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 points straight up.
   Fig 1: Positioning Cams For Valve Clearance Adjustment

   Courtesy of MAZDA MOTORS CORP.
2. Remove the camshaft cap bolts where necessary.
   • RH exhaust side adjustment shim removal: A
   • RH intake side adjustment shim removal: B
   • LH intake side adjustment shim removal: C
   • LH exhaust side adjustment shim removal: D
   Fig 2: Removing Camshaft Cap Bolts

   Courtesy of MAZDA MOTORS CORP.
3. Install the SSTs  as shown in Fig 3.

   Tightening torque

   11.3-14.2 N.m {115-145 kgf.cm, 97-124 in.lbf} 

   Fig 3: Installing SST's

   Courtesy of MAZDA MOTORS CORP.
4. Align the marks on the SSTs  (shaft and shaft clamp).
   Fig 4: Aligning Marks On The SST

   Courtesy of MAZDA MOTORS CORP.
5. Face the SST  (body) toward the center of the cylinder head, and mount it on the camshaft using the camshaft cap bolt holes.
6. Tighten bolts A to secure the SST  (shaft).
   Fig 5: Securing SST Shaft

   Courtesy of MAZDA MOTORS CORP.
7. Position the notch of the tappet so that a small screwdriver can be inserted.
8. Set the SST  on the tappet by its notch.
9. Tighten bolt B to secure the SST  (body).
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. If the adjustment shim is not removed easily, install a washer (3 mm {0.12 in})  under the SST  (49 T012 003).
    Fig 7: Removing Adjustment Shim

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

    New adjustment shim

    = Removed Shim Thickness + Measured Valve Clearance - Standard Valve Clearance (0.28 mm {0.011 in} (IN), 0.30 mm {0.012 in} (EX)) 

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, 97-124 in.lbf} 

17. Verify the valve clearance.

    Standard [Engine Cold]

    IN: 0.245-0.315 mm {0.0097-0.0124 in} 

    EX: 0.265-0.335 mm {0.0105-0.0131 in}