CAUTION: When aligning timing marks, always rotate engine by turning the crankshaft. Failure to do so will result in valve and/or piston damage.
CAUTION: When the timing chain is removed and the cylinder heads are still installed, DO NOT rotate the camshafts or crankshaft without first locating the proper crankshaft position. Failure to do so will result in valve and/or piston damage.
NOTE: When camshaft sprocket bolts are removed, the camshafts will rotate in a clockwise direction.
NOTE: Lubricate timing chain and guides with engine oil before installation.
NOTE: The camshaft sprockets can be allowed to float on the camshaft hub during installation.
NOTE: Inspect oil ring on chain guide access plug before installing. Replace O-ring as necessary.
NOTE: To reset the primary timing chain tensioner, engine oil will first need to be purged from the tensioner Timing Chain Tensioner - Oil Purging
NOTE: If oil was not first purged from the tensioner, use slight finger pressure to assist the center arm pin of Special Tool 8186 to unseat the tensioner's check ball.
CAUTION: Ensure the tensioner is properly reset. The tensioner body must bottom against the top edge of Special Tool 8186. Failure to properly perform the resetting procedure may cause tensioner jamming.
NOTE: After installation of a reset tensioner, engine noise will occur after initial start-up. This noise will normally disappear within 5 - 10 seconds.
Correct timing is critical for the NON free-wheeling designed, 2.7L engine. Engine timing can be verified by using the following procedures: