This document is printed from SPI². Not for RESALE
3. The electronic service tool will display “Ash
Service Calibration Successful” when the
calibration has been completed.
i04461759
Compression - Test
The cylinder compression test should only be used in
order 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 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 correct.
• All glow plugs are removed.
• The ECM is powered.
• The fuel pressure sensor is connected.
• The suction control valve is connected.
Illustration 56 g02647199
Typical example
1. Remove the glow plug (1). Refer to Disassembly
and Assembly, “Glow Plugs - Remove and Install”
for the correct procedure.
2. Install a suitable gauge for measuring the cylinder
compression in the hole for the glow plug (2).
3. Remove the fuse for the glow plugs.
4. Operate the starting motor in order to turn the
engine. Record the maximum pressure which is
indicated on the compression gauge.
5. Repeat steps 2 and 4 for all cylinders.
6. Install the fuse for the glow plugs.
i04823055
Engine Valve Lash - Inspect
Table 7
Required Tools
Tool Part Number
Part Description
Qty
A
(1)
27610291
Barring Device Housing
1
27610289 Gear 1
(1)
This Tool is used in the aperture for the electric starting motor.
Illustration 57 g01353215
Cylinder and valve location
(A) Inlet valve
(B) Exhaust valve
Too much valve lash can cause some broken valve
stems, springs, and spring retainers. Damage to the
valve mechanism will produce emissions in excess of
the correct specification.
The hydraulic lifter will compensate for all normal
wear of the components of the valve train.
Too much valve lash can be an indication of the
following problems:
64 UENR0623
Air Inlet and Exhaust System
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