3-18
INSP
ADJ
E
GENERAL
4. Tighten:
● Spark plugs
NOTE:
● Before installing the spark plug, clean the
gasket surface and spark plug surface.
Also, it is suggested to apply a thin film of
anti-seize compound to the spark plug
threads to prevent thread seizure.
● If a torque wrench is not available, a good
estimate of the correct tightening torque
for new spark plug(-s) is to finger tighten
a the spark plug and then tighten it
another 1/4 to 1/2 of a turn b.
T
R
.
.
Spark plug:
25 Nm (2.5 m • kg, 18 ft • lb)
Compression pressure measurement
CAUTION:
Before removing a spark plug, use com-
pressed air to blow away dirt accumulated
in the spark plug well to prevent it from
falling into the cylinder that is being tested.
1. Check:
● Valve clearance
Out of specification → Adjust.
Refer to “Valve clearance adjust-
ment”.
2. Warm-up:
● Engine
3. Remove:
● Spark plug(-s)
4. Install:
● Compression gauge 1
(into the spark plug hole)
NOTE:
Use a compression gauge that is used for
automobiles.
1
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