830044 15 Mercury ECU, Engine Control Unit (CDI)

Table 1
Maintenance Interval Schedule
Fuel Consumption for C32 ACERT Commercial Diesel Engines(1)
Interval Rating
A B C D
250 Service Hours 25,000 L (6,600 US gal) 33,000 L (8,800 US gal) 40,000 L (10,500 US gal) 50,000 L (13,200 US gal)
500 Service Hours 50,000 L (13,200 US gal) 66,000 L (17,600 US gal) 80,000 L (21,000 US gal) 100,000 L (26,400 US gal)
1,000 Service Hours 100,000 L (26,400 US gal) 132,000 L (35,200 US gal) 160,000 L (42,000 US gal) 200,000 L (52,800 US gal)
2,000 Service Hours 200,000 L (52,800 US gal) 264,000 L (70,400 US gal) 320,000 L (84,000 US gal) 400,000 L (105,600 US gal)
3,000 Service Hours 300,000 L (79,200 US gal) 396,000 L (105,600 US gal) 480,000 L (126,000 US gal) 600,000 L (158,400 US gal)
(1) Fuel consumption is based on a load factor of approximately 60 percent.Maintenance intervals must be reduced for engines that operate in a severe service application and for engines that operate in a different engine rating definition.Severe Service Application
Severe service operation can accelerate component wear. An engine which operates in a severe service application may need more frequent maintenance intervals for the following reasons:
Maximum reliability
Retention of full service lifeA severe service application is an application which exceeds the current published standards for that engine. Caterpillar maintains standards for the following engine parameters:
Horsepower
Range of rpm
Fuel consumption
Fuel quality
Altitude
Maintenance intervals
Selection of oil
Selection of coolant
Environmental qualities
InstallationRefer to the standards for your engine or consult your Caterpillar dealer to determine if your engine is operating within the defined parameters.Because of individual applications, identification all the factors which can contribute to severe operation is not possible. Consult your Caterpillar dealer about the maintenance that is needed for your specific engine.The following factors can contribute to severe operation: environment, improper operating procedures, and improper maintenance practices.Extreme Ambient Temperatures
Extended operation in environments known for extreme cold or hot can damage components. Valve components can be damaged by carbon buildup if the engine is frequently started and stopped environments known for extreme cold temperatures. Extremely hot inlet air reduces the performance capabilities of the engine.Note: See this Operation and Maintenance Manual, "Cold-Weather Operation" topic (Operation Section), or see Supplement, SEBU5898, "Cold-Weather Recommendations".Cleanliness
Unless the equipment is cleaned regularly, extended operation in a dirty environment and in a dusty environment can damage components. Built up mud, dirt, and dust can encase components. The aforementioned elements can make maintenance difficult. The buildup can contain corrosive chemicals. Corrosive chemicals and salt can damage some components.Improper Operating Procedures
Extended operation at low idle
Minimum cool down periods after high load factor operation
Operating the engine beyond the guidelines for the engine rating
Operating the engine at loads that are greater than the rated load
Operating the engine at speeds that are greater than the rated speed
Use of the engine for an application that is not approvedImproper Maintenance Practices
Extension of maintenance intervals
Not using recommended fuel, lubricants, and coolantOverhaul Considerations
Some factors that are important for determining the overhaul intervals include the following considerations:
Performance of preventive maintenance
Use of recommended lubricants
Use of recommended coolants
Use of recommended fuels
Proper installation
Operating conditions
Operation within acceptable limits
Engine load
Engine speed
Use of S O S Services Fluids AnalysesGenerally, engines that are operated at a reduced load and/or speed achieve more service life before an overhaul. Achieving more service life prior to an overhaul is for engines that are properly operated and maintained.Other factors must also be considered for determining a major overhaul:
The total amount of fuel consumption
The service hours of the engine
An increase of oil consumption
An increase of crankcase blowby
The wear metal analysis of the lube oil
An increase in the levels of noise and vibrationAn increase of wear metals in the lube oil indicates that the bearings and the surfaces that wear may need to be serviced. An increase in the levels of noise and vibration indicates that rotating parts require service.Note: It is possible for oil analysis to indicate a decrease of wear metals in the lube oil. The cylinder liners may be worn so that polishing of the bore occurs. Also, the increased use of lube oil will dilute the wear metals.Monitor the engine as the engine accumulates service hours. Consult your Caterpillar dealer about scheduling a major overhaul.Note: The driven equipment may also require service when the engine is overhauled. Refer to the literature that is provided by the OEM of the driven equipment.Overhaul Intervals Which are Based on Fuel Consumption
Experience has shown that the interval for an overhaul is most accurately based on fuel consumption. Fuel consumption corresponds more accurately to the engine load.
Table 2
Overhaul Intervals(1)
Interval Fuel Consumption Service Hours
Top End 1000000 L (264000 US gal) 10000
Major 2000000 L (528000 US gal) 20000
(1) Use the interval that occurs first.