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6. Clean the Spark Plugs
Clean the ignition lead, cable ends, spark plug walls, and ceramic of the spark plugs (new or
A.
reused) as per the spark plug manufacturer's instructions.
Wipe the spark plug lead connector clean using a lint-free cloth moistened with MEK,
B.
acetone, wood alcohol or naphtha.
Remove all cleaning residue from the spark plug.
C.
Dry all parts using compressed air.
D.
7. Set Spark Plug Gap
The spark plug must be clean before the gap can be reset.
A.
Make sure that the inside of the spark plug barrel is clean and dry and does not have any
B.
residue from cleaning.
Reset and test the spark plugs in accordance with the spark plug manufacturer's instructions.
C.
8. Spark Plug Rotation
NOTICE: Rotate spark plug locations when the operational ground check indicates evidence of
spark plug fouling.
Remove all of the spark plugs. Refer to the "Remove the Spark Plug" procedure in this
A.
chapter.
Examine each spark plug and ignition lead. Refer to the "Examine Spark Plugs and Ignition
B.
Leads" procedure in this chapter.
Clean acceptable spark plugs. Refer to the "Clean the Spark Plugs" procedure in this chapter.
C.
Rotate the spark plugs by moving the bottom plugs to the upper position.
D.
Install acceptable spark plugs in new locations as per the rotation scheme identified in Table
E.
2 below. Refer to the "Spark Plug Installation" procedure in this chapter.
9. Spark Plug Installation
Refer to the latest revision of Service Instruction No. 1042 to identify the correct long-reach
spark plug for this engine.
Sparingly apply Anti-seize to all spark plug threads, except the first thread.
A.
Set the spark plug gage at 0.016 to 0.022 in. (0.406 to -0.559 mm).
B.
74-20
Page 166
Spark Plug Rotation Scheme
#1 Top
#2 Top
#3 Top
#4 Top
YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
Table 2
with
#4 Bottom
with
#3 Bottom
with
#2 Bottom
with
#1 Bottom
© 2021 Avco Corporation. All Rights Reserved
February 2021
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