BEARING-CAMSHAFT 8N2648 - Caterpillar

Proper operation and maintenance are key factors in attaining the maximum service life and economy for the engine. Follow the instructions in this Operation and Maintenance Manual to minimize operating costs and maximize the service life of the engine.Observe the gauges frequently during engine operation. Record the data from the gauges in a log regularly. Compare the data to the specifications for normal engine operation. Comparing the data over time will help to detect changes in engine performance.Investigate any significant change in the gauge readings. Monitor the engine operation so that problems may be quickly corrected.Operating the Engine and the Driven Equipment
Check the gauges and the driven equipment frequently during engine operation under a load. At certain ratings, 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: Understand the partial load operation capabilities of your engine system and follow the recommendations in this section. By following the recommendations, you can avoid the need to follow the hydrocarbons release procedure or possible engine system damage.SCR Performance and Hydrocarbons (HC)
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 and, upon 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.
Table 1
Application Maximum Duration Minimum Sea Water Temp
Propulsion 12 hours at 10% Load 10° C (50° F)
Auxiliary 24 hours at 15 % Load 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