Mazda engine MZR–CD. Manual - part 12

B–28

ENGINE

VALVE CLEARANCE INSPECTION

AME222412111105

1. Remove the cylinder head cover.
2. Turn the crankshaft and align the timing marks so that the piston of the No.1 or No.4 cylinder is at TDC of

compression.

3. Measure the valve clearances A with the No.1

cylinder at TDC of compression, and those of B
with the No.4 cylinder at TDC of compression.

Standard valve clearance [Engine cold]

IN: 0.12—0.18 mm {0.0048—0.0070 in}

(0.15

±±±±

0.03 mm {0.0059

±±±±

0.0012 in})

EX: 0.32—0.38 mm {0.0126—0.0149 in}

(0.35

±±±±

0.03 mm {0.0138

±±±±

0.0012 in})

4. If the valve clearance is not within the

specification, adjust the valve clearance. (See

B–

28 VALVE CLEARANCE ADJUSTMENT

)

5. Turn the crankshaft one full turn and measure the

remaining valve clearances. Adjust the valve
clearance if necessary.

End Of Sie

VALVE CLEARANCE ADJUSTMENT

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1. Remove the injection nozzle bracket.
2. Remove the injection nozzle.

Caution

••••

When removing the injection nozzle bracket, always replace the injection nozzle washer. When
replacing the injection nozzle washer, wipe off any carbon adhering to the nozzle installation
surface of the cylinder head with a clean cloth before installing.

3. Turn the crankshaft clockwise and set the No.1

cylinder to compression TDC.

4. Adjust the valve clearance A with the No.1

cylinder at TDC of compression, and those of B
with the No.4 cylinder at TDC compression.
(1) Hold the rocker bridge using the SST (49

G012 006).

(2) Loosen the locknut (d) using the SST (49

G012 004), and then turn the adjusting screw
(c) using the SST (49 G012 005) until it is
separated from the valve stem completely.

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ENGINE

B–29

(3) Loosen the rocker arm locknut (b) using the

SST (49 G012 004), and then turn the
adjusting screw (a) using the SST (49 G012
005) until it is separated from the rocker
bridge completely.

(4) Insert a feeler gauge between the rocker arm

and rocker bridge (e).

Standard valve clearance [Engine cold]

IN: 0.12—0.18 mm {0.0048—0.0070 in}

(0.15

±±±±

0.03 mm {0.0059

±±±±

0.0012 in})

EX: 0.32—0.38 mm {0.0126—0.0149 in}

(0.35

±±±±

0.03 mm {0.0138

±±±±

0.0012 in})

(5) Adjust the valve clearance by turning the

adjuster (a) using the SST (49 G012 005).
Then temporarily tighten locknut (b) using the
SST (49 G012 004).

(6) With the feeler gauge inserted between the

rocker arm end rocker bridge, verify that the
feeler gauge remains firmly in place even
when the adjusting screw (c) is loosened. If
the feeler gauge does not remain firmly in
place, repeat procedures from Step 1.

(7) Turn the adjusting screw (c) using the SST

(49 G012 005) until it reaches the valve stem
and the feeler gauge fits more firmly.
Then tighten the locknut (d) using the SST (49
G012 004) to specified torque.

Tightening torque

16—20 N·m {1.6—2.1 kgf·cm, 12—15 in·lbf}

(8) Loosen the locknut (b) using the SST (49 G012 004) and readjust the valve clearance (e).

Standard valve clearance [Engine cold]

IN: 0.12—0.18 mm {0.0048—0.0070 in} (0.15

±±±±

0.03 mm {0.0059

±±±±

0.0012 in})

EX: 0.32—0.38 mm {0.0126—0.0149 in} (0.35

±±±±

0.03 mm {0.0138

±±±±

0.0012 in})

(9) Tighten the locknut (b) using the SST (49 G012 004) to specified torque.

Tightening torque

16—20 N·m {1.6—2.1 kgf·cm, 12—15 in·lbf}

(10)Verify the valve clearance at (e).

Standard valve clearance [Engine cold]

IN: 0.12—0.18 mm {0.0048—0.0070 in} (0.15

±±±±

0.03 mm {0.0059

±±±±

0.0012 in})

EX: 0.32—0.38 mm {0.0126—0.0149 in} (0.35

±±±±

0.03 mm {0.0138

±±±±

0.0012 in})

5. Turn the crankshaft one full turn and adjust the remaining valve clearances.
6. Install the injection nozzle.
7. Install the injection nozzle bracket.

(See

B–41 Injection Nozzle Assembly Note

)

End Of Sie

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