Yanmar 3YM30, Service Manual

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3.
Tr
ou
bleshooting
51
TROUBLE AND TROUBLESHOOTING
(I-1) Add fuel oil and prime.
Chart 1
THE ENGINE SUDDENLY STOPS.
Countermeasure
Cause and Ef
fect
Countermeasure
(I-2) Bleed air.
(II-1) Replace.
(II-2) Clean carefully to insure good working order.
(I-3) Remove water from drain and fuel oil system and prime.
(I-4) Check and make necessary repairs.
(I-7) Check and make necessary repairs.
(I-5) Clean.
(I-6) Replace.
(III-1) Tighten adjustment valve.
(III-2) Clean. (IV-1) Remove and repair or replace.
Disassemble and clean cooling water pump and check cooling
water system. (IV-2)
(III-3) Tighten safety valve.
(III-4) Remove and repair or replace.
(III-5) Return to original condition.
(I) Fuel oil supply cut off
(III) Emergency stoppage device in operation (IV) Miscellaneous
(1) Insufficient oil in fuel oil tank
(1) Loose lube oil pressure adjustment valve
(2) Clogging of lube oil filter
(3) Water in fuel oil tank
Relay operation triggered by low lube
oil pressure (5)
(4) Trouble with lube oil pump
(3) Leakage from lube oil safety valve
(4) Fuel oil cock closed
(5) Clogging of fuel oil filter
(6) Damage in fuel oil system
(7) Problem with fuel feeding pump
(2) Air in fuel oil system and fuel injection pump
(II) Governor trouble
THE ENGINE
SUDDENLY STOPS.
(2) Overloading due to insufficient
cooling water
(1) Seizure of moving parts
(2) Sticking of governor sleeve
(1) Damage to governor spring