Housing
The reactor housing contains the following:
SCR catalyst substrates
DEF injector
DEF mixing tube
SCR catalyst temperature and pressure sensors
NOx sensorsThe aftertreatment ECM uses the sensors on the module to determine how much DEF needs to be injected into the exhaust system.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 while converting the NOx into N2 and H20.