1987 MAZDA 626 Workshop Manual

1 B ON-VEHICLE MAINTENANCE (TIMING BELT)
3. Install the timing belt tensioner and spring. Tem-
porarily secure it with the spring fully extended.
Caution
Do not damage the pulleys when securing the
tensioner pulley.
76G01B-024
4. Install the timing belt so that there is no looseness
at the tension side, and at the two camshaft pulleys.
Caution
a) If the timing belt is being reused, it must be
reinstalled to rotate in the original direction.
b) Check that there is no oil, grease, or dirt on
the timing belt.
76G01B-025
5. Loosen the tensioner lock bolt.
6. Turn the crankshaft twice in the direction of rota-
tion, and align the mating marks.
7. Check that the timing marks are correctly aligned.
If not aligned, remove the timing belt tensioner and
timing belt, and repeat steps 1—6.
69G01B-027
8. Turn the crankshaft to align the "S" mark of the
right side camshaft pulley with seal plate mating
mark.
Tighten the timing belt tensioner lock bolt.
Tightening torque:
37—52 Nm (3.8—5.3 m-kg, 27—38 ft-lb)
76G01B-026
1B—14

ON-VEHICLE MAINTENANCE (TIMING BELT) 1 B
10. Check the timing belt deflection. If the deflection
is not correct, repeat the adjustment from step 5
above.
Timing belt deflection: 7.5—8.5 mm
(0.30—0.33 in) /98 N (10 kg, 22 lb)
Caution
Be sure not to apply tension other than that
of the tensioner spring.
76G01B-027
Drive belt
Install each drive belt, and check the belt deflection.
(Refer to page 1B—6.)
76G01B-028
Spark plug
1. Apply anti-seize compound or molybdenum-based
lubricant to the spark plug threads.
2. Install the spark plugs.
Tightening torque:
15—23
N
m (1.5—2.3 m-kg, 11—17 ft-lb)
79G01C-021
Steps After Installation
Perform the necessary engine adjustment. (Refer to
TUNE-UP PROCEDURE.)
86U01X-029
1B—15

1 B ON-VEHICLE MAINTENANCE (CYLINDER HEAD)
CYLINDER HEAD
Removal
Warning: Release the fuel pressure. (Refer to Section 4C.)
1. Disconnect the negative battery cable.
2. Drain the engine coolant.
3. Remove in the sequence shown in the figure referring to the removal note for specially marked parts.
1B—16

76G01B-034

1 B ON-VEHICLE MAINTENANCE (CYLINDER HEAD)
1. Center cover
2. High-tension lead and spark plug
3. Accelerator cable
4. Air intake pipe assembly
5. Fuel hose
6. Upper radiator hose
7. Heater hose
8. Brake vacuum hose
9. Canister hose (Unleaded fuel)
10. Engine harness connector and ground
11. EGR pipe (Unleaded fuel)
12. A/C compressor and bracket
13. Exhaust manifold insulator
14. Exhaust pipe
15. Exhaust manifold
16. Intake manifold bracket
17. Intake manifold assembly
18. Distributor
19. Engine mount stay
20. Upper timing belt cover
21. Timing belt tensioner spring
22. Timing belt
23. Cylinder head cover
24. Cylinder head and gasket
76G01B-030
Removal note
Fuel hose
Warning
a) Cover the hose with a rag because fuel will
spray out when disconnecting.
b) Keep sparks and open flame away from the
fuel area.
Plug the disconnected hoses to avoid fuel leakage.
86U01X-032
Timing belt
1. Before removing the timing belt, turn the crankshaft
to 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.
76G01B-031
2. Loosen the timing belt tensioner lock bolt.
3. Shift the tensioner outward as far as possible, then
temporarily tighten it.

76G01B-034

1B—17

1 B ON-VEHICLE MAINTENANCE (CYLINDER HEAD)
69G01B-037
CP ® (9) (I)
maj
q Jo o ph£j
@ ® (D
76G01A-111
4. Remove the timing belt and secure it out of the way
to prevent damage during removal and installation
of the cylinder head.
Cylinder head bolt
Loosen the cylinder head bolts in two or three steps
in the order shown in the figure.
Disassembly of Cylinder Head
Refer to page 1B—28.
Inspection of Cylinder Head
Refer to page 1B—34.
Assembly of Cylinder Head
Refer to page 1B—59.
76G01B-032
1B—18

1 B ON-VEHICLE MAINTENANCE (CYLINDER HEAD)
Installation
Install in the reverse order of removal referring to the installation note.
Note a) Position the hose clamp in the original location on the hose.
b) Squeeze the clamp lightly with large pliers to ensure a good fit.
Torque Specifications
8—12 N-m (80—120 cm-kg, 69—104
4—6 N-m (40—60 cm-kg, 35—52 in
15—23 N-m (1.5—2.3 m-kg, 11—17 ft-lb)
7—10 N-m (70—100 cm-kg, 61—87 In-lb)
—11 N-m (80—110 cm-kg, 69—95 In-lb)
37—52 N-m (3.8—5.3 m-kg. 27—38 ft-lb)
80—86 N-m (8.2—8.8 m-kj, 59—64 ft-lb)
~t/—- -19—30 N-m (1.9—3.1 m-kg, g^ 14-22 ft-lb)

\34—44
N-m (3.5—4.5 m-kg, ' 25—33 ft-lb)
19-30 N-m (1.9—3.1 m-kg, 14—22 ft-lb)
19—30 N-m (1.9—3.1 m-kg, 14—22 ft-lb)
37—52 N-m (3.8—5.3 m-kg, 27—38 ft-lb)
76G01A-112
1B—19

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)
76G01B-033
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.)
76G01B-034
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.
76G01A-035
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.)
86U01X-041
1B-21