Yanmar 3TNV Series Service Manual page 70

Trouble symptom
Cause
Excessive cooling effect of radiator
Insufficient cooling effect of radiator
Insufficient coolant water level
Cracked water jacket
Slackened fan belt
Defective thermostat
Improper properties of lubricating oil
Leakage from lubricating oil piping system
Insufficient delivery capacity of trochoid pump
Clogged lubricating oil filter
Defective pressure regulating valve
Insufficient lubricating oil level
Too early timing of fuel injection pump
Too late timing of fuel injection pump
Improper properties of fuel oil
Water entrance in fuel system
Clogged fuel filter
Air entrance in fuel system
Clogged or cracked fuel pipe
Insufficient fuel supply to fuel injection pump
Uneven injection volume of fuel injection pump
Excessive fuel injection volume
Poor spray pattern from fuel injection nozzle
Priming failure
Clogged strainer at feed pump inlet
Poor
Insufficient
Starting failure exhaust
engine output
color
Engine starts
Exhaust During
but stops
color work
soon.
Exhaust
smoke
Cooling
Hunting Lubricating oil
water
55
Air
intake
Corrective action
Defective thermostat (kept closed) (See 2.2.7 in Chapter2.)
Defective thermostat (kept opened)(See 2.2.7 in Chapter2.)
or slipping fan belt (See 2.2.2-2) in Chapter2.)
Check water leakage from cooling water system.
(See 2.2.1-4) in Chapter2.)
Repair or replace.
Adjust the belt tension. (See 2.2.2-2) in Chapter2.)
Check or replace. (See 2.2.7 in Chapter2.)
Use proper lubricating oil. (See 1.3.2 in Chapter1.)
Repai r.
Check and repair. (See 5.5 in Chapter5.)
Clean or replace.
Clean, adjust or replace.
Add proper lubricating oil. (See 2.2.1-3) in Chapter2.)
Check and adjust. (See 2.2.7-4) in Chapter2.)
Check and adjust. (See 2.2.7-4) in Chapter2.)
Use proper fuel oil. (See 1.3.1 in Chapter1.)
Perform draining from the fuel filter. (See 2.2.3 and 2.2.5 in Chapter2.)
Clean or replace. (See 2.2.5 in Chapter2.)
Perform air bleeding. (See 2.2.3 in Chapter2
Clean or replac e.
Check the fuel tank cock, fuel filter, fuel pipe, and fuel feed pump.
Check and adjust.
Check and adjust.
Check and adjust. (See 2.2.6 in Chapter2.)
Foreign matter trapped in the valve inside the priming pump.
(Disassemble and clean.)
Clean the straine r.
3. Troubleshooting
.)