LIGHTING GP 3925052 - Caterpillar

Table 1
Required Tools
Tool Part Number Part Description Qty
A 9U-6274 Compression Test Tool Gp 1
B 268-1971 Adaptor 1 The cylinder compression test should only be used to compare the cylinders of an engine. If one or more cylinders vary by more than 350 kPa (51 psi), the cylinder and related components may need to be repaired.A compression test should not be the only method which is used to determine the condition of an engine. Other tests should also be conducted to determine if the adjustment or the replacement of components is required.Before the performance of the compression test, make sure that the following conditions exist:
The battery is in good condition.
The battery is fully charged.
The starting motor operates correctly.
The valve lash is correct.
All glow plugs are removed.
The ECM is powered.
The fuel pressure sensor is connected.
The suction control valve is connected.
Remove the fuse for the glow plugs.
Illustration 1 g01343864
Typical example
Remove all glow plugs (1). Refer to Disassembly and Assembly, "Glow Plugs - Remove and Install" for the correct procedure.
Install Tooling (A) and Tooling (B) for measuring the cylinder compression in glow plug port (2).
If possible, use the electronic service tool to disable fuel injection.
Operate the starting motor to turn the engine. Record the maximum pressure which is indicated on the compression gauge.
Repeat steps 3 and 5 for all cylinders.
Install all glow plugs (1). Refer to Disassembly and Assembly, "Glow Plugs - Remove and Install" for the correct procedure.
Install the fuse for the glow plugs.
If necessary, use the electronic service tool to enable fuel injection.