DF9.9T/TH/DF15 (Serial No. 110001 and later) 21
PERIODIC MAINTENANCE
MAINTENANCE AND TUNE-UP PROCEDURES
SPARK PLUG
Standard spark plug: NGK CPR6EA-9
CARBON DEPOSIT
Inspect for a carbon deposit on spark plug base.
If carbon is present, remove it with a spark plug cleaning
machine or by carefully using a pointed tool.
SPARK PLUG GAP
Measure spark plug gap with a thickness gauge.
Adjust to within specified range if gap is out of specification.
Spark plug gap: 0.8 – 0.9 mm (0.031 – 0.035 in)
09900-20803: Thickness gauge
CONDITION OF ELECTRODE/INSULATOR
Check the electrode and insulator condition.
If the electrode is extremely worn or burnt, replace the spark
plug.
If the spark plug has a broken insulator, damaged threads, etc.,
replace the spark plug.
Spark plug: 11 N·m (1.1 kg-m, 8.0 lb-ft)
• Inspect every 100 hours (6 months).
• Replace every 200 hours (12 months).
Only resistor (R) type spark plugs must be used with
this engine. Using a non-resistor spark plug will cause
ignition system malfunctions.
Confirm the thread size and reach when replacing the
plug. If the reach is too short, carbon will be deposited
on the threaded portion of the plug hole resulting in
possible engine damage.
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