3512燃油消耗及大修周期(英文)

Overhaul Intervals

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

Generally, engines that are operated at a reduced load and/or speed achieve more service life before an overhaul. However, this 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 vibration

An 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.

Using Fuel Consumption For Calculating the Overhaul Intervals

Experience has shown that maintenance intervals are most accurately based on fuel consumption. Fuel consumption corresponds more accurately to the engine load. Tables 1, 2, and 3 list average ranges of fuel consumption and service hours for standard displacement engines. Tables 4 and 5 list average ranges of fuel consumption and service hours for high displacement engines. These tables are based on a load factor of approximately 60 percent.

Standard Displacement Engines

( 1 ) Fuel consumption is based on a load factor of approximately 60 percent.

( 1 ) Fuel consumption is based on a load factor of approximately 60 percent.

( 1 ) Fuel consumption is based on a load factor of approximately 60 percent.

High Displacement E ngines

( 1 ) Fuel consumption is based on a load factor of approximately 60 percent.