Generac Power Systems OHVI GSH 190, Руководство по обслуживанию

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2-2
SeCTIoN 2: IGNITIoN
FLYWHEEL INSTALLATION:
Align the keyway in the flywheel with the woodruff key on
the crankshaft. Install the flywheel, the starter cup and the
conical washer. Install the flywheel nut and tighten to the
proper torque.
NOTE: The conical washer must be installed in the proper
direction (see Figure 2-4) with the convex side facing out
(away from the flywheel).
WOODRUFF KEY
FLYWHEEL
FLYWHEEL
STARTER CUP
STARTER
CUP
CONICAL
WASHER
FLYWHEEL
NUT
FLYWHEEL
NUT
CONVEX SIDE OF CONICAL
WASHER FACING OUT
Figure 2-4. Exploded View of Flywheel Assembly
TeSTING THe IGNITIoN SYSTeM
The condition of the ignition system can be accurately
diagnosed using an ignition tester, (Generac P/N 0C5969) as
follows:
. Disconnect the high tension lead from the spark plug.
2. See Figure 2-5. Attach the spark tester clamp to the engine
cylinder head (frame ground). Attach the spark plug high
tension lead to the tester terminal.
. Crank the engine rapidly. If spark jumps the gap of the
spark tester, you may assume the ignition system is operat-
ing satisfactorily.
Figure 2-5. Testing Ignition System
NOTE: If the flywheel key is sheared or partially sheared,
spark can jump the tester gap. However, loss of correct
ignition timing may result in hard starting or no start-
ing at all.
. To determine if an engine miss is ignition related, connect
the spark tester in series with the high tension lead and the
spark plug (Figure 2-6). Then, test the system as follows:
a. Start the engine.
b. If spark jumps the tester gap regularly but the miss contin-
ues, the problem is in the spark plug or in the fuel system.
A spark miss will be readily apparent.
Figure 2-6. Checking for Engine Miss
NOTE: The ignition system described in this section is
typically used on horizontal shaft engines. The ignition
system used on all vertical shaft (RV) engines differs from
that of horizontal shaft engines. See "SERVICE MANUAL
COMPUTER CONTROLLED VARIABLE SPEED RV GENERA-
TORS," Manual Part No. 094468-A.
0C1103Arev0.indd 2 6/22/2006 10:49:40 AM