Suzuki GA413 Service Manual page 804

6-28 ENGINE GENERAL INFORMATION AND DIAGNOSIS
Condition
Excessive engine oil
consumption
Low oil pressure
Engine noise
Note: Before check-
ing the mechanical
noise, make sure that:
D Ignition timing is
properly adjusted.
D Specified spark plug
is used.
D Specified fuel is used.
Possible Cause
Oil entering combustion chamber
D Sticky piston ring
D Worn piston and cylinder
D Worn piston ring groove and ring
D Improper location of piston ring gap
D Worn or damaged valve stem seal
D Worn valve stem
D Improper oil viscosity
D Malfunctioning oil pressure switch
D Clogged oil strainer
D Functional deterioration of oil pump
D Worn oil pump relief valve
D Excessive clearance in various sliding parts
Valve noise
D Improper valve lash
D Worn valve stem and guide
D Weak or broken valve spring
D Warped or bent valve
D Loose camshaft housing bolts
Piston, ring and cylinder noise
D Worn piston, ring and cylinder bore
Connecting rod noise
D Worn crankpin bearing
D Worn crankpin
D Loose connecting rod nuts
D Low oil pressure
Crankshaft noise
D Low oil pressure
D Worn crankshaft journal bearing
D Worn crankshaft journal
D Loose lower crankcase (bearing cap) bolts
D Excessive crankshaft thrust play
Reference Item
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.
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.
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.