TROUBLE SHOOTING
30
November 2004 / WHISPER 6 / 12 Mobile / EN
Resistance Whisper 6 ULTRA
50Hz-230V
• Resistance both main stator windings
0.77 Ohm
in series
• Resistance both rotor windings
2,00 Ohm
• Resistance exciter stator winding
1.91 Ohm
5.3.4 Meggering
One can try to measure resistance between the housing and
the windings with a multimeter which should read infinitely.
When readings indicate infinity but a fault is suspected
one can do a high voltage resistance test (MEGGERING)
This procedure should be carried out by an expert
5.4
SPECIAL PROCEDURES ENGINE
5.4.1 Setting the RPM
RPM is set by the manufacturer and should not need
readjustment! However a very slight offset after running
in could occur. RPM can be measured by a frequency
meter. Before readjustment check any other explanation
for the wrong speed. Engine speed is set at the factory
at nominal 1500 RPM (50 Hz). A RPM drop of 5% at full
load is acceptable. Therefore a no load setting should be
at + 1575 RPM = 52.5 Hz.
Under no circumstances should the RPM be under full
load below 1470 RPM = 49 Hz. When no cause can be
found for a wrong speed, the setting can be adjusted:
It is very important to identify the correct setting assem-
bly (refer to fig. 18).
The screw is to be locked in position with the lock-nut.
5.4.2
Adjusting valve clearance and retightening the
cylinder head bolts.
Both procedures has to be executed with a cold engine.
When both procedures are executed be sure to retighten
the cylinder head bolts before adjusting the valve clea-
rance.
When retightening the cylinderhead bolts, drain the coo-
lant by removing the drain plug (ref. to fig. 2).
Loosen the bolts slightly, remove the rocker assembly
(the rocker arms, shaft, and stays) and then retighten the
bolts to the specified torque in the numerical order
illustrated (ref. to fig. 19).
Tightening torque:
M10 bolt 75-85 Nm
M8 bolt 20-30 Nm
Rocker stay tightening torque:
M8 bolt 15-22 Nm
The clearance of both valves intake and exhaust should
be 0.25 mm in cold condition. Set the piston of the first
cylinder to be adjusted to top dead centre (T.D.C.) of
compression stroke.
The T.D.C. of compression stroke can be found by
aligning the T.D.C. mark (notch) on the crankshaft pulley
with the mark on the gear case (ref. to fig. 20).
First align the the T.D.C. mark for the No. 1 cylinder.
Confirm that the valves do not move up or down when
the crankshaft is turned about 20 degrees in normal and
reverse direction of rotation.
1
2
3
Fig. 20.
2= adjustment screw RPM
3= manual stop
6
3
5
7
4
2
8
1
Fig. 21a.
Whisper 6000/8000
11
7
5
10
9
4
6
2
1
3
8
Fig. 21b.
Whisper 12000
1
2
Fig. 22a.
2 cylinder engine
1
2
3
Fig. 22b.
3 cylinder engine
