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 camshaft requiring valve clearance adjustment are positioned straight up.
2. Remove the camshaft cap bolts where necessary. Remove only one pair of cap bolts at a time. Install the cap bolts before removing the next pair.
   • EX side No.1, 2,3 cylinder adjustment shim removal: A
   • IN side No.1, 2, 3 cylinder adjustment shim removal: B
   • EX side No.2, 3, 4 cylinder adjustment shim removal: C
   • IN side No.2, 3, 4 cylinder adjustment shim removal: D
     Fig 1: Removing Camshaft Cap Bolts

     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 

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

   Fig 2: Installing SST's

   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 3: Securing SST To The Shaft

   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 4: Verifying Correct SST Positioning

   Courtesy of MAZDA MOTORS CORP.
7. Face the notch of the tappet so that a small screwdriver can be inserted.
   Fig 5: Positioning Tappet

   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.
10. Tighten bolt C, and press down the tappet.
    Fig 6: Depressing Tappet

    Courtesy of MAZDA MOTORS CORP.
11. Using a fine screwdriver, pry up the adjustment shim through the notch on the tappet. Remove the shim using a magnet.
    Fig 7: Removing Shim

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

    New Adjustment Shim 

    = Removed Shim Thickness + Measured 

    Valve Clearance - Standard Valve Clearance (0.26 mm {0.010 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 

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

17. Verify the valve clearance. See VALVE CLEARANCE INSPECTION .