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13- ENGINE PROBLEM DIAGNOSTIC CAUSE
The engine doesn't start
The engine doesn't idle
The engine doesn't reach the maximum rpm Wrong carburetion
Engine revs up when idling
TIGHTENING TORQUE VALUE for ENGINE BOLTS and SCREWS
HEAD NUTS
HEAD NUTS
TRACTOR PULLEY CRANKSHAFT NUT (NO CLUTCH)
CLUCTH CRANCKSHAFT NUT
IGNITION CRANKSHAFT NUT (ELECTRIC STARTER)
ALUM. FLYWHEEL CRANKSHAFT NUT (NO ELECTRIC STARTER)
FLANGE NUTS BELT STRETCHING
VIBRATION-DUMPING ENGINE NUTS
PROPELLER CENTRAL SCREW (left tread)
SPARK PLUG
CRANKCASE SCREWS
CARBURETOR LOCKING SCREWS
INTAKE MANIFOLD LOCKING SCREWS
MUFFLER STUDS NUTS
SILENCER LOCKING SCREWS
MUFFLER LOCKING SCREWS
STANDARD TIGHTENING TORQUE VALUE
5mm Bolts and nuts
6mm Bolts and nuts
8mm Bolts and nuts
10mm Bolts and nuts
12mm Bolts and nuts
Out of petrol
Petrol doesn't reach the carburetor Check the fuel system circuit
Old or wrong petrol
Flooded engine
Defective spark plug
Blackened or wet spark plug
Earth switching off cable
Spark plug hood wrong installed
Carburetor has problems
No spark
Dirty carburetor
Out-of-adjustment screws
Defective spark plug
The carburetor has problems
The reed valve has problems
Dirty air filter
Dirty exhaust
Out-of-adjustment screws
Air through the gaskets
M
6
8
14
20
12
10
7
8
8
6
6
6
8
8
8
N.m
6
10
25
45
55
SOLUTION
Add petrol
Empty the tank and the fuel system circuit and replace the
petrol.
Remove the spark plug, start the engine, dry or replace the
spark plug.
Replace it
Clean and dry the spark plug or replace it
Check the tightening
Check it
Clean and check it; eventually replace the diaphragm
Check the ignition, coil and wiring
Clean and check the carburetor
Calibrate the carburetor again
Replace it
Calibrate the carburetor
Clean and check it; eventually replace the diaphragm
Replace the reeds or the whole reed valve
Clean or replace it
Clean or replace the deadening material
Calibrate the carburetor
Replace the gaskets and seals
N.m
Kgf.m
12
1,2
18
1,8
80
8
100
10
80
8
40
4
14
1,4
16
1,6
25
25
20
2
8
0,8
8
0,8
8
0,8
25
1
15
1,5
15
1,5
Kgf.m
Lbf.ft
0,6
4,44
1
7,40
2,5
18,50
4,5
33,30
5,5
40,70
17
Lbf.ft
Locking compound
8,8
13,2
59
74
59
29,5
10,3
11,8
18,5
LOCTITE 243
14,8
5,9
5,9
5,9
7,4
LOCTITE 270
11,1
LOCTITE 243
11,1
LOCTITE 243
ENGLISH
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