10/25/2014
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J 39313 Spark Plug Port Adapter. See Special Tools .
ON-VEHICLE REPAIR INSTRUCTIONS > VALVE STEM OIL SEAL AND VALVE SPRING
REPLACEMENT - LEFT SIDE > REMOVAL PROCEDURE
1. Remove the starter motor. Refer to Starter Motor Replacement (LY7) or Starter Motor
Replacement (LH2) or Starter Motor Replacement (LC3) .
IMPORTANT: If the EN 46106 is not
installed, the crankshaft may rotate. See Special
Tools . If the crankshaft rotates, disassembly
and reassembly of the entire camshaft timing
system may be required.
2. Install the EN 46106 in order to prevent crankshaft rotation. See Special Tools .
Fig 1: View Of Tool EN 46106
Courtesy of GENERAL MOTORS CORP.