Isuzu A-6BG1 - Compression Pressure Measurement

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MAINTENANCE 2-15
Compression
gauge adaptor
.
m
:
1. Operate the engine to warm-up until the coolant
temperature reaches to 75OC (167°F).
2. Remove all of the glow plugs and the injection
pipes.
3. Attach a compression gauge to the No. 1 cylinder
glow plug installation threads.
Note:
Compression pressure may be measured starting at any
cylinder and in no particular cylinder order. However, it
is very important that the compression pressure be mea-
sured in each cylinder.
Therefore, start at the No.1 cylinder and work back. In
this way, you will be sure to measure the compression
pressure in each cylinder.
Compression Gauge:
Compression Gauge Adapter: 5-85317-003-O (JKM-1015)
4. Crank the engine with the starter motor and take the
compression gauge reading. _
kg/cm* (psi) at 200 rpm at sea level
Standard
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Limit
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31 .o (441)
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26.0 (370)
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5. Repeat the procedure (Steps 2 and 3) for the remain-
ing cylinders.
Compression pressure should be approximately the
same for each cylinder.
A variation exceeding 2.0
kg/cm* (28 psi) is unacceptable.
If the measured value exceeds the specified limit,
the related parts must be checked.