1987 MAZDA 626 oil

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

INSPECTION AND REPAIR 1 A
mjjm
H D f IT~inr
86U01X-095
5. Measure the oil clearance of the camshaft and
camshaft caps.
(1) Remove any oil, or dirt from the journals and
bearing surface.
(2) Set the camshaft onto the cylinder head.
(3) Position plasti-gauge on top of the journals in
the axial direction.
(4) Place the camshaft caps and rocker arm shafts
in position, and tighten them to the specified
torque.
Tightening torque:
18—26
N
m (1.8—2.7 m-kg, 13—20 ft-lb)
(5) Remove the camshaft caps and measure the
oil clearance at each cap.
Oil clearance
Front and rear:
0.035—0.085 mm (0.0014—0.0033 in)
Center three journals:
0.065—0.115 mm (0.0026—0.0045 in)
Maximum: 0.15 mm (0.0059 in)
(6) If the oil clearance exceeds the maximum, re-
place the cylinder head.
86U01X-096
6. Measure the camshaft end play. If it exceeds the
maximum, replace the camshaft and/or the cylin-
der head.
End play:
0.08—0.16 mm (0.003—0.006 in)
Maximum: 0.20 mm (0.008 in)
86U01X-097

76G01A-131

1A—54
Rocker Arm and Rocker Arm Shaft
1. Check for wear or damage to the contact surface
of the rocker arm shaft and the rocker arm. Re-
place if necessary.
2. Check the oil clearance between the rocker arm
and shaft. Replace if necessary.
(1) Measure the rocker arm inner diameter.
Diameter:
19.000—19.033 mm (0.7480—0.7493 in)
...12-valve
16.000—16.027 mm (0.6299—0.6310 in)
... 8-valve

INSPECTION AND REPAIR 1 A
76G01A-065
76G01A-066
86U01X-100
(2) Measure the rocker arm shaft diameter.
Diameter:
18.959—18.980 mm (0.7464—0.7472 in)
...12 valve
15.966—15.984 mm (0.6286—0.6293 in)
... 8 valve
(3) Subtract the shaft diameter from the rocker arm
diameter.
Oil clearance mm (in)
Standard Maximum
12-valve 0.020-0.074
(0.0008-0.0029) 0.10 (0.0039)
8-valve 0.016-0.061 (0.0006-0.0024) 0.10 (0.0039)
Hydraulic Lash Adjuster (12-valve)
Check the HLA face for wear or damage. Replace
if necessary.
Caution
Do not remove the HLA unless necessary to
prevent damaging the O-ring.
Cylinder Block
1. Check the cylinder block. Repair or replace if
necessary.
(1) Leakage damage
(2) Cracks
(3) Scoring of wall
2. Measure the distortion of the top surface of the cyl-
inder block in the six directions as shown in the
figure.
Distortion: 0.15 mm (0.006 in) max.
3. If the distortion exceeds the maximum, repair by
grinding, or replace the cylinder block.
Grinding limit: 0.20 mm (0.008 in) max.

86U01X-117

1A—55