1987 MAZDA 626 torque

ON-VEHICLE MAINTENANCE (VALVE SEAL) 1 C
Installation
Install in the reverse order of removal referring to the installation note.
Torque Specifications
20—26 N-m (2.0—2.7 m-kg, 14—20 ft-lb)
N-m (5.6—6.6 m-kg, ft-lb)
55—65 N m (5.6—6.6 m-kg, 41—48 ft-lb)
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Installation note
Valve seal
1. Apply engine oil to the inside of the new valve seal.
2. Push it on gently with the SST.
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1C—27

ON-VEHICLE MAINTENANCE (VALVE SEAL) 1 C
4. Set the camshaft and camshaft cap so that the key
groove faces directly upward.
And tighten the cap nuts loosely.
5. Apply a coat of engine oil to the new oil seal lip
and insert it.
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6. Tighten the camshaft cap nuts gradually and in the
order shown in the figure.
Tightening torque:
20—26 N-m (2.0—2.7 m-kg, 14—20 ft-lb)
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Camshaft pulley and rear camshaft pulley
Hold the camshaft with a wrench (29 mm, 1.14 in),
tighten the camshaft pulley and rear camshaft pul-
ley lock bolts.
Tightening torque:
55—65 N-m (5.6—6.6 m-kg, 41—48 ft-lb)
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1 C ON-VEHICLE MAINTENANCE (VALVE SEAL)
2. Check that the timing marks of the camshaft pul-
ley and the injection pump pulley align with the tim-
ing marks on the seal plate.
3. Install the timing belt. (Refer to TIMING BELT of
ON-VEHICLE MAINTENANCE)
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Valve clearance
Measure the valve clearance, and adjust if necessary.
(Refer to page 1C—85).
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Gasket
Head cover App|y sealant
Cylinder head cover
1. Remove the rag pluged oil return hole.
2. Apply sealant to the shaded areas as shown in the
figure.
3. Install the cylinder head cover.
Tightening torque:
7—10 Nm (70—100 cm-kg, 61—87 in-lb)
4. Perform the necessary engine adjustments by
referring to TUNE-UP PROCEDURE section.
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1C-30

1 C DISASSEMBLY (CYLINDER BLOCK)
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.
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2. Remove the snap rings from the piston.
3. Remove the piston pin with the SST.
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Main bearing cap
During disassembly, clean the bearings, main jour-
nals, and caps, and measure the following:
1. Crankshaft end play. (Refer to page 1C—65.)
2. Main journal oil clearance. (Refer to page 1C—64.)
Pilot bearing
Remove the pilot bearing from the crankshaft with the
SST.
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INSPECTION AND REPAIR 1C
n a. n _ n
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5. Measure the oil clearance of the camshaft.
(1) Remove the tappets and adjusting discs from
the cylinder head, and separate them by
cylinder.
(2) Clean the camshaft and cylinder head journal.
(3) Install the camshaft into position.
(4) Set a Plasti-gauge on the camshaft journal in
the axial direction.
(5) Install the camshaft caps according to the num-
ber and arrow marks.
(6) Tighten the camshaft caps evenly and in ord-
er shown in the figure.
Tighten torque:
20—26 Nm (2.0—2.7 m-kg, 14—20 ft-lb)
(7) Remove the camshaft caps and measure the
oil clearance.
Oil clearance:
0.025—0.066 mm (0.0010—0.0026 in)
Maximum: 0.10 mm (0.004 in)
(8) If the oil clearance exceeds the maximum,
replace the cylinder head or camshaft.

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1C-54

1 C 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
1C—62

1 C ASSEMBLY (CYLINDER BLOCK)
Crankshaft
1. Before installing the crankshaft, inspect the main
bearing oil clearances as described.
Oil clearance inspection
(1) Remove any foreign material and oil from the
journal and bearing.
(2) Install the upper main bearings in the cylinder
block.
(3) Set the crankshaft into the cylinder block.
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(4) Position the plasti-gauge on top of the journals
in the axial direction.
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(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
N
m (8.4—9.0 m-kg, 61—65 ft-lb)
Caution
Do not rotate the crankshaft when measuring
the oil clearances.
(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 1C—59.)
Oil clearance:
0.031—0.050 mm (0.0012—0.0020 in)
Maximum: 0.08 mm (0.0031 in)
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1C-64

1C ASSEMBLY (CYLINDER BLOCK)
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.
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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).
86U01X-128
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:
65—69 N-m (6.6—7.0 m-kg, 48—51 ft-lb)
Oil clearance:
0.027—0.055 mm (0.0011—0.0022 in)
Maximum: 0.08 mm (0.0031 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.
If the oil clearance exceeds the maximum, grind
the crankshaft and use undersize bearings. (Re-
fer to page 1C—60.)
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1C-66