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TM 10-3930-671-24
4.
Clean the injector bore and crank the engine to
blowout any loose carbon particles.
5.
Install high-range compression gauge with the
appropriate adapters, as necessary. A new seat
washer should be used.
Injector Thread: M24 x 2
6.
Connect the compression test gauge.
7.
Crank the engine for 5 compression strokes or
until the reading stops increasing.
8.
Observe
and
record
the
readings
for
all
cylinders.
Analysis of Diesel Compression Pressure Readings
1.
All cylinders should read between 325 - 400 psi
@ 150 rpm.
1)
A low, even compression in two adjacent
cylinders indicates a cylinder head gasket
leak.
2)
A reading of 20 psi above the other
cylinders indicates high carbon deposits
on the piston and cylinder head.
3)
A reading of more than 20 psi below the
other cylinders indicates leakage at the
cylinder head gasket, valves, or piston
rings.
2.
To determine if the rings or valves are at fault,
perform a static leak-down test. Follow the
instructions that are provided in your leak-down
test equipment.
Test Completion
1.
Install the injectors.
NOTE
When installing injectors in the engine cylinder head, it is
essential that a new, correct type heat-shield washer be
fitted between the nozzle cap and the cylinder head.
2.
Tighten injectors evenly to torque specification:
52 Ib-ft (70 N•m).
F-84
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