Altima 2.5 L4-2.5L (QR25DE) (2002)
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Install by lining up mating marks on each sprocket and timing chain as shown.
NOTE: Before installing chain tensioner, it is possible to change the position of mating mark on timing chain for that of each sprocket for
alignment.
CAUTION: For the above reason, after the mating marks are aligned, keep them aligned by holding them with a hand.
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Before and after installing chain tensioner, check again to make sure that mating marks have not slipped.
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After installing chain tensioner, remove stopper pin, and make sure the tensioner moves freely.
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To avoid skipped teeth, do not move crankshaft and camshaft until front cover is installed.
6. Install front oil seal to front cover.
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Using a drift of 56 mm (2.20 inch) diameter, press oil seal in until it is flush with front end surface of front cover.
CAUTION:
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Be careful not to cause damage to circumference of oil seal.
7. Install front cover with the following procedure:
a. Install O-rings to cylinder head and cylinder block.
