DSG-423 GENERAL INFORMATION
01-39
Spark Plug Thread Repair
CAUTION: The cylinder head must be removed from
the engine before installing a tapersert. If this pro-
cedure 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.
Special Tool(s)
Tapersert Installation Kit
107-R0921 or Equivalent
Feeler Gauge
D81L-4201-A or Equivalent
Special Service Tools called for
by the procedures can be
obtained by calling:
1-800-ROTUNDA
(1-800-768-8632)
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