Mazda engine L8, LF, L3. Manual - part 9

 

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Mazda engine L8, LF, L3. Manual - part 9

 

 

B–16

ENGINE 

2. Measure the out-of-square of the valve spring, 

using a square, as shown.
(1) Rotate the valve spring one full turn and 

measure "A" at the point where the gap is the 
largest.

If not as specified, replace the valve 
spring.

Valve spring maximum out-of-square:

1% (2.10 mm {0.0826 in})

End Of Sie

CAMSHAFT INSPECTION

A6E242412420E01

1. Set the No.1 and No.5 journals on V-blocks. 
2. Measure the camshaft runout.

If not as specified, replace the camshaft.

Maximum runout:

0.03 mm {0.0012 in}

3. Measure the cam lobe height at the two points as 

shown. 

If not as specified, replace the camshaft.

Standard height (mm) {in}

Minimum height (mm) {in}

AME2224E309

AME2224E082

AME2224E343

Camshaft

L8

LF, L3

L3 (with 
variable 

valve timing 
mechanism)

INT

40.79 {1.606}

42.12 {1.659}

42.44 {1.671}

EXH

41.08 {1.618}

41.08 {1.618}

41.18 {1.622}

Camshaft

L8

LF, L3

L3 (with 
variable 

valve timing 
mechanism)

INT

40.692 

{1.603}

42.022

{1.655}

42.342 

{1.667}

EXH

40.982 

{1.614}

40.982 

{1.614}

41.082 

{1.618}

ENGINE 

B–17

B

4. Measure the journal diameters in X and Y 

directions at the two points (A and B) as indicated 
in the figure.

If not as specified, replace the camshaft.

Standard diameter:

 24.96—24.98 mm {0.9827—0.9834 in}

Minimum diameter:

24.95 mm {0.982 in}

5. Remove the tappet.
6. Position plasticgage atop the journals in the axial 

direction.

7. IInstall the camshaft cap. (See 

B–40 Camshaft Assembly Note

.)

8. Remove the camshaft cap. (See 

B–6 Camshaft Cap Disassembly Note

.)

9. Measure the oil clearance. 

If not as specified, replace the cylinder head.

Standard clearance:

0.04—0.08 mm {0.002—0.003 in}

Maximum clearance:

0.09 mm {0.0035 in}

10. Install the camshaft cap. (See 

B–40 Camshaft 

Assembly Note

)

11. Measure the camshaft end play.

If not as specified, replace the cylinder head 
or camshaft.

Standard end play:

0.09—0.24 mm {0.0035—0.0094 in}

Maximum end play:

0.25 mm {0.0099 in}

12. Remove the camshaft cap. (See 

B–6 Camshaft 

Cap Disassembly Note

.)

End Of Sie

AME2224E344

AME2224E307

AME2224E025

B–18

ENGINE 

TAPPET INSPECTION

A6E242412310E01

1. Measure the tappet hole inner diameter in X and 

Y directions at the two points (A and B) shown.

Inner diameter:

31.000—31.030 mm {1.2205—1.2216 in}

2. Measure the tappet body outer diameter in X and 

Y directions at the two points (A and B) shown. 

Outer diameter:

30.970—30.980 mm {1.2193—1.2196 in}

3. Subtract the tappet body outer diameter from the 

tappet hole inner diameter.

If not as specified, replace the tappet or 
cylinder head.

Clearance

Standard: 
0.02—0.06 mm {0.0008—0.0023 in}

Maximum:

0.15 mm {0.006 in}

End Of Sie

CYLINDER BLOCK INSPECTION

A6E242410300E01

1. Measure the distortion of the cylinder block top 

surface in the six directions as indicated in the 
figure. 

If the distortion exceeds the maximum, 
replace the cylinder block.

Maximum cylinder block distortion:

0.10 mm  {0.004 in}

2. Measure the cylinder bores in X and Y directions 

at 42 mm {1.65 in} below the top surface.

If the cylinder bore exceeds the wear limit, 
replace the cylinder block. 

Standard diameter limit

L8: 

83.000—83.030 mm {3.2677—3.2689 in}

LF, L3, L3 (with variable valve timing 

mechanism):

87.500—87.530 mm {3.4449—3.4460 in}

Minimum / maximum bore diameter limit

L8: 

82.940—83.090 mm {3.2653—3.2712 in}

LF, L3, L3 (with variable valve timing mechanism):

87.440—87.590 mm {3.4425—3.4484 in}

AME2224E319

AME2224E320

AME2224E089

AME2224E090

ENGINE 

B–19

B

End Of Sie

OIL JET VALVE INSPECTION

A6E242410730E02

1. Apply compressed air to oil jet valve A and verify 

that air passes through oil jet valve B.

If not ventilation,replace the oil jet valve.

Air pressure:

216—274 kPa {2.2—2.7kgf•cm

2

 31.4—39.7 

psi} 

End Of Sie

PISTON INSPECTION

A6E242411010E01

Caution

••••

The piston, piston ring and connecting rod cannot be disassembled.

••••

When replacing the piston, piston pin, piston ring and connecting rod, replace them together as a 
single unit.

1. Measure the outer diameter of each piston at right 

angle 90

°

 to the piston pin, 10.0 mm {0.40 in} 

above the under of the piston.

If the piston diameter is below the standard 
diameter, replace the piston, piston pin, piston 
ring and connecting rod as a single unit.

Piston diameter

L8: 

82.965—82.995 mm {3.2664—3.2675 in}

LF, L3, L3 (with variable valve timing 

mechanism):

87.465—87.495 mm {3.4435—3.4446 in}

2. Measure the piston-to-cylinder clearance.

If not as specified, replace the piston, piston pin, piston ring and connecting rod as a single unit.

Standard clearance:

0.025—0.045 mm {0.0010—0.0017 in}

Maximum clearance:

0.11 mm {0.0043 in}

3. Measure the piston ring-to-ring groove clearance 

around the entire circumference.

If the piston ring-to-ring groove clearance 
exceeds the maximum clearance, replace the 
piston, piston pin, piston ring and connecting 
rod as a single unit.

Standard clearance:

Top: 0.03—0.08 mm {0.0012—0.0031 in}
Second: 0.03—0.07 mm {0.0012—0.0027in}
Oil: 0.03—0.07 mm {0.0012—0.0027 in}

Maximum clearance:

Top: 0.17 mm {0.0067 in}
Second, Oil: 0.15 mm {0.0059 in}

AME2224E105

AME2224E030

AME2224E029

 

 

 

 

 

 

 

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