1987 MAZDA 626 engine

ON-VEHICLE INSPECTION 1 A
ON-VEHICLE INSPECTION
If the engine exhibits low power, poor fuel economy,
or poor idle, check the following points.
1. Ignition system (Refer to Section 5)
2. Compression
3. Fuel system (Refer to Section 4)
COMPRESSION
1. Check that the battery is fully charged. Recharge
if necessary.
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2. Warm up the engine to the normal operating tem-
perature.
3. Turn it off for about 10 minutes to allow the exhaust
manifold to cool.
4. Remove all spark plugs.
5. Disconnect the primary wire connector from the
ignition coil.
86U01X-020
6. Connect a compression gauge to No.
1
spark plug
hole.
7. Fully depress the accelerator pedal and crank the
engine.
8. Note the maximum gauge reading.
9. Check each cylinder.
Compression pressure kPa (kg/cm2, psi)-rpm
Standard Minimum
F6 1,128 (11.5, 164)—270 790 (8.1, 114)—270
F8-FE 1,275 (13.0, 185)—270 893 (9.1, 129)—270
FE 12-valve 1,422 (14.5, 206)—280 996 (10.2, 144)—280
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Possible Cause
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1A—13

1 A ON-VEHICLE MAINTENANCE (TIMING BELT)
ON-VEHICLE MAINTENANCE
TIMING BELT
Removal
1. Disconnect the negative battery cable.
2. Remove in the sequence shown in the figure referring to the removal note for specially marked parts.
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1. High-tension lead and spark plug
2. Engine side cover
3. Drive belt
4. Crankshaft pulley
5. Upper timing belt cover
6. Lower timing belt cover
7. Baffle plate
8. Timing belt tensioner
9. Timing belt tensioner spring
10. Timing belt
1A—14

1 A ON-VEHICLE MAINTENANCE (TIMING BELT)
Removal note
Timing belt tensioner
1. Turn the crankshaft to align the mating mark of the
camshaft pulley with the front housing timing mark.
Note
For FE engine, align "2" mark.
For F8, F6 engine, align "3" mark.
2. Remove the tensioner.
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Timing belt
Mark the timing belt rotation for proper reinstallation
if it is reused.
Caution
Be careful not to allow oil, grease, or water
on the belt.
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Inspection
Inspect the following parts.
(Refer to page 1A—60, 61.)
1. Timing belt
2. Timing belt tensioner and spring
3. Timing belt idler pulley
4. Timing belt pulley
5. Camshaft pulley
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1A—15

ON-VEHICLE MAINTENANCE (TIMING BELT) 1 A
76G01A-027
76G01B-024
76G01A-028
/Jf
ry.
2. Check that the mating mark of the camshaft pul-
ley is aligned with the timing mark. If it is not
aligned, turn the camshaft to align.
Note
For FE engine, align "2" mark.
For F8, F6 engine, align "3" mark.
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.
4. 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.
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.
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1A-17

1 A ON-VEHICLE MAINTENANCE (TIMING BELT)
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)
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Steps After Installation
Perform the necessary engine adjustment. (Refer to
TUNE-UP PROCEDURE.)
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1A—19

1 A ON-VEHICLE MAINTENANCE (CYLINDER HEAD)
CYLINDER HEAD
Removal
Warning: Release the fuel pressure. (Refer to Section 4.)
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.
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1A—20

1 A ON-VEHICLE MAINTENANCE (CYLINDER HEAD)
1. High-tension lead and spark plug
2. Accelerator cable
3. Throttle cable (ATX)
4. Air intake pipe (Fl)
5. Air cleaner assembly (carb.)
6. Fuel hose
7. Fuel pump (carb.)
8. Upper radiator hose
9. Heater hose
10. Brake vacuum hose
11. Canister hose (Fl, Middle East)
12. Three-way solenoid assembly
13. Engine harness connector and ground
14. Secondary air pipe assembly (except
General)
15. EGR pipe (Fl, Unleaded carb.)
16. Exhaust manifold insulator
17. Exhaust pipe
18. Exhaust manifold
19. Gusset plate (Fl)
20. Intake manifold bracket (Fl)
21. Intake manifold assembly
22. Distributor
23. A/C compressor and bracket
24. Upper timing belt cover
25. Timing belt tensioner spring
26. Timing belt
27. Cylinder head cover
28. Cylinder head and gasket 76G01A-031
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.
Timing belt
1. Before removing the timing belt, turn the crankshaft
to align the mating mark of the camshaft pulley with
the front housing timing mark.
Note
For FE engine, align "2" mark.
For F8, F6 engine, align "3" mark.
2. Loosen the timing belt tensioner lock bolt.
3. Shift the tensioner outward as far as possible, then
temporarily tighten it.
1A—21

1 A 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.
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® (5)
CD
© (8)
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)
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Cylinder head cover
1. Apply silicon sealant to the shaded area shown in
the figure.
2. Install the cylinder head cover.
Tightening torque:
6—8
N
m (60—80 cm-kg, 52—69 in-lb)
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Timing belt
1. Align the mating mark of the camshaft pulley with
the front housing timing mark.
Note
For FE engine, align "2" mark.
For F8, F6 engine, align "3" mark.
2. Install the timing belt. (Refer to TIMING BELT of
ON-VEHICLE MAINTENANCE.)
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1A—24