1987 MAZDA 626 engine

ASSEMBLY (CYLINDER BLOCK) 1 B
Oil clearance inspection
(1) Remove any foreign material and oil from the
journals and bearings.
(2) Install the upper main bearings in the cylinder
block.
(3) Set the crankshaft into the cylinder block.
(4) Position the plasti-gauge on top of the journals
in the axial direction.
86U01X-122
(5) Install the main bearing caps along with the
lower main bearings according to the cap num-
ber and mark.
(6) Tighten the caps in two or three steps in the
order in the figure.
Tightening torque:
82—88 Nm (8.4—9.0 m-kg, 61—65 ft-lb)
Caution
Do not rotate the crankshaft when measuring
the oil clearances.
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(7) Remove the main bearing caps, and measure
the plasti-gauge at each journal at the widest
point for the smallest clearance, and at the nar-
rowest point for the largest clearance.
If the oil clearance exceeds specification, grind
the crankshaft and use undersize main bear-
ings. (Refer to page 1B—45.)
Oil clearance
No. 1, 2, 4, 5:
0.025—0.043 mm (0.0010—0.0017 in)
No. 3:
0.031—0.049 mm (0.0012—0.0019 in)
Maximum: 0.08 mm (0.0031 in)
Apply a liberal amount of engine oil to the main
bearings and main journals.
Install the crankshaft and the main bearing caps
according to the cap number and ^ mark.
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1 B ASSEMBLY (CYLINDER BLOCK)
76G01A-074
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4. Inspect the crankshaft end play.
End play:
0.08—0.18 mm (0.0031—0.0071 mm)
Maximum: 0.30 mm (0.012 in)
5. If the end play exceeds specification, grind the
crankshaft and use undersize center main bearing.
Center main bearing width
Standard:
27.94—27.99 mm (1.1000—1.1020 in)
0.25 mm (0.010 in) undersize:
28.04—28.09 mm (1.1040—1.1059 in)
0.50 mm (0.020 in) undersize:
28.12—28.17 mm (1.1071—1.1091 in)
0.75 mm (0.030 in) undersize:
28.20—28.25 mm (1.1102—1.1122 in)
Note
Wider thrust width is available only in under-
size center main bearing.
Pilot Bearing
1. Apply engine oil to the outer circumference of the
bearing.
2. Set a piece of pipe (outer diameter 30—34 mm,
1.18—1.34 in) against the outer race of the bear-
ing, then tap it evenly into the crankshaft.
3. Lubricate the bearing with grease.
Piston and Connecting Rod Assembly
1. Apply a liberal amount of clean engine oil to the
cylinder walls, piston, and rings.
2. Check the piston rings for the end gap alignment.
3. Insert each piston assembly into the cylinder block
with the F mark facing the front of the engine. Use
a piston installer tool (commercially available).
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ASSEMBLY (CYLINDER BLOCK) 1 B
Connecting Rod Cap
1. Check the connecting rod bearing clearances us-
ing the same procedure as used for the main bear-
ing oil clearance.
Connecting rod cap tightening torque:
69—73 Nm (7.0—7.4 m-kg, 51—54 ft-lb)
Oil clearance:
0.027—0.067 mm (0.0011—0.0026 in)
Maximum: 0.10 mm (0.0039 in)
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Caution
Align the alignment marks on the cap and on
the connecting rod when installing the con-
necting rod cap.
2. If the oil clearance exceeds specification grind the
crankshaft and use undersize bearings. (Refer to
page 1B—46.)
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3. Check the side clearance of each connecting rod
without the cap installed.
Side clearance:
0.110—0.262 mm (0.004—0.0103 in)
Maximum: 0.30 mm (0.012 in)
If the clearance exceeds the maximum, replace the
connecting rod.
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4. Apply a liberal amount of engine oil to the crank-
pin journal and connecting rod bearing.
5. Install the connecting rod cap with the alignment
marks aligned.
Tightening torque:
69—73 Nm (7.0—7.4 m-kg, 51—54 ft-lb)
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1B—53

1 B ASSEMBLY (CYLINDER BLOCK)
CYLINDER BLOCK—II
Torque Specifications
19—25 N m (1.9—2.6 m-kg, 14-19 ft-lb)
7—12 N'm (70—120 cm-kg, 61—104 in-lb)
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Rear Cover
1. Apply engine oil to the rear cover, oil seal and oil
seal lip.
2. Press the oil seal into the rear cover.
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1B—54

ASSEMBLY (CYLINDER BLOCK) 1 B
3. Install the rear cover and a new gasket.
Tightening torque:
8—12 N-m (80—120 cm-kg, 69—104 in-lb)
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4. Cut away the portion of the gasket that projects out
from the rear cover assembly toward the oil pan
side.
Caution
Do not scratch the rear cover assembly.
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End Plate
Install the end plate.
Tightening torque:
19—30 Nm (1.9—3.1 m-kg, 14—22 ft-lb)
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Oil Pump
1. Apply engine oil to a new oil pump oil seal and the
oil pump body.
2. Press the oil seal into the oil pump body.
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1 B ASSEMBLY (CYLINDER BLOCK)
3. Apply engine oil to the oil seal lip.
4. Remove any dirt or other material from the con-
tact surfaces.
5. Apply a continuos bead of silicon sealant to the
contact surface of the oil pump.
Caution
Do not allow any sealant to get into the oil
hole.
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6. Install a new O-ring into the pump body.
7. Install the oil pump.
Tightening torque

(A):
19—25
N
m
(1.9—2.6 m-kg, 14—19 ft-lb)
(§): 37—52
N
m
(3.8—5.3 m-kg, 27—38 ft-lb)
8. Remove any sealant which has been squeezed
out.
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Oil Jet
Install the oil jet as shown in the figure.
Tightening torque: 12—18 Nm
(1.2—1.8 m-kg, 104—156 in-lb)
Caution
The shapes of the No.1, 3 cylinders jet valves
and No.2, 4 jet valves are different.
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Oil Strainer
Install the oil strainer and a new gasket.
Tightening torque:
8—12 Nm (80—120 cm-kg, 69—104 in-lb)
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1B—56

ASSEMBLY (CYLINDER
BLOCK)
1 B
CYLINDER HEAD
Torque Specifications
18—26 N-m (1.8—2.7 m-kg, 13—20 ft-lb)
8—12 Nm (80—120 cm-kg, 69—104 in-lb)
4—6 Nm (40—60 cm-kg, 35—52 In-lb)
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49 G012 002
Valve Seal
1. Apply engine oil to the inside of the new valve seal.
2. Install the valve seal onto the valve guide with the
SST

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1 B ASSEMBLY (CYLINDER HEAD)
Valve spring
®>®
Cylinder head side
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Valve and Valve Spring
1. Install the lower spring seat.
2. Install the valve.
3. Install the valve springs and the upper spring seat.
Note
Install the outer and inner valve spring with
the closer pitch toward the cylinder head.
4. Compress the valve spring with the SST; then in-
stall the valve keepers.
5. Tap the end of the valve stem lightly two or three
times with a plastic hammer to confirm that the
keepers are all fully seated.
Hydraulic Lash Adjuster (HLA)
1. Apply engine oil to the sliding surface.
2. Install the HLA in the position from which they were
removed.
3. Check for free movement.
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1B—60