Nissan 13231-7S002 Lifter-Valve

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Disengage the camshaft sprockets from the timing chains and support them with wire to prevent falling into the timing chain cover.

Mark the relationship of the timing chains to the camshaft sprocket marks.

Avoid laying the lifters on their side or upside down to prevent air from being trapped inside; they can only be laid on their side if submerged in clean engine oil.

The remainder of the installation follows the reverse order of removal, and if any part of the valve train was replaced, check and adjust the valve clearance.

Inspect the contact and sliding surfaces of each lifter for wear and scratches. If the lifter pad is worn, it's advisable to check the corresponding camshaft lobe or adjusting shim on DOHC engines, as it will likely be worn too. Caution: On SOHC engines, do not lay the lifters on their side or upside down, as air can become trapped inside, requiring the lifter to be bled. Lifters can only be laid on their side if submerged in a pan of clean engine oil until reassembly.