Mercury 9L3Z-6250-A Camshaft

Remove the timing chains, camshaft sprockets, and spacers.

Before starting the engine, change the oil, install a new oil filter, and refill the cooling system.

Rotate the camshafts to position the dowel pins in their proper positions for installing the VCT units and secondary timing chains.

Remove the camshaft sprockets, locking the camshaft in position with a special tool before loosening the sprocket bolt. CAUTION: Don't mix up the sprockets; make an identification mark on each sprocket using paint for correct reassembly. Mark the camshaft cap clusters with front and rear indications for both the left and right cylinder heads. Loosen the bearing cap bolts only 1/4-turn at a time, following the reverse of the tightening sequence, until they can be removed by hand. Remove the caps and lift the camshaft off the cylinder head, tapping lightly under the camshaft caps if necessary. Repeat this procedure for the remaining camshaft.

Align the camshaft keyway straight down (6 o'clock position) and ensure the balance shaft drive gear aligns with the smaller gear on the balance shaft.