HINGE ASSEM. 5K1239 - Caterpillar

Table 1
Tools Needed    
Part Number     Part Name     Qty    
9U-6274     Compression Test Tool Gp     1    The following conditions can affect the results of the cylinder compression test:
Battery
Condition of the starting motor
Ambient conditions
Quality of the compression gauge
Illustration 1 g01367082
Checking compression of engine
Disconnect the main harness from the relay connector.
Disconnect the solenoid for the high pressure pump from the sensor on the solenoid for the high pressure pump.
Select a cylinder. Remove the injector in the cylinder.
Install a adapter for the gauge in the location of the injector. Install a compression gauge to the adapter for the gauge.
Use the starter to start the engine. Run the engine at the specified speed. Read the gauge.
If the measured value is at the limit or below the limit, overhaul the engine.
Table 2
    Standard at Assembly     Repair Limit    
Compression Pressure (1)     2940 kPa (427 psi)    
2650 kPa (384 psi)    
( 1 ) The compression pressure is taken at 200 rpm.
Be sure to measure the compression on all of the cylinders. If all of the cylinders are not checked an improper diagnosis may result. The compression pressure will vary with the change in engine rpm. It is necessary to keep the engine rpm constant for all cylinders when you are taking a compression reading.