Timing Chain: Installation

• Camshaft dowel pin hole (intake side): At cylinder head upper face side in each bank. 
• Camshaft dowel pin (exhaust side): At cylinder head upper face side in each bank. 
• Crankshaft key: At cylinder head side of right bank. 

Fig 2: Identifying Camshaft Dowel Pin Hole Position

Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 3: Identifying Stopper Pin

Courtesy of NISSAN MOTOR CO., U.S.A.

1. Push plunger of timing chain tensioner (secondary) and keep it pressed in with stopper pin.
   • Use stopper pin included with Tool J-50246.
2. 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.
Fig 4: Identifying Dislocation Of Mating Marks
Courtesy of NISSAN MOTOR CO., U.S.A.
3. 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) (yellow 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).
     NOTE: 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.

     • Right bank : Use circle type (7) and (10). 
     • Left bank : Use oval type (4) and (5). 
   • 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.
     Fig 5: Aligning Marks On Timing Chain And Intake And Exhaust Sprockets

     Courtesy of NISSAN MOTOR CO., U.S.A.
4. Confirm the mating marks are aligned, then finger tighten camshaft sprocket bolts. Final tightening will be done with all timing chains installed.
5. Remove stopper pins out from timing chain tensioners (secondary).

• Make sure the mating marks on the crankshaft sprocket face the front of the engine.

Fig 6: Identifying Crankshaft Sprocket

Courtesy of NISSAN MOTOR CO., U.S.A.

• Water pump (G).
• Install timing chain (primary) so the mating mark (punched) (B) on camshaft sprocket (C) is aligned with the copper link (A) on the timing chain, while the mating mark (notched) (E) on the crankshaft sprocket (D) is aligned with the yellow one (F) on the timing chain, as shown.
• When it is difficult to align mating marks of the timing chain (primary) with each sprocket, gradually turn the camshaft to align it with the mating marks.
• During alignment, be careful to prevent dislocation of mating mark alignments of the secondary timing chains.

Fig 7: Identifying Primary Timing Chain

Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 8: Identifying Internal Chain Guide, Timing Chain Tensioner And Slack Guide

Courtesy of NISSAN MOTOR CO., U.S.A.

• If removed, reinstall slack guide.
  CAUTION: Do not overtighten slack guide bolts. It is normal for a gap to exist under the bolt seats when bolts are tightened to specification.
Fig 9: Identifying Slack Guide Bolt & Gap
Courtesy of NISSAN MOTOR CO., U.S.A.
• Remove stopper pin from timing chain tensioner (primary).

Tool number: (J-50288)