Hydraulic Variable Valve Timing Actuator and Exhaust Camshaft Component Installation Note

1. Apply SAE 90 gear oil or equivalent, or engine oil to the positions shown in the figure.
   CAUTION:

   • Apply 0.05 ml {0.05 cc, 0.003 in3} or less of oil to area A in the figure.
   Fig 1: Applying SAE 90 Gear Oil To Exhaust Camshaft Components

   Courtesy of MAZDA MOTORS CORP.
2. Apply gear oil (SAE 90 or equivalent) or engine oil to the thrust surface (both surfaces front and back) of the front journal on the exhaust camshaft.
   NOTE:

   • If oil is applied to the front camshaft cap, oil should not be applied to the thrust surface of the front journal.
3. Remove the rope suspending the timing chain on the exhaust side.
4. While aligning the mark on the timing chain placed during removal with the one on the hydraulic variable valve timing actuator, place the exhaust camshaft component on the cylinder head.
   Fig 2: Placing Exhaust Camshaft Component On Cylinder Head

   Courtesy of MAZDA MOTORS CORP.
5. Apply SAE 90 gear oil or equivalent, or engine oil to the central area of each journal on the exhaust camshaft.
   Fig 3: Applying Engine Oil To Central Journal On Exhaust Camshaft

   Courtesy of MAZDA MOTORS CORP.
6. Apply SAE 90 gear oil or equivalent, or engine oil to the thrust surface of the front camshaft cap.
   NOTE:

   • If oil is applied to the front journal thrust surface of the exhaust camshaft, oil should not be applied to the front camshaft cap.
7. Apply sealant (Loctite #962T or equivalent) to the rear camshaft cap installation area on the exhaust side or the rear camshaft caps on the exhaust side of the cylinder head.
   NOTE:

   • To prevent engine oil leakage, apply sealant to the rear camshaft cap installation area on the exhaust side or the rear camshaft caps on the exhaust side of the cylinder head, and seal the journal.
   Fig 4: Applying Sealant To Rear Camshaft Cap Installation Area

   Courtesy of MAZDA MOTORS CORP.
   CAUTION:

   • Verify that there is no sealant agent on the journal.

   Sealant agent bead width 

   1-3 mm {0.04-0.11 in}

8. Install the camshaft caps in the marked number order, and temporarily tighten the camshaft cap installation bolts in two or three passes evenly.
9. Tighten the camshaft cap installation bolts in two steps in the order shown in the figure.

Fig 5: Camshaft Cap Installation Bolts Tightening Sequence

Courtesy of MAZDA MOTORS CORP.

Tightening torque 

First step: 3.0-6.0 N.m {31-61 kgf.cm, 27-53 in.lbf}

Second step: 8-11 N.m {82-112 kgf.cm, 71-97 in.lbf}