41151-94500 Suzuki Cap

Operating the Engine and the Driven Equipment
Check the gauges and the driven equipment frequently while the engine is operating under a load. The engine can be operated for extended periods of time at full load.Partial Load Operation
Extended operation at reduced load (less than 30%) may cause increased oil consumption and carbon buildup in the cylinders. Extended operation at reduced load may also cause fuel to slobber through the exhaust system. This fuel slobber and oil consumption can result in either loss of power, poor performance, or aftertreatment system damage.To maintain engine efficiency and performance, apply a full load each hour or operate the engine at a load that is greater than 30%. These actions will burn excess carbon from the cylinders. Operating the engine at 30% or higher will also keep the aftertreatment system in normal operating condition.Note: Do not idle the engine for longer than 12 hours without loading the engine and maintaining a 30% or higher load on engine.SCR Performance and Hydrocarbons
Diesel engine combustion produces hydrocarbons (HC) in the exhaust gas emissions. Engine HC emissions are part of normal engine operation, and the levels are further reduced with the use of the SCR aftertreatment system. Certain operating conditions (typically, less than 200° C (392° F) SCR Inlet Temperature) such as continuous idle at low engine speeds and/or loads, can cause temporary reduced catalyst performance. After operating at continuous idle at low engine speeds and/or loads, an immediate return to higher loads, may result in catalyst damage due to rapid increase in exhaust gas temperature.Your power system is equipped with a strategy to protect the aftertreatment by regulating or limiting the available power to avoid such an event. Caterpillar has designed the Marine Engine and Aftertreatment system to operate safely without risk to the catalyst for 12 hours of low idle and/or continuous low load operation.While managing SCR Inlet temperature and applying load, your engine system safely removes accumulated HC while gradually allowing the system to return to full available power.The engine system protection strategy is always active during operation. In an emergency this protection can be overridden using the engine protection override feature. Throughout operation, the engine system may experience the following codes:SPN 2434-1 Engine Exhaust Manifold #1 Temperature #1: Low - Most Severe (3)
When SPN 2434-1 is active, this code requires the operator to follow the HC Release Procedure.Level 3 - The Level 3 Code indicates that the vessel operator must follow an HC Release Procedure to remove the high HC accumulated on the catalyst and protect the catalyst from damage while allowing the vessel to return to operation without derate. In an emergency the engine protection override feature can be activated to allow full engine power however catalyst damage could occur.SPN 2434-18 Engine Exhaust Manifold #1 Temperature #1: Low - Moderate Severity (2)
Continued idling or low load operation (typically 20% load or less) may result in reduced power capability if SPN 2434-18 is active.Level 2 - The Level 2 Code is annunciated to provide the vessel operator or technician a warning to change operation to prevent high HC accumulation, avoid possible derate in power if the low load condition continues, and reduce the potential of catalyst damage. Engine HC Release Procedure must be ran to avoid Level 3 Alarm and derate that reduces available engine power to 50%.SPN 1237-31 Display indication that the customer has overriden the derate using the engine protection override feature.
Thermal Management/Mitigation
HC Release Procedure
If your Cat Marine Engine and Aftertreatment System are in a Level 2 or Level 3 situation, then the vessel operator or engineer will need to find an opportunity to increase engine load to target a higher exhaust temperature. For variable speed propulsion applications, targeting a higher exhaust temperature can be accomplished by temporarily increasing engine speed thus load on the engine. The HC Release Procedure below will allow the engine to raise engine exhaust temperature and remove the accumulated HC from the catalyst system.For the HC Release Procedure, operating schedules are listed below for various Marine Propulsion and Auxiliary applications to remove hydrocarbon sufficiently from the catalyst and return to work.Note: Times of HC Release Procedure may vary due to differing ambient conditions and vessel design.To perform the HC Release Procedure to remove HC from the catalyst effectively and efficiently, follow the guidelines listed in the table below.
Table 1
C280 Marine Engine
Speed (RPM) SCR Inlet Temperature Time (Min)
900 300° C (572° F) 15
900 350° C (662° F) 40 The procedure should take no more than 1 hour to complete, and may vary based on the engine rating, ambient conditions, and HC loading percentage. For the operator to perform the procedure, engine speed and SCR inlet temperature are to be displayed.Perform the following procedure:
Before increasing speed or load, ensure that all requested parameters are visible.
For propulsion or DEP engines, position the vessel in a manner that the engines can be safely loaded.
Find the appropriate HC Release Procedure for your Marine Engine System. Raise the engine speed or load to the first step of the procedure with the corresponding load required to reach the SCR Inlet Temperature. Use the engine speed or load references for this step to maintain the SCR Inlet Temperature listed in the procedure continuously for the time prescribed.Note: The SCR Inlet Temperature may go over the targeted SCR Inlet Temperature. Adjust the engine speed or load to keep the SCR Inlet Temperature no more than 15° C (59° F) greater than the SCR Inlet Temperature target