McCulloch M48 Owner's Manual page 18

Do not over-tighten the spark plug as engine damage may occur.
DECK CLEANING
Wipe deck with a damp cloth.
UNDER DECK CLEANING
1. Hose under deck by tilting the mower backwards so that the spark plug is up. Allow mower
to dry before storing.
Do not hose engine. Water can damage engine or contaminate the fuel system.
CAUTION
CAUTION
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