TIMING CHAIN
EM-63
< REMOVAL AND INSTALLATION >
[VQ40DE]
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Mating marks between timing chain and sprockets slip easily. Confirm all mating mark positions
repeatedly during the installation process.
a. Push plunger of timing chain tensioner (secondary) and keep it
pressed in with stopper pin.
NOTE:
Use stopper pin included with Tool J-50246.
b. Before installing timing chains (secondary) and camshaft
sprockets, confirm mating marks are visible. If necessary, use
paint or equivalent to re-mark the camshaft sprockets at each
mating mark.
c. Install timing chains (secondary) (8) and camshaft sprockets
[INT (1) and EXH (9)].
• Left bank mating marks (6)
• Align the timing chain mating marks (secondary) (2) (blue
color link) with the ones on camshaft sprockets (INT and EXH)
(4), (5), (7) and (10) (punched), and install them.
NOTE:
• Mating marks for camshaft sprocket (INT) are on the back
side of camshaft sprocket (secondary).
• There are two types of mating marks, circle (7), (10) and
oval (4), (5) types. They should be used for the right and left
banks, respectively.
• Align dowel pin (3) and pin hole on camshafts with the groove
(11) and dowel pin on sprockets, and install them.
• On the intake side, align pin hole on the small diameter side of
the camshaft front end with dowel pin (3) on the back side of
camshaft sprocket, and install them.
• On the exhaust side, align dowel pin on camshaft front end
with pin groove (11) on camshaft sprocket, and install them.
• In case that positions of each mating mark and each dowel pin
do not fit on mating parts, make fine adjustment to the position by slightly turning camshaft(s).
• Bolts for camshaft sprockets must be tightened in the next step. Tightening them by hand is enough to
prevent the dislocation of dowel pins.
d. Confirm the mating marks are aligned, then finger tighten camshaft sprocket bolts. Final tightening will be
done with all timing chains installed.
SEM430G
SEM811G
Right bank : Use circle type (7) and (10).
Left bank : Use oval type (4) and (5).
WBIA0689E
Revision: January 2013 2013 Xterra
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