CAP 5I7630 - Caterpillar

ENGINES
3500 FAMILY OF DIESEL ENGINESProblem:
Engine reliability and durability have a direct relationship with the application of ratings and the implementation of proper maintenance practices. When ratings are not used in the correct application or maintenance practices are poor, performance parameters can be exceeded.Performance parameters and rating criteria are established for optimum operation and should be adhered to for acceptable reliability.Solution:
Use the following information to monitor performance parameters to prevent engine valve failures and improve engine reliability and service life.Rating Background
Caterpillar engine ratings provide an opportunity to be competitive in today's world. Ratings are the technical response to meeting customer needs. Ratings must be applied properly to benefit the customer, dealer, and Caterpillar. The consequence of rating applications that are not correct or improper maintenance can be costly.Certain criteria are evaluated as ratings are developed . Such criteria as structural integrity, thermal stresses, mechanical aspects, life-to-overhaul, environmental aspects, and generator concerns. The development of a rating is a trade-off of these criteria. Technology has made major advancements, yet some questions still require decisions based on judgment and experience.Ratings are developed and evaluated using the following parameters: exhaust temperatures, cylinder pressures, fuel injection pressure, turbo speed, smoke & emissions, and piston temperatures. These parameters will dictate the limit of the engine rating. It is recommended that close attention be paid to commercial customer rating requirements to improve customer satisfaction, avoid exceeding rating parameters, and increase engine reliability.Careful consideration should be given to the customer's "worst case" scenario. Installation and components should be selected based on worst case situations. All elements of the rating description should be evaluated.EPG: Priority should be given to "typical load factor" as specified in the rating guidelines. In most cases ratings should be based on a chronological daily load curve or duration of load curve.Marine: Priority should be given to maximum time at full throttle combined with total operating time per year. It is understood that many applications are not clearly defined and that extreme requirements may not be economically feasible. However, shortcomings in the rating selection, installation, operation, and maintenance generate significant expense to the customer, dealership, and Caterpillar due to loss of productivity, rework to correct problems, and operation and maintenance costs.Monitoring Parameters To Improve Engine Reliability And Durability
Caterpillar establishes performance curves and engine information that is based on a bare engine at standard conditions. Technical Marketing Information (TMI) data is based on a bare engine without inlet air restriction, exhaust restriction, altitude compensation (500 ft). Data is corrected to SAE J1349 standard conditions of 100 kPa (29.61 in Hg) and 25 C (77 F). Ratings and TMI data also meet DIN 6271 standard conditions of 100 kPa (29.61 in Hg), and 27 C (81 F), and 60 % relative humidity.TMI data should be used as a guide since customer installations DO NOT generally operate under these same conditions. The best data for future reference is the performance data gathered at commissioning.Critical parameter guidelines and limits are outlined below to monitor parameters