Suzuki GA413, Service Manual

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6-28 ENGINE GENERAL INFORMATION AND DIAGNOSIS
GA413
supple
Condition Possible Cause Reference Item
Excessive engine oil
consumption
Oil entering combustion chamber
Sticky piston ring
Worn piston and cylinder
Worn piston ring groove and ring
Improper location of piston ring gap
Worn or damaged valve stem seal
Worn valve stem
Piston and cylinder in Section 6A.
Cylinders, pistons and piston rings in
Section 6A.
Pistons and piston rings in Section 6A.
Pistons installation in Section 6A.
Valves and cylinder head in Section
6A.
Valves inspection in Section 6A.
Low oil pressure Improper oil viscosity
Malfunctioning oil pressure switch
Clogged oil strainer
Functional deterioration of oil pump
Worn oil pump relief valve
Excessive clearance in various sliding parts
ITEM1-4 Engine oil and oil filter change
in Section 0B.
Oil pressure switch in Section 8.
Oil pan and oil pump strainer in Section
6A.
Oil pump in Section 6A.
Oil pump in Section 6A.
Refer to Section 6A.
Engine noise
Note: Before check-
ing the mechanical
noise, make sure that:
Ignition timing is
properly adjusted.
Specified spark plug
is used.
Specified fuel is used.
Valve noise
Improper valve lash
Worn valve stem and guide
Weak or broken valve spring
Warped or bent valve
Loose camshaft housing bolts
Piston, ring and cylinder noise
Worn piston, ring and cylinder bore
Connecting rod noise
Worn crankpin bearing
Worn crankpin
Loose connecting rod nuts
Low oil pressure
Crankshaft noise
Low oil pressure
Worn crankshaft journal bearing
Worn crankshaft journal
Loose lower crankcase (bearing cap) bolts
Excessive crankshaft thrust play
Valve lash in Section 6A.
Valves and cylinder head in Section
6A.
Valve springs in Section 6A.
Valves and cylinder head in Section
6A.
Camshaft in Section 6A.
Pistons and cylinders in Section 6A.
Crankpin and connecting rod bearing in
Section 6A.
Crankpin and connecting rod bearing in
Section 6A.
Connecting rod in Section 6A.
Previously outlined.
Previously outlined.
Crankshaft and bearing in Section 6A.
Crankshaft and bearing in Section 6A.
Crankshaft in Section 6A.
Crankshaft in Section 6A.