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WSG-1068 GENERAL INFORMATION
Spark Plug Thread Repair
Special Tool(s)
CAUTION: The cylinder head must be removed from
the engine before installing a tapersert. If this
procedure is done with the cylinder head on the
engine, the cylinder walls can be damaged by metal
chips produced by the thread cutting process.
CAUTION: Do not use power or air-driven tools for
finishing taperserts.
NOTE: This repair is permanent and will have no effect
on cylinder head or spark plug life.
1. Clean the spark plug seat and threads.
2. Start the tap into the spark plug hole, being
careful to keep it properly aligned. As the tap
begins to cut new threads, apply aluminum
cutting oil.
3. Continue cutting the threads and applying oil
until the stop ring bottoms against the spark plug
seat.
4. Remove the tap and metal chips.
5. Coat the threads of the mandrel with cutting oil.
Thread the tapersert onto the mandrel until one
thread of the mandrel extends beyond the
tapersert.
NOTE: A properly installed tapersert will be either flush
with or 1.0 mm (0.039 inch) below the spark plug gasket
seat.
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