1987 MAZDA 626 timing belt

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
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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 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

1 B DISASSEMBLY (TIMING BELT)
TIMING BELT
69G01B-072
1. Crankshaft pulley 6. Timing belt idler pulley
2. Upper timing belt cover 7. Timing belt
3. Lower timing belt cover 8. Camshaft pulley
4. Baffle plate 9. Timing belt pulley
5. Timing belt tensioner and spring
1B—26

DISASSEMBLY (TIMING BELT) 1 B
Mark the
direction of
rotation
76G01A-121
76G01B-119
Disassembly Note
Crankshaft pulley
1. Set the SST against the flywheel.
2. Remove the crankshaft pulley.
Timing belt
1. Loosen the tensioner lock bolt, and remove the ten-
sioner spring.
2. Mark the timing belt rotation for proper reinstalla-
tion if it is reused.
3. Remove the timing belt.
Caution
Be careful not to allow oil or grease on the
belt.
Camshaft pulley
Remove the pulley lock bolt using a screw driver to
prevent the camshaft from turning.
76G01A-123
1B—27

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.
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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 (TIMING BELT)
TIMING BELT
Torque Specifications
47-65 N m (4.8—6,6 m-kg, 35—49
7—10 N-m (70—100 cm-kg, 61—87 in-ll'
12—17 Nm (1.25—1.75 m-kg, 109—152 in-lbj
167—167 N*m (16.0-17.0 m-kg, 116—123 tt-tti)
1B—64
69G01B-160