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TROUBLE SHOOTING
40
February 2020 / W-SQ-Pro 15/10.8 / W-SQ-Pro 18/15,5
5.4
SPECIAL PROCEDURES ENGINE
5.4.1 Setting the RPM
RPM is set by the manufacturer and should not need
readjustment! When adjustments are necessary this can
only be done with the help of an interface to a computer and
special software to get access to the microprocessor. If
readjustment of the RPM is necessary, please contact your
Whisper Power Service Centre for advice.
5.4.2 Adjusting valve clearance and
retightening the cylinder head bolts.
Both procedures have to be carried out with a cold engine.
When both procedures are carried out be sure to retighten
the cylinder head bolts before adjusting the valve clearance.
When retightening the cylinder head bolts, drain the coolant
by removing the drain plug (ref. to fig. 4 - 7).
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. 28).
Tightening torque:cylinder head bolt
88 ± 5Nm
Rocker stay tightening torque:
14.7 ± 2Nm
Fig. 28: Cylinder head bolts
The clearance of both (intake and exhaust) valves 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. 29).
First align 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.
Fig. 29
If the rocker arms move piston no.1 is on the T.D.C. of the
intake or exhaust stroke. In such case turn the crankshaft
360° in the direction of engine rotation again. No. 1 piston
is now at T.D.C. of the compression stroke.
After adjusting the valves of cylinder 1 adjust the valve
clearance of the remaining cylinders in firing order 1 – 3 – 4
– 2. Turn the crankshaft 180 degrees clockwise from the
T.D.C of cylinder 1 to the T.D.C of cylinder 3. and turn the
crackshaft 180 degrees further clockwise to the TDC of
cylinder 4 and adjust the valves. And again 180 degrees to
adjust cylinder 2.
FRONT
MOTOR
Mark on timing gearcase
IT (injection timing)
mark
TDC mark piston 1
TDC mark piston
2 and 3