Mitsubishi FUSO FH 1997, Service Manual

Page: 155 / 200

11-6
TROUBLESHOOTING
Symptoms
Remarks
Decrease of power Engine noise abnormal
Possible causes
Oil viscosity unsuitable
● ^
Gr 12
Fuel incorrect or unsuitable
●
Valve clearance faulty
● ●
Head gasket faulty
● ●
Valve and valve seat worn, and carbon deposits
● ●
Valve spring fatigued
● ●
Piston ring worn or damaged
● ●
Piston ring grooves worn or damaged
● ●
Injection timing faulty
● ● ^
Gr 13
Injection pump malfunctioning
● ● ^
Gr 13
Cooling system malfunctioning
● ^
Gr 14
Injection nozzle malfunctioning
● ●
^
Gr 13
Fuel system sucking air
● ^
Gr 13
Air cleaner mesh clogged
● ^
Gr 15
Muffler clogged
●
^
Gr 15
Pipe and hose installation faulty
●
Ancillary equipment (injection pump, alternator, etc.) or installation faulty
^
Gr 13
●
^
Gr 54
V-belt loose or damaged
● ^
Gr 14
Crankshaft pulley mounted incorrectly
●
Air cleaner or muffler malfunctioning
● ^
Gr 15
Rocker shaft and bracket faulty
●
Rocker shaft bracket lubrication faulty
●
Timing gear backlash faulty
●
Timing gear system and idler shaft lubrication faulty
●
Connecting rod small end bushing worn and piston pin worn
●
Crankshaft pin and big end bearing of connecting rod worn or damaged
●
Crankshaft journal and main bearing worn or damaged
●
Crankshaft and camshaft end play excessive
●
Tappet and camshaft worn
●