Generac Power Systems 17 kW LP 사용자 설명서

sEctioN 4.4

DiaGNostic tEsts

Page 139

PROCEDURE, ADJUSTING MAGNETO FLYWHEEL GAP:
note: the  air  gap  between  the  ignition  magneto
and the flywheel on single cylinder engines is not
adjustable.  proceed  directly  to  Step  10  for  single
cylinder  engines.  For V-twin  engines,  proceed  as
follows.

1. See Figure 34. Rotate the flywheel until the magnet is

under the module (armature) laminations.

2. Place a 0.008-0.012 inch (0.20-0.30mm) thickness

gauge between the flywheel magnet and the module

laminations.

note: a business card is approximately 0.010
inch thick.

3. Loosen the mounting screws and let the magnet pull the

magneto down against the thickness gauge.

4.  Tighten both mounting screws.
5.  To remove the thickness gauge, rotate the flywheel.
6.  Repeat the above procedure for the second magneto.

0.008-0.012" GAUGE

MAGNETO

Figure 34. Setting Ignition Magneto (Armature)

Air Gap

7. Repeat Test 70 and check for spark across the spark

tester gap

a. A spark test may be conducted with unit dis-

sembled by following this procedure.

b. Battery must be connected.

c. J2 Connector must be connected to the printed

circuit board.

d. Remove Wire 56 from the SCR located beneath

the printed circuit board.

Warning: make sure all debris is cleared from the
engine compartment and all body parts are clear
from flywheel before proceeding.

e. Refer to Test 70 to check for spark.

f. Utilizing a jumper wire, connect a wire to the

15B terminal block. Connect the other end to

where Wire 56 was disconnected in Step 7. The
engine should crank once the jumper from 15B
is connected.

8. If spark was not indicated, replace magnetos.

note: if gap is only adjusted, ensure to properly
test  the  magnetos  by  cranking  the  engine  over
before  reassembly  occurs.  Spark  should  be
present  on  both  cylinders  before  reassembly
should be completed.

9. If air gap was not out of adjustment, test ground wires.
10. Set a VOM to the measure resistance.
11. Disconnect the engine wire harness from the ignition

magnetos (Figure 35).

a. On V-twin generators, remove Wire 18 from the

stud located above the oil cooler. See Figure 45.

b. On single cylinder generators, disconnect Wire

18 at the bullet connector. See Figure 44.

SPARk PLUG

WIRE 18 TO

CIRCUIT BOARD

STUD CONNECTOR

ENGINE

WIRE

HARNESS

REMOVE LEADS

Figure 35. Engine Ground Harness

12. Connect one meter test lead to one of the wires removed

from the ignition magneto(s). Connect the other test

lead to frame ground. INFINITY should be measured. If

CONTINUITY is measured, replace the shutdown harness.

13. Now check the flywheel magnet by holding a screwdriver

at the extreme end of its handle and with its point down.

When the tip of the screwdriver is moved to within 3/4

inch (19mm) of the magnet, the blade should be pulled

in against the magnet.

14. For rough running or hard starting engines check the fly-

wheel key. The flywheel's taper is locked on the crankshaft

taper by the torque of the flywheel nut. A keyway is provided

for alignment only and theoretically carries no load.

note: if the flywheel key becomes sheared
or even partially sheared, ignition timing can
change. incorrect timing can result in hard start-
ing or failure to start.

15. As stated earlier, the armature air gap is fixed for single

cylinder engine models and is not adjustable. Visually

inspect the armature air gap and hold down bolts.

DC CONTROL

Part 4