oil MAZDA 626 1987 Owners Manual

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

INSPECTION AND REPAIR 1 B
3. Check each connecting rod for bending or twist-
ing. Repair or replace if necessary.
Bend: 0.06 mm (0.0024 in) max.
Twist: 0.06 mm (0.0024 in) max.
86U01X-108
Crankshaft
1. Check the journals and pins for damage, scoring,
or oil hole clogging.
2. Set the crankshaft on V-blocks.
3. Check the crankshaft runout at the center journal.
Replace if necessary.
Runout: 0.03 mm (0.0012 in) max.
86U01X-109
4. Measure each journal diameter in X and Y direc-
tions at two points.
Main journal
Diameter:
59.937—59.955 mm (2.3597—2.3604 in)
Out-of-round: 0.05 mm (0.0020 in) max.
Crankpin journal
Diameter:
50.940—50.955 mm (2.0055—2.0061 in)
Out-of-round: 0.05 mm (0.0020 in) max.
76G01A-131
Crankpin
Main journal
5. If the diameter is less than the minimum, grind the
journals to match undersize bearings.
Undersize bearing: 0.25 mm (0.010 in),
0.50 mm (0.020 in), 0.75 mm (0.030 in)
Main journal diameter undersize mm (in)

69G01A-101

Bearing size Journal diameter
0.25
(0 010)
undersize
0.50 (0.020) undersize

No
1,2,4,5 59.693-59.711 (2.3501-2.3508) 0.25
(0 010)
undersize
0.50 (0.020) undersize
No 3 59.687-59.705 (2.3499-2.3506)
0.25
(0 010)
undersize
0.50 (0.020) undersize
No.1,2,4,5 59.443-59.461 (2.3403—2.3410)
0.25
(0 010)
undersize
0.50 (0.020) undersize No.3 59.437-59.455 (2.3400—2.3407)
0.75
(0 030)
undersize
NO.1,2,4,5 59.193-59.211 (2.3304-2.3311) 0.75
(0 030)
undersize No.3 59.187-59.205 (2.3302-2.3309)
1B—45

INSPECTION AND REPAIR 1 B
Rolled fillet
Crankpin journal diameter undersize mm (in)
Bearing size Journal diameter
0.25 (0.010) undersize 50.690-50.705 (1.9957—1.9963)
0.50 (0.020) undersize 50.440—50.455 (1.9858-1.9864)
0.75 (0.030) undersize 50.190-50.205 (1.9760-1.9766)
Caution
Do not grind the rolled fillet area.
76G01A-133
Main Bearing and Connecting Rod Bearing
Check the main bearings and the connecting rod
bearings for peeling, scoring, or other damage.
79G01C-077
Oil Jet
1. Check that the oil passage is not clogged.
2. Check that the check ball is not stuck.
76G01B-069
Timing Belt
1. Replace the timing belt if there is any oil or grease
on it.
2. Check the timing belt for damage, wear, peeling,
cracks, or hardening. Replace if necessary.
86U01X-101
1B—46

INSPECTION AND REPAIR 1 B
Caution
a) Never forcefully twist, turn inside out, or
bend the timing belt.
b) Be careful not to allow oil or grease on the
belt.
86U01X-114
Timing Belt Tensioner and Idler Pulley
Check the timing belt tensioner and idler pulley for
smooth rotation and abnormal noise. Replace if
necessary.
Caution
Do not clean the tensioner with cleaning
fluids. If necessary, use a soft rag to wipe it
clean, and avoid scratching it.
86U01X-115
Timing Belt Tensioner Spring
Check the free length of the tensioner spring. Replace
if necessary.
Free length: 53.3 mm (2.098 in)
76G01B-126
Timing Belt Pulley and Camshaft Pulley
Inspect the pulley teeth for wear, deformation, or other
damage. Replace if necessary.
Caution
Do not clean the pulley with cleaning fluids.
If necessary, use a rag to wipe it clean.
Timing Belt Cover (lower and upper)
Inspect the timing belt covers for damage or cracks.
Replace if necessary.
86U01X-101
1B—47

1 B ASSEMBLY (CYLINDER BLOCK)
ASSEMBLY
1. Clean all parts before reinstallation.
2. Apply new engine oil to all sliding and rotating parts.
3. Replace plain bearings if they are peeling, burned, or otherwise damaged.
4. Tighten all bolts and nuts to the specified torques.
Caution
Do not reuse gaskets or oil seals.
CYLINDER BLOCK—I
Torque Specifications
69G01A-139
1B—48