FITTING AS-ADJ 4441895 - Caterpillar

Specifications
Table 1
Specifications for Compression
Pressure in the Cylinder 2450 to 2950 kPa (355.3480 to 427.8680 psi) at 250 rpm Introduction
The cylinder compression test should only be used in order to compare the cylinders of an engine. The pressure in the cylinder should be between 2450 to 2950 kPa (355.3480 to 427.8680 psi) at 250 rpm. 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 in order 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 set correctly.
All fuel injection nozzles are removed.
The fuel supply is disconnected.Required Tools
Table 2
Qty Part Number Part Name
1 9U-6274 Compression Test Tool Gp
1 460-4917
or
268-1971(1) Adapter
(1) This adapter is used for the C4.4 engine.Test Procedure
Install a gauge for measuring the cylinder compression in the hole for a fuel injection nozzle.
Operate the starting motor in order to turn the engine. Record the maximum pressure which is indicated on the compression gauge.
Repeat Steps 1 and 2 for all cylinders.