Sentra L4-2.5L (QR25DE) (2003)
b. Attach a pulley puller in the M 6 (0.24 in diameter) thread hole on crankshaft pulley, and remove crankshaft pulley.
16. Remove the front cover with the following procedure:
a. Loosen the mounting bolts in the numerical order as shown, and remove them.
b. Remove the front cover.
CAUTION: Be careful not to damage the mounting surface.
17. If the front oil seal needs to be replaced, lift it out with a screwdriver to remove it.
18. Remove timing chain with the following procedure:
a. Push in the tensioner plunger. Insert a stopper pin into the hole on the tensioner body to hold the chain tensioner.
Use a wire of 0.5 mm (0.02 inch) diameter as a stopper pin.
b. Remove the chain tensioner.