1987 MAZDA 626 Workshop Manual

DISASSEMBLY (CYLINDER HEAD) 1 A
Disassembly Note
Camshaft
Before removing the rocker arm and shaft assembly,
clean the bearings and journals, and measure the fol-
lowing points.
1. Camshaft end play. (Refer to page 1A—54.)
2. Camshaft journal oil clearance. (Refer to page

1
A—54.)
76G01A-049
O @ ® ® ®
2 CD 10 (7)
Rocker arm and shaft assembly
1. Loosen the bolts in two or three steps in the order
shown in the figure.
2. Remove the rocker arm and shaft assembly togeth-
er with the bolts.
Caution
a) Do not mix up the various parts of the rock-
er arm and shaft assembly.
b) Do not remove the HLA unless necessary.
86U01X-067
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Cylinder head bolt
Loosen the cylinder head bolts in two or three steps
in the order shown in the figure.
86U01X-068
49 0636 100A
Valve
Remove the valves from the cylinder head with the
SST.
86U01X-069
1A—41

1 A DISASSEMBLY (CYLINDER HEAD)
CYLINDER HEAD (8-valve)
76G01A-050
1 .Cylinder head cover
2.Front housing
3.Rear housing
4.Rocker arm and shaft assembly
5. Camshaft
6.Cylinder head bolt
7.Cylinder head
8.Cylinder head gasket
9. Valve keeper
10. Upper spring seat
11. Outer valve spring
12. Inner valve spring
13. Lower spring seat
14. Valve
15. Valve seal
1A—42

DISASSEMBLY (CYLINDER HEAD) 1 A
76G01A-049
76G01A-057
Disassembly Note
Camshaft
Before removing the rocker arm and shaft assembly,
clean the bearings and journals, and measure the fol-
lowing points.
1. Camshaft end play. (Refer to page 1A—54.)
2. Camshaft journal oil clearance. (Refer to page
1A—54.)
Rocker arm and shaft assembly
1. Loosen the bolts in two or three steps in the order
shown in the figure.
2. Remove the rocker arm and shaft assembly togeth-
er with the bolts.
Caution
Do not mix up the various parts of the rocker
arm and shaft assembly.
Cylinder head bolt
Loosen the cylinder head bolts in two or three steps
in the order shown in the figure.
86U01X-068
Valve
Remove the valves from the cylinder head with the
SST
86U01X-069
1A—43

1 A DISASSEMBLY (CYLINDER BLOCK)
CYLINDER BLOCK—I
1. Clutch cover (MTX), Backing plate (ATX)
2. Clutch disc (MTX), Drive plate (ATX)
3. Flywheel (MTX), Adaptor (ATX)
4. End plate
5. Oil pan
76G01A-051
6. Oil strainer
7. Stiffener (FE 8-valve...only ECE, 12-valve)
8. Rear cover
9. Water pump assembly
10. Oil pump assembly
1A—44

DISASSEMBLY (CYLINDER BLOCK) 1 A
76G01A-125
Disassembly Note
Clutch cover, flywheel (MTX) or drive plate (ATX)
Remove the clutch cover and flywheel (MTX), or drive
plate (ATX) with the SST.
Oil pan
1. Remove the oil pan mounting bolts.
2. Insert a scraper or a suitable tool between the oil
pan and the stiffener or the cylinder block to sep-
arate them.
3. Remove the oil pan.
Caution
Do not bend the oil pan when prying loose.
76G01A-052
1A—45

1 A DISASSEMBLY (CYLINDER BLOCK)
CYLINDER BLOCK—II
86U01X-073
6. Crankshaft
7. Pilot bearing (MTX)
8. Main bearing
9. Cylinder block
Disassembly Note
Connecting rod and cap
Before removing the connecting rod, clean the bear-
ing, connecting rod, and crankpin, and measure the
following points.
1. Connecting rod side clearance. (Refer to page
1A—67.)
2. Crankpin oil clearance.(Refer to page 1A—67.)
1. Connecting rod cap
2. Connecting rod bearing
3. Connecting rod and piston
4. Piston ring
5. Main bearing cap

1
A—46

DISASSEMBLY (CYLINDER BLOCK) 1 A
Main bearing cap
Before removing the main bearing caps, clean the
bearings, main journals, and caps, and measure the
following points.
1. Crankshaft end play. (Refer to page 1A—66.)
2. Main journal oil clearance. (Refer to page
1
A—65.)
76G01A-054
Pilot bearing (MTX)
Remove the pilot bearing from the crankshaft with the
SST.
86U01X-076
Piston and connecting rod
1. Before disassembling the piston and connecting
rod, check the oscillation torque as shown in the
figure.
If the large end does not drop by its own weight,
replace the piston or the piston pin.
79G01C-050
2. Remove the piston pin with the SST.
While removing the piston pin, check the pressure.
If it is lower than 5kN (500kg, 1,100 lb), replace
the piston pin or connecting rod.

76G01A-139

1A—47

INSPECTION AND REPAIR 1 A
INSPECTION AND REPAIR
1. Clean all parts, taking care to remove any gasket fragments, dirt, oil or grease, carbon, moisture
residue, or other foreign materials.
2. Inspect and repair must be performed in the order specified.
Caution
Be careful not to damage the joints or friction surfaces of aluminum alloy components (such
as the cylinder head or pistons).
86U01X-077
Cylinder Head
1. Inspect the cylinder head for damage, cracks, and
leakage of water or oil. Replace if necessary.
2. Measure the cylinder head distortion in the six
directions shown in the figure.
Distortion: 0.15 mm (0.006 in) max.
79G01C-106
If the cylinder head distortion exceeds specifica-
tion, grind the cylinder head surface.
If the cylinder head height is not within specifica-
tion, replace it.
Height:
91.95—92.05 mm (3.620—3.624 in)
Grinding limit: 0.20 mm (0.008 in) max.
Note
Before grinding the cylinder head, first check
the following. Replace if necessary.
• Sinking of valve seat
• Damage of manifold contact surface
• Camshaft oil clearance and end play
Measure the manifold contact surface distortion in
the six directions shown in the figure.
Distortion: 0.15 mm (0.006 in) max.
If distortion exceeds specification grind the surface
or replace the cylinder head.
79G01C-053
1A—48