1987 MAZDA 626 maintenance

1 B ON-VEHICLE MAINTENANCE (CYLINDER HEAD)
Installation note
Cylinder head
1. Thoroughly remove all dirt and oil from the top of
the cylinder block with a rag.
2. Place a new cylinder head gasket in position.
86U01X-035
® © © (D ® 3. Set the cylinder head in place.
4. Apply engine oil to the bolt threads and seat faces.
5. Tighten the cylinder head bolts in two or three steps
in the order shown in the figure.
Tightening torque:
80—86
N
m (8.2—8.8 m-kg, 59—64 ft-lb)
86U01X-036
Cylinder head cover
1. Apply silicon sealant to the shaded area as shown
in the figure.
2. Install the cylinder head cover and gasket.
Tightening torque:
4—6 N-m (40—60 cm-kg, 35—52 in-lb)
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Timing belt
1. Align the mating marks of the camshaft pulleys with
the seal plate timing mark.
Note
For intake side camshaft pulley, align "I"
mark.
For exhaust side camshaft pulley, align "E"
mark.
2. Install the timing belt. (Refer to TIMING BELT of
ON-VEHICLE MAINTENANCE.)
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1B—20

ON-VEHICLE MAINTENANCE (CYLINDER HEAD) 1 B
Distributor
1. Apply engine oil to the O-ring, and position it on
the distributor.
2. Apply engine oil to the blade.
3. Install the distributor.
4. Loosely tighten the distributor mounting bolt.
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Engine harness connector
Install the engine harness connectors.
1. IG coil
2. Heat gauge unit
3. Speed sensor
4. P/S switch
5. Engine ground
6. Water tempera-
ture sensor
7. Water thermo
switch
8. Crank angle
sensor
9. Oxygen sensor
10. Linear solenoid
11. Solenoid valve
(idle speed
control)
12. Throttle position
sensor
13. Injection harness
76G01B-035
Steps After Installation
1. Fill the radiator with the specified amount and type
of coolant.
2. Perform the necessary engine adjustments. (Re-
fer to TUNE-UP PROCEDURE.)
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1B-21

ENGINE
(DIESEL)
OUTLINE 1C— 2
STRUCTURAL VIEW 1C— 2
SPECIFICATIONS 1C— 3
TROUBLESHOOTING GUIDE 1C— 3
TUNE-UP PROCEDURE 1C— 5
ON-VEHICLE INSPECTION 1C—10
COMPRESSION 1C—10
ON-VEHICLE MAINTENANCE 1C—11
TIMING BELT 1C—11
CYLINDER HEAD 1C—16
VALVE SEAL 1C—24
REMOVAL 1C—31
DISASSEMBLY 1C—34
AUXILIARY PARTS 1C—34
TIMING BELT 1C—36
INJECTION PUMP 1C—39
CYLINDER HEAD 1C—40
CYLINDER BLOCK 1C—43
INSPECTION AND REPAIR 1C—47
ASSEMBLY 1C—62
CYLINDER BLOCK 1C—62
CYLINDER HEAD 1C—73
INJECTION PUMP 1C—78
TIMING BELT 1C—81
AUXILIARY PARTS 1C—87
INSTALLATION 1C—91
TRANSAXLE ASSEMBLY 1C—91
ENGINE INSTALLATION 1C—92 76G01C-001

ON-VEHICLE MAINTENANCE (TIMING BELT) 1 C
ON-VEHICLE MAINTENANCE
TIMING BELT
Removal
1. Disconnect the nagative battery cable.
2. Remove in the sequence shown in the figure referring to the removal note for specially marked parts.
76G01C-019
1. Engine side cover
2. A/C and alternator drive belt
3. Crankshaft pulley
4. Left and right timing belt cover
5. Alternator idle pulley
6. Idler pulley
7. No.3 engine mount
8. Timing belt
9. Timing belt tensioner and spring
Note
Loosen the No.3 engine mount nuts and lower the engine to remove the crankshaft pulley.
1C-11

1 C ON-VEHICLE MAINTENANCE (TIMING BELT)
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Kww
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Removal note
Timing belt
1. Aligh the timing marks of each pulleys.
2. Affix the injection pump pulley to the bracket us-
ing two bolts (35—40 mm, 1.4—1.6 in).
Caution
a) Do not turn in the reverse direction of en-
gine revolution.
b) After removing the timing belt, do not ro-
tate the crankshaft pulley or camshaft
pulley.
3. Make the forward direction arrow on the timing belt.
Note
Direction arrow is to reassemble the timing
belt in the same direction.
4. Loosen the timing belt tensioner bolt.
5. Shift the tensioner outwards as far as possible, and
temporarily tighten it.
6. Suspend the engine with chain block on the front
engine hanger.
7. Remove the No.3 engine mount.
8. Remove the timing belt.
Caution
Do not allow any oil or grease on the timing
belt.
Inspection and Repair
Inspect the following parts. (Refer to page 1C—60,
61).
1. Timing belt
2. Timing belt tensioner and spring
3. Timing belt idler pulley
4. Timing belt pulley
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1C—12

ON-VEHICLE MAINTENANCE (TIMING BELT) 1 C
Installation
Install in the reverse order of removal referring to the installation note.
Torque Specifications
85—117 N-m (8.7—11.9 m-kg, 63—86 ft-lb)
67—93 N-m (6.8—9.5 m-kg, 49—69 ft-lb)
37—52 N-m (3.8—5.3 m-kg, 27—38 ft-lb)
7—10 Nm (70—100 cm-kg, 61—87 In-lb)
11 N-m (80—110 m-kg, 69—95 ft-lb)
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Installation note
Timing belt
1. Check that the timing marks of camshaft pulley,
timing belt pulley and injection pump pulley align
with the timing marks.

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1C-13

ON-VEHICLE MAINTENANCE (TIMING BELT) 1 C
2. Install the timing belt tensioner and spring.
3. Temporarily secure the tensioner with it shifted
outwards.
63G01D-330
4. Install the timing belt.
Caution
a) The timing belt must be reinstalled in the
same direction of previous rotation, if it is
to be reused.
b) Be sure that there is no oil, grease, or dirt
on the timing belt.
76G01C-024
Install the idler pulley.
Tightening torque:
37—52
N
m (3.8—5.3 m-kg, 27-38 ft-lb)
Remove the affixing bolts from the injection pulley.
76G01C-025
7. Loosen the tensioner lock bolt.
8. Turn the crankshaft twice in the direction of rota-
tion (clockwise).
Caution
Do not rotate reverse direction.
9. Check that each timing mark is correcty aligned.
If not aligned, remove the timing belt. Repeat step
1-8.

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1C-14

ON-VEHICLE MAINTENANCE (TIMING BELT) 1 C
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76G01C-028
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Checking
point
Idler pulley
Crankshaft pulley zQi A/C
Checking point compressor
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10. Tighten the timing belt tensioner lock bolt.
Tightening torque:
37—52
N
m (3.8—5.3 m-kg, 27—38 ft-lb)
11. Check the timing belt tension.
If the tension is not correct, loosen the tensioner
lock bolt and repeat step 7—10, or replace the ten-
sioner spring.
Deflection: 9.0—11.5 mm
(0.35—0.45 in) /98 N (10 kg, 22 lb)
Caution
Be sure not to apply tension other than that
of the tensioner spring.
No.3 engine mount
Install the No.3 engine mount.
Tightening torque:
Nut A: 85—117 N-m
(8.7—11.9 m-kg, 63—86 ft-lb)
Nut B: 67—93 N-m
(6.8—9.5 m-kg, 49—69 ft-lb)
Drive belt
Install each drive belt, and check the belt deflection.
(Refer to page 1C—7.)
Steps after installation
Perform the necessary engine adjustment. (Refer to
TUNE-UP PROCEDURE,)
1C-15