Valve Clearance Adjustment

Perform this same procedure for all camshafts requiring valve clearance adjustment.

1. Turn the crankshaft clockwise so that the cams on the camshafts requiring valve clearance adjustment are positioned straight up.
2. Remove the camshaft cap bolts as necessary.

   Remove only one pair of cap bolts at a time.

   Reinstall the cap bolts before removing the next pair.

   A: For EX side No. 1, 2, 3 cylinder adjustment shim removal.

   B: For IN side No. 1, 2, 3 cylinder adjustment shim removal.

   C: For EX side No. 2, 3, 4 cylinder adjustment shim removal.

   C: For IN side No. 2, 3, 4 cylinder adjustment shim removal.

   Fig 1: Valve Adjustment Identification

   Courtesy of MAZDA MOTORS CORP.
   NOTE:

   • For EX side No.2, 3 cylinder adjustment shim removal, remove bolts either A or C.
   • For IN side No.2, 3 cylinder adjustment shim removal, remove bolts either B or D.
3. Install the SSTs  on the camshaft using the camshaft cap bolt holes.

   Tightening Torque 

   1. 11.3-14.2 N.m {115-145 kgf.cm, 100-125 in.lbf} 
      Fig 2: Installing Camshaft SSTs

      Courtesy of MAZDA MOTORS CORP.
      Fig 3: Installing Camshaft SSTs

      Courtesy of MAZDA MOTORS CORP.

4. Align the marks on the SSTs  (shaft and shaft clamp).
5. Tighten bolts A to secure the SST  (shaft).
   Fig 4: Identifying SST Bolt A

   Courtesy of MAZDA MOTORS CORP.
6. Face the SST  (body) outside of the cylinder head, and mount it on the SST  (shaft) at the point of the adjustment shim to be replaced.
   Fig 5: Mounting SST

   Courtesy of MAZDA MOTORS CORP.
7. Face the notch of the tappet so that a fine screwdriver can be installed.
   Fig 6: Identifying Tappet Notch

   Courtesy of MAZDA MOTORS CORP.
8. Set the SST  on the tappet by its notch.
9. Tighten bolt B to secure the SST  (body).
CAUTION:
• Cylinder head can be damaged when the tappet is pressed down.
Fig 7: Identifying SST Bolts
Courtesy of MAZDA MOTORS CORP.
10. Tighten bolt C, and press down the tappet.
11. Using a fine screwdriver, pry up the adjustment shim through the notch on the tappet. Remove the shim by using a magnet.
    Fig 8: Prying Up Adjustment Shim

    Courtesy of MAZDA MOTORS CORP.
12. Select proper adjustment shim.

    New Adjustment Shim 

    1. = Removed Shim Thickness + Measured Valve Clearance - Standard Valve Clearance (IN: 0.21 mm {0.0111 in}, EX: 0.31 mm {0.0122 in}) 
13. Push the selected shim into the tappet.
14. Loosen bolt C to allow the tappet to move up.
15. Loosen bolt B and remove the SST  (body).
16. Remove the SSTs  and tighten the camshaft cap bolts.

    Tightening Torque 

    1. 11.3-14.2 N.m {115-145 kgf.cm, 100-125 in.lbf} 

17. Inspect for the valve clearance. (Refer to VALVE CLEARANCE ADJUSTMENT  , VALVE CLEARANCE INSPECTION  .)