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 as necessary.
   NOTE:

   • 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.
     • D: For IN side No. 2, 3, 4 cylinder adjustment shim removal.
   Fig 1: Identifying Intake And Exhaust Valves

   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.
   Fig 2: Installing SSTs On Camshaft

   Courtesy of MAZDA MOTORS CORP.

   Tightening torque 

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

   Fig 3: Identifying 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: Aligning Marks On SSTs (Shaft And Shaft Clamp)

   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: Facing SST (Body) Toward Outside Of Cylinder Head

   Courtesy of MAZDA MOTORS CORP.
7. Face the notch of the tappet so that a fine screwdriver can be inserted.
8. Set the SST  on the tappet by its notch.
   Fig 6: Setting SST On Tappet By Its Notch

   Courtesy of MAZDA MOTORS CORP.
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 7: Pressing Down 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.
12. Select proper adjustment shim.
    Fig 8: Prying Up Adjustment Shim Through Notch On Tappet

    Courtesy of MAZDA MOTORS CORP.

    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 .)