Mazda engine MZR–CD. Manual - part 8

B–12

ENGINE 

Oil Pan Upper Block Disassembly Note

1. Loosen the oil pan upper block bolts in two or 

three steps in the order shown.

2. Remove the oil pan upper block

Rear Cover Disassembly Note

1. Remove the oil seal using a screwdriver protected 

with a rag.

Oil Pump Disassembly Note

1. Remove the oil seal using a screwdriver protected 

with a rag.

End Of Sie

AME2524E078

AME2522E001

AME2520E001

ENGINE 

B–13

B

CYLINDER BLOCK (II) DISASSEMBLY

AME222402000106

1. Disassemble in the order indicated in the table.

2.

.

AME2524E035

1

Connecting rod cap
(See 

B–14 Connecting Rod Cap Disassembly Note

)

2

Connecting rod bearing

3

Connecting rod, piston
(See 

B–14 Connecting Rod, Piston Disassembly 

Note

)

4

Piston ring

5

Snap ring

6

Piston pin
(See 

B–14 Piston Pin Disassembly Note

)

7

Connecting rod

8

Piston

9

Main bearing cap
(See 

B–14 Main Bearing Cap Disassembly Note

)

10

Lower main bearing, thrust bearing

11

Crankshaft
(See 

B–14 Crankshaft Disassembly Note

)

12

Upper main bearing, thrust bearing

13

Oil jet

14

Cover

15

Cylinder block

B–14

ENGINE 

Connecting Rod Cap Disassembly Note

1. Inspect the connecting rod side clearance. 

(See 

B–25 CONNECTING ROD SIDE CLEARANCE INSPECTION

)

Connecting Rod, Piston Disassembly Note

1. Before disassembling the connecting rod and piston, remove the carbon on the cylinder wall.
2. Inspect the connecting rod oil clearance. 

(See 

B–24 CONNECTING ROD OIL CLEARANCE INSPECTION/REPAIR

)

Piston Pin Disassembly Note

1. Inspect the oscillation torque. 

(See 

B–25 PISTON AND CONNECTING ROD INSPECTION

)

2. Remove the piston pin using the SST.

Main Bearing Cap Disassembly Note

1. Inspect the crankshaft end play.

(See 

B–24 CRANKSHAFT END PLAY INSPECTION/REPAIR

)

2. Loosen the main bearing cap bolts in two or three 

steps in the order shown.

Crankshaft Disassembly Note

1. Inspect the crankshaft oil clearance.

(See 

B–23 CRANKSHAFT OIL CLEARANCE INSPECTION/REPAIR

)

End Of Sie

CYLINDER HEAD INSPECTION

AME222410100101

1. Carry out color contrast penetrate examination on the cylinder head surface. Replace the cylinder head if 

necessary.

2. Inspect for the following and repair or replace if necessary.

(1) Sunken valve seats
(2) Excessive camshaft oil clearance and end play

AME2524E034

AME2524E068

ENGINE 

B–15

B

3. Measure the cylinder head for distortion in the 

seven directions as shown.

Maximum distortion

X distortion: 0.01 mm {0.0004 in}
Y distortion: 0.04 mm {0.0016 in}

4. If the cylinder head distortion exceeds the 

maximum, replace the cylinder head. Do not 
attempt to repair the cylinder head by milling or 
grinding.

5. Measure the manifold contact surface distortion 

as shown.

Maximum distortion

0.06 mm {0.0024 in}

6. If the distortion exceeds the maximum, grind the 

surface or replace the cylinder head.

Maximum grinding

0.20 mm {0.008 in}

End Of Sie

VALVE, VALVE GUIDE INSPECTION

AME222412111101

1. Measure the valve head margin thickness of each 

valve. Replace the valve if necessary.

Minimum margin thickness

IN: 0.8 mm {0.0315 in}
EX: 1.0 mm {0.0394 in}

2. Measure the length of each valve. Replace the 

valve if necessary.

Standard length

IN: 115.01—115.51 mm {4.528—4.547 in}
EX: 114.35—114.85 mm {4.502—4.521 in}

Minimum length

IN: 114.785 mm {4.519 in}
EX: 114.125 mm {4.493 in}

AME2524E038

AME2524E039

AME2511E005

AMJ2224E071