Yanmar 6LPA-STP2 Service Manual page 312

TROUBLESHOOTING
Symptom
Failure of governor
Other
Engine stops suddenly:
No fuel feed
Faulty operation of governor
Actuated emergency stop
system (NOTE: this section is
not related to the engine)
Other
12-6
Probable Cause
Damaged governor bearing
Faulty operation of governor link
Sticking governor sleeve
Fuel control sleeve failure
Overload operation
Moving parts seized
Slippage of clutch
Fuel level in fuel tank is low
Air trapped in fuel system or fuel injection
Water trapped in fuel tank
Fuel cock closed
Clogged fuel filter
Broken fuel pipe
Failure of fuel feed pump
Broken governor spring
Sticking governor sleeve
Loose lubrication oil pressure adjusting valve
Clogged lubrication oil filter
Leak from safety valve of lubrication oil pump
Failure of lubrication oil pump
Actuated low lubricant pressure relay
Actuated over speed relay
Actuated water shut-off relay
Moving parts seized
Overheating caused by insufficient seawater
© 2007 Yanmar Marine International
Troubleshooting Chart
Measure
Replace
Repair
Clean
Disassemble, clean and
service
Reduce load
Disassemble, inspect and
conduct servicing
Inspect and repair
Add fuel and prime
Bleed air
Drain water from drain cock
and fuel pipe, conduct priming
Inspect and repair as
necessary
Replace
Replace
Replace
Replace
Inspect and repair
Tighten valve
Clean
Tighten safety valve
Disassemble and repair, or
replace
Return to the original
operating condition
Return to the original
operating condition
Return to the original
operating condition
Disassemble and repair, or
replace
Overhaul seawater pump and
check for clogged seawater
path
6LPA Service Manual