Repair - Yanmar BY Series Service Manual

ENGINE

REPAIR

If the engine is to be completely disassembled,
perform the following preliminary steps:
1. Disconnect battery cables at the battery. Always
disconnect negative (-) battery cable first.
2. Close all valves in fuel supply line.
3. Remove electrical connections, intake and
exhaust system connections, and fuel supply
lines from engine. Cap or plug all open fuel
connections.
4. Drain engine coolant from cylinder block.
A
DANGER
CRUSH HAZARD!
• NEVER stand under hoisted engine. If
the hoist mechanism fails, the engine
will fall on you, causing death or
serious injury.
• Failure to comply will result in death or
serious injury.
5. Remove engine from boat. Mount engine to a
suitable engine repair stand having adequate
weight capacity.
6. Cap or plug all openings to prevent
contamination.
7. Remove starter motor and alternator.
8. Clean engine by washing with solvent, air or
steam cleaning. Carefully operate cleaning
equipment so as to prevent any foreign matter
or fluids from entering engine or any fuel
system or electrical components remaining on
the engine.
9. Remove cooling system components from
engine.
5-18
10. Drain engine oil into a suitable container.
Remove oil filter.
0000033enMarine
BY Service Manual
Repair