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Page 53
Section 6
DIAGNOSTIC TESTS
Page 53
5. Set voltmeter to measure DC voltage.
6. Remove Wire 15 from the Start-Run-Stop Switch (SW1).
Connect the positive meter test lead to Wire 15. Connect the
negative meter test lead to frame ground. 12 VDC should be
measured.
RESULTS:
Repair or replace any wiring that did not have continu-
ity.
If voltage was not measured in Step 6 repair wiring
between the Starter Contactor Relay (SCR) and the
Start-Run-Stop Switch (SW1).
If all steps passed repair or replace Wire 16 between
the Starter Contactor (SC) and the Starter contactor
Relay (SCR).
TEST 29 - CHECK IGNITION SPARK
PROCEDURE:
A commercially available spark tester may be used
to test the engine ignition system. One can also be
purchased from Generac Power Systems (Part No.
0C5969).
1. Disconnect a high tension lead from a spark plug.
2. Attach the high tension lead to the spark tester terminal.
3. Ground the spark tester clamp by attaching to the cylinder
head (see Figure 6-37).
4. Crank the engine rapidly. Engine must be cranking at 350 rpm
or more. If spark jumps the tester gap, you may assume the
ignition system is working properly. Repeat on remaining cylin
-
der spark plug.
5. If spark jumps the tester gap intermittently, the problem may be
in the Ignition Magneto.
Figure 6-37. – Testing Ignition System
Figure 6-38. – Checking Engine Miss
RESULTS:
Refer back to the Flow Chart
TEST 30 - CHECK SPARK PLUGS
PROCEDURE:
Remove spark plugs. Clean with a commercial sol-
vent. DO NOT BLAST CLEAN SPARK PLUGS.
Replace spark plugs if badly fouled, if ceramic is
cracked, or if badly worn or damaged. Set gap to
0.040 inch (1.016 mm). Use a Champion RC14YC (or
equivalent) replacement spark plug.
SET PLUG GAP AT 0.040 inch
(1.016 mm)
Figure 6-39. – Setting Spark Plug Gap
RESULTS:
1. Clean and regap or replace sparks plug as necessary.
2. Refer back to the Flow Chart.