Spark Plug Visual Diagnosis

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Follow the Scheduled Maintenance Service Recommendations, given in SECTION 0B, to assure satisfactory spark plug performance.

Normal spark plug operation will result in brown to grayish-tan deposits appearing on the portion of the plug that projects into the cylinder area. A small amount of red-...

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Service Manual Table of Contents

Document Tags

Document Title: Spark Plug Visual Diagnosis

service

section

spark

plug

normal

operation

result

brown

deposits

portion

cylinder

material

insulator

center

electrode

wear

occur

misfiring

ignition

fuel

mixture

proper

conditions

engine

indicated

poor

operating

fouling

excessive

cracked

broken

cause

speeds

over

valve

improper

installation

torque

seats

contact

heat

damage

regapping

shock

tool

crack

portion plug

fouling plug

plug cylinder

heat shock

fouling plug indicated

portion plug cylinder

result poor contact

poor contact seats

cracked broken insulators