Jeep 1987 Wrangler Workshop Manual page 365

ENGINES
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4.2 LITER (258 CID) SIX-CYLINDER ENGINE
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TIMING CHAIN REMOVAL
NOTE: Installation of the timing chain with the
timing marks on the crankshaft and camshaft
sprockets properly aligned ensures correct
valve timing. A worn or stretched timing chain
will adversely affect valve timing. If the timing
chain deflects more than 12.7mm (1/2-in)
replace it. The correct timing chain has 48 pins.
A chain with more than 48 pins will cause
excessive slack.
Remove the drive belt(s).
Remove the engine fan and hub (or Tempatrol
fan) assembly.
Remove the vibration damper pulley (V-belt
drive only).
Remove the vibration damper. Refer to the
removal procedure.
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Remove the timing case cover. Refer to the
removal procedure.
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Remove the oil seal from the timing case cover.
Remove the camshaft sprocket retaining bolt
and washer.
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