Isuzu A-4BG1 Workshop Manual page 41

I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I II II I I I I I II II II II II I I I I I I I I I
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
I
Limit
I
I
31 .o (441)
I
26.0 (370)
I
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.