timing belt MAZDA 626 1987 Owner's Manual

1 A ON-VEHICLE MAINTENANCE (VALVE SEAL)
VALVE SEAL
Removal
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.
76G01A-114
11. Fuel hose (carb.)
12. Rear housing
13. Rocker arm and shaft assembly
14. Camshaft cap (12-valve)
15. Camshaft
16. Valve keeper
17. Upper valve spring seat
18. Valve spring
19. Lower valve spring seat
20. Valve seal
1. Air cleaner assembly (carb.)
2. Air intake pipe (Fl)
3. High-tension lead and spark plug
4. Upper timing belt cover
5. Timing belt
6. Cylinder head cover
7. Camshaft pulley
8. Front housing
9. Distributor
10. Upper radiator hose
1A—26

1 A ON-VEHICLE MAINTENANCE (VALVE SEAL)
12-valve
O ® ® ® ©
Removal note
Timing belt
Remove the timing belt. (Refer to page 1A—14.)
Rocker arm and shaft assembly
Loosen the rocker arm shaft bolts in two or three steps
in the order shown in the figure.
76G01A-037
8-valve
CD © CD ® © ® ©
12-valve Valve seal
1. Remove the rocker arms and springs from the
rocker arm shaft.
2. Install the camshaft caps and rocker arm shafts
onto the cylinder head.
3. Plug the oil drain hole with a rag to prevent the pos-
sibility of the valve keepers from falling into the oil
pan.
86U01X-045
1A—27

ON-VEHICLE MAINTENANCE (VALVE SEAL) 1 A
76G01A-044
86U01X-212
76G01A-045
(8-valve)
Install the rocker arm and shaft assemblies on the cyl-
inder head and tighten them in three steps in the or-
der shown in the figure.
Tightening torque:
18—26 N-m (1.8—2.7 m-kg, 13—20 ft-lb)
Front housing
1. Replace the oil seal in the front housing.
2. Apply engine oil to the oil seal lip.
3. Install the front housing along with a new gasket.
Tightening torque:
19—25 N-m (1.9—2.6 m-kg, 14—19 ft-lb)
Rear housing
Install the rear housing along with a new gasket.
Tightening torque:
19—25 N-m (1.9—2.6 m-kg, 14—19 ft-lb)
Camshaft pulley
1. Install the camshaft pulley so that the mating mark
is aligned with the camshaft dowel pin straight up.
Note
For FE engine, align "2" mark.
For F8, F6 engine, align "3" mark.
2. Tighten the lock bolt.
Tightening torque:
47—65 N-m (4.8—6.6 m-kg, 35—48 ft-lb)
Timing belt
Install the timing belt. (Refer to TIMING BELT of ON-
VEHICLE MAINTENANCE.)

86U01X-052

1A—32

1 A DISASSEMBLY (TIMING BELT)
TIMING BELT
69G01B-072
6. Timing belt idler pulley
7. Timing belt
8. Camshaft pulley
9. Timing belt pulley
1. Crankshaft pulley
2. Upper timing belt cover
3. Lower timing belt cover
4. Baffle plate
5. Timing belt tensioner and spring
1A—38

DISASSEMBLY (TIMING BELT) 1 A
Mark the
direction of
rotation
76G01A-121
76G01A-122
*
/ V \
T^pJl/1
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
1A—39

INSPECTION AND REPAIR 1 A
Crankpin
,/f
Main journal
76G01A-132
5. If the diameter is less than the minimum, grind the
journals to match undersize bearings.
Undersize bearing: 0.25 mm (0.010 in),
0.50 mm (0.020 in), 0.75 mm (0.030 in)
Main journal diameter undersize mm (in)
Bearing size Journal diameter
025 (0.010)
undersize
No.1,2,4,5 59.693-59.711 (2.3501-2.3508) 025 (0.010)
undersize No.3 59.687-59.705 (2.3499-2.3506)
0.50 (0.020)
undersize
No.1,2,4,5 59.443-59.461 (2.3403—2.3410) 0.50 (0.020)
undersize No.3 59.437-59.455 (2.3400—2.3407)
0.75 (0.030) undersize
No.1,2,4,5 59.193-59.211 (2.3304-2.3311) 0.75 (0.030) undersize No.3 59.187-59.205 (2.3302-2.3309)
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
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-117

1A—60

INSPECTION AND REPAIR 1 A
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: 56.9 mm (2.240 in) FE
64.1 mm (2.524 in) F8, F6
76G01A-134
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-117
1A—61

1 A ASSEMBLY (TIMING BELT)
TIMING BELT
Torque Specifications
6—B N (1.25—1.75 m-kg, 109—152 in-lb)

1
A—82
69G01B-160

ASSEMBLY (TIMING BELT) 1 A
Camshaft Pulley
1. Install the camshaft pulley on the camshaft with the
dowel pin fit into the hole at the 2 mark (FE) or 3
mark (F8, F6).
76G01A-083
2. Tighten the camshaft pulley lock bolt.
Tightening torque:
47—65 N-m (4.8—6.6 m-kg, 35—48 ft-lb)
76G01A-141
3. Align the mating mark on the pulley with the align-
ment mark on the front housing.
Note
For FE engine, align "2" mark.
For F8, F6 engine, align "3" mark.
76G01A-084
Timing Belt Pulley
1. Reverse the direction of the SST (ring gear brake).
2. Install the crankshaft key.
3. Install the timing belt pulley on the crankshaft.
Tightening torque: 157—167 N-m
(16.0—17.0 m-kg, 116—123 ft-lb)
4. Release the ring gear brake.
5. Align the timing belt pulley and the pump body
alignment marks.
86U01X-160

1
A—83

1A ASSEMBLY (TIMING BELT)
Tensioner lock bolt
69G01B-165
76G01A-085
79G01C-097
Timing Belt Idler Pulley
Install the timing belt idler pulley.
Tightening torque:
37—52 Nm (3.8—5.3 m-kg, 27—38 ft-lb)
Timing Belt Tensioner
1. Install the timing belt tensioner and tensioner
spring.
2. Tentatively secure the tensioner with the spring fully
extended.
Timing Belt
1. Install the timing belt, (keep the tension side of belt
as tight as possible.)
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.
2. Loosen the tensioner lock bolt.
3. Turn the crankshaft twice in the direction of rotation.
4. Check that the mating marks are correctly aligned.
If not aligned, remove the timing belt and tension-
er, and repeat the above-mentioned procedure.
5. Tighten the timing belt tensioner lock bolt.
Tightening torque:
37—52 Nm (3.8—5.3 m-kg, 27—38 ft-lb)
4BGQ1A-186
1A—84