1987 MAZDA 626 oil

1 B DISASSEMBLY (CYLINDER BLOCK)
CYLINDER BLOCK-I
76G01B-043
1. Clutch cover 6. Oil strainer
2. Clutch disc 7. Rear cover
3. Flywheel 8. Water pump assembly
4. End plate 9. Oil pump assembly
5. Oil pan 10. Oil jet
1B—30

DISASSEMBLY (CYLINDER BLOCK) 1 B
76G01B-044
Bolt hole
Oil pan • ,„
Cylinder block
76G01B-045
Disassembly Note
Clutch cover and flywheel
Remove the clutch cover and flywheel with the SST.
Oil pan
1. Remove the oil pan mounting bolts.
2. Install the bolt ©from the mounting bolt or 10 mm
(0.39 in) bolts in the specified bolt holes ©(both
sides).
3. Screw in the bolts gradually and alternately to re-
move the oil pan.
Caution
a) Do not pry the oil pan to prevent damaging
the contact surface.
b) Do not damage or scratch the contact sur-
face when removing the oil sealant.
4. Remove the oil pan.
1B—31

1 B DISASSEMBLY (CYLINDER BLOCK)
CYLINDER BLOCK-II
76G01B-046
1. Connecting rod cap
2. Connecting rod bearing
3. Connecting rod and piston
4. Clip
5. Piston pin
6. Piston ring
7. Main bearing cap
8. Crankshaft
9. Pilot bearing
10. Main bearing
11. Cylinder block
Disassembly Note
Connecting rod and cap
Before removing the connecting rod, clean the bear-
ing, connecting rod, and crank pin, and measure the
following points.
1. Connecting rod side clearance. (Refer to page
1B—53.)
2. Crankpin oil clearance. (Refer to page 1B—53.)
76G01B-047
1B—32

DISASSEMBLY (CYLINDER BLOCK) 1 B
76G01B-048
76G01B-049
79G01C-050
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 1B—52.)
2. Main journal oil clearance. (Refer to page 1B—51.)
Pilot bearing
Remove the pilot bearing from the crankshaft with the
SST
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.
2. Remove the piston pin with the SST.
76G01B-050

1 B—33

1 B INSPECTION AND REPAIR
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
79G01C-106
76G01B-051
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.
3. 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:
133.95—134.05 mm (5.274—5.278 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
4. Measure the manifold contact surface distortion in
the six directions shown in the figure.
Distortion: 0.15 mm (0.006 in) max.
5. If distortion exceeds specification grind the surface
or replace the cylinder head.
79G01C-053
1B-34

1 B INSPECTION AND REPAIR
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.
76G01B-060
(4) Place the camshaft caps according the cap
number and arrow, and tighten them in the or-
der shown in the figure.
Tightening torque:
18—26 N-m (1.8—2.7 m-kg, 13—20 ft-lb)
76G01B-061
(5) Loosen the camshaft cap bolts in the order
shown in the figure.
76G01B-062
(6) Measure the oil clearance at each cap.
Oil clearance:
0.035—0.085 mm (0.0014—0.0033 in)
Maximum: 0.15 mm (0.0059 in)
(7) If the oil clearance exceeds the maximum, re-
place the camshaft and/ or the cylinder head.
76G01B-063
1B—40

INSPECTION AND REPAIR 1 B
Oil ring
groove
18mm IJUv. (0.709 in)*"! ^
79G01C-073
r Clearance
76G01A-130
69G01A-125
HV JT
101
^^Piston ring
vAv n^-n
iXXi ^^Piston ring ^^Piston ring
Piston
1. Inspect the outer circumferences of all pistons for
seizure or scoring. Replace if necessary.
2. Measure the outer diameter of each piston at a right
angle (90°) to the piston pin, 18 mm (0.709 in)
below the oil ring land lower edge.
Piston diameter mm (in)
Size Diameter
Standard 85.944—85.964 (3.3836—3.3844)
0.25 (0.010) oversize 86.194-86.214 (3.3935-3.3942)
0.50 (0.020) oversize 86.444-86.464 (3.4033-3.4041)
3. Check the piston to cylinder clearance.
Clearance:
0.036—0.075 mm (0.0014—0.0030 in)
Maximum: 0.15 mm (0.0059 in)
4. If the clearance exceeds the maximum, replace the
piston or rebore the cylinders to fit oversize pistons.
Caution
If the piston is replaced, replace the piston
rings also.
Piston and Piston Ring
1. Measure the piston ring to ring land clearance
around the entire circumference using a new pis-
ton ring.
Clearance (Top and Second):
0.03—0.07 mm (0.001—0.003 in)
Maximum: 0.15 mm (0.006 in)
2. If the clearance exceeds the maximum, replace the
piston.
Inspect the piston rings for damage, abnormal
wear, or breakage. Replace if necessary.
Insert the piston ring into the cylinder by hand and
push it to the bottom of the ring travel in using the
piston.

86U01X-101

1B—43

1 B INSPECTION AND REPAIR
76G01B-065
%
-X
@H
C/ v M v M
76G01B-066
76G01B-067
5. Measure each piston ring end gap with a feeler
gauge. Replace if necessary.
End gap
Top : 0.20—0.35 mm (0.008—0.014 in)
Second: 0.15—0.30 mm (0.006—0.012 in)
Oil rail : 0.20—0.70 mm (0.008—0.028 in)
Maximum: 1.0 mm (0.039 in)
Piston and Piston Pin
1. Measure the piston pin hole diameter in X and Y
directions at four points.
Diameter:
21.988—21.998 mm (0.8657—0.8661 in)
2. Measure the piston pin diameter.
Diameter:
21.987—21.993 mm (0.8656—0.8659 in)
3. Determine the piston pin to piston clearance by
subtracting the two figures.
Clearance:
-0.005—0.011 mm (-0.0002—0.0004 in)
4. If the clearance exceeds the specification, replace
the piston and/or piston pin.
Connecting Rod
1. Measure the connecting rod small end bore.
Diameter: 22.003—22.014 mm (0.8663—0.8667 in)
2. Check the clearance between the small end bore
and piston pin.
Clearance:
0.010—0.027 mm (0.0004—0.0011 in)

76G01B-063

1B—44