Timing Belt Inspection - Mercury 40 FourStroke Tiller Handle Operation Maintenance Warranty Installation Manual

2. Remove the spark plugs to inspect. Replace spark plug if electrode is
worn or the insulator is rough, cracked, broken, blistered, or fouled.
3. Set the spark plug gap to specification.
Spark Plug
Spark plug gap
4. Before installing spark plugs, remove any dirt on the spark plug seats.
Install plugs finger‑tight, and then tighten 1/4 turn or tighten to the
specified torque.
Description
Spark plug

Timing Belt Inspection

Inspect the timing belt and have it replaced by an authorized dealer if any of the
following conditions are found.
• Cracks in the back of the belt or in the base of the belt teeth.
• Excessive wear at the roots of the cogs.
• Rubber portion swollen by oil.
• Belt surfaces roughened.
eng
MAINTENANCE
69
26946
26947
0.9 mm (0.035 in.)
Nm lb‑in.
27 –
lb‑ft
20