Table of Contents
Advertisement
YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
74-20 - IGNITION SYSTEM - SPARK PLUG MAINTENANCE
FAILURE TO MAINTAIN THE SPARK PLUGS AND IGNITION LEADS
CAN CAUSE ENGINE DAMAGE OR FAILURE.
The ignition leads are an all-weather, shielded wire constructed with over braid.
1. Examine the Ignition Lead Routing
A. Examine the ignition leads for signs of chafing, cracks in the all-weather shielding, or worn
leads. Replace the harness if any leads show chafing, cracks, or wear.
B. Examine the ignition lead connections. Make sure the ignition lead connections are secure.
C. Tighten the leads if any connections are loose.
D. Make sure the ignition lead mounting clamps are tight.
2. Remove the Spark Plug
A. Make sure that the power is disconnected from the engine.
B. Make sure that the engine is cool to the touch.
C. Identify and tag the location of all the spark plugs (Figure 1).
D. Hold the ferrule and loosen the spark plug nut.
HOLD FERRULES WHILE LOOSENING THE SPARK PLUG COUPLING
NUT TO PREVENT TWISTING CONDUIT OR CABLE.
E. Use a 6-point deep recess socket on top of the spark plug and rotate the socket to remove the
spark plug from the engine cylinder head.
F. Remove and discard the spark plug and gasket.
© 2021 Avco Corporation. All Rights Reserved
February 2021
Figure 1
Champion Electronic Ignition System
74-20
Page 163
Advertisement
Table of Contents
