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 ●
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