1987 MAZDA 626 fuel

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 (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

1A REMOVAL
REMOVAL
Warning: Release the fuel pressure. (Refer to Section 4.)
1. Disconnect the negative battery cable.
2. Drain the engine oil and coolant.
3. Remove in the sequence shown in the figure referring to the removal note for specially marked parts.
76GG1A-117
1A—34

REMOVAL 1A
1. Battery and battery carrier 13. Three-way solenoid 22. P/S oil pump
2. Air cleaner assembly assembly 23. Engine side cover
3. High-tension lead 14. Canister hose (Fl, Middle 24. Front wheel
4. Accelerator cable East) 25. Tie-rod end
5. Throttle cable (ATX) 15. Heater hose 26. Stabilizer control rod
6. Fuel hose 16. Transaxle harness 27. Lower arm bushing
7. Radiator hose 17. Speedometer cable 28. Driveshaft
8. ATF hose (ATX) 18. Clutch release cylinder 29. Change rod (MTX)
9. Radiator harness (MTX) 30. Extension bar (MTX)
10. Radiator and cooling fan 19. Control cable (ATX) 31. Exhaust pipe
11. Engine harness 20. Drive belt 32. Engine mount
12. Brake vacuum hose 21. A/C compressor and 33. Engine and transaxle
bracket 34. Transaxle
76G01A-046
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.
76G01A-11E
P/S pump, A/C compressor
Remove the P/S pump and A/C compressor with the
hoses still connected to them, secure the pump and
compressor as shown in the figure.
67U01X-029
Driveshaft
Remove the driveshafts. (Refer to Section 9.) Slide
the SST into the transaxle.
86U01X-060
1A—35

1A INSTALLATION
76G01A-147
86U01X-199
86U01X-200
Radiator
1. Install the radiator and cooling fan.
Tightening torque:
8—11 N-m (80—110 cm-kg, 69—95 in-lb)
2. Connect the radiator harness.
3. Connect the ATF hoses (ATX).
4. Connect the upper and lower radiator hoses.
Note
a) Position the hose clamp in the original lo-
cation on the hose.
b) Squeeze the clamp lightly with large pliers
to ensure a good fit.
Heater Hose and Fuel Hose
Connect the heater hoses and the fuel hoses.
High-Tension Lead
Connect the high-tension lead to the ignition coil.
Accelerator Cable
Install the accelerator cable and the throttle cable
(ATX).
76G01A-148
Battery and Battery Carrier
1. Install the battery carrier.
Tightening torque:
9—13 N-m (90—130 cm-kg, 78—113 in-lb)
2. Install the fuse box.
Tightening torque:
8—11 N-m (80—110 cm-kg, 69—95 in-lb)
3. Install the battery tray and battery.
Tightening torque:
5_7 Nm (50—70 cm-kg, 43—61 in-lb)
1A—98

TROUBLESHOOTING GUIDE 1 B
SPECIFICATIONS
Engine model FE DOHC
Item Leaded fuel Unleaded fuel
Type Gasoline, 4 cycle
Cylinder arrangement and number In line, 4 cylinders
Combustion chamber Pentroof
Valve system OHC, belt driven
Displacement cc (cu in) 1,998 (121.9)
Bore and stroke mm (in) 86.0 x 86.0 (3.39 x 3.39)
Compression ratio 10.0 : 1 9.2 : 1
Compression pressure Standard 1,422 (14.5, 206)—290 1,373 (14.0, 199)—310
kPa (kg/cm2, psi)-rpm Minimum 996 (10.2, 144)—290 961 (9.8, 139)—310
IN Open BTDC 10° 10°
Valve timing
IN Close ABDC 60° 55° Valve timing
EX Open BBDC 60° 55° EX Close ATDC 10° 10°
Valve clearance mm (in) IN 0; Maintenance-free Valve clearance mm (in) EX 0; Maintenance-free
Idle speed rpm 750 ± 50
Ignition timing BTDC 12° ± 1°
Firing order 1—3--4-2
76G01B-002
TROUBLESHOOTING GUIDE
Problem Possible Cause Remedy Page
Difficult starting Malfunction of engine-related components
Burned valve
Worn piston, piston ring, or cylinder
Failed cylinder head gasket
Replace
Replace or repair Replace
1B—35 1B—43 1B—16
Malfunction of fuel system Refer to Section 4C
Malfunction of electrical system Refer to Section 5
Poor Idling Malfunction of engine-related components Malfunction of HLA
Poor valve to valve seat contact
Failed cylinder head gasket
Replace
Repair or replace
Replace
1B—60 1B—37 1B—16
Malfunction of fuel system Refer to Section 4C
Excessive oil
consumption Oil working up Worn piston ring groove or sticking piston ring Worn piston or cylinder
Replace
Replace or repair
1B-43 1B-43
Oil working down
Worn valve seal
Worn valve stem or guide
Replace
Replace 1B-35
Oil leakage Refer to Section 2A
76G01B-003
1B—3

TROUBLESHOOTING GUIDE 1 B
Problem Possible Cause Remedy Page
Insufficient power Insufficient compression Malfunction of HLA Compression leakage from valve seat Seized valve stem Weak or broken valve spring Failed cylinder head gasket Cracked or distorted cylinder head Sticking, damaged, or worn piston ring Cracked or worn piston
Replace Repair
Replace
Replace Replace Replace Replace Replace
1B—60 1B—37 1B—35 1B—38 1B-16 1B—34 1B—43 1B—43
Malfunction of fuel system Refer to Section 4C
Others Slipping clutch Dragging brakes Wrong size tires
Refer to Section 6 Refer to Section 11 Refer to Section 12
Abnormal combustion Malfunction of engine-related components Malfunction of HLA Sticking or burned valve
Weak or broken valve spring Carbon accumulation in combustion chamber
Replace Replace Replace
Eliminate carbon
1B-60
1B-35
1B—38
Malfunction of fuel system Refer to Section 4C
Engine noise Crankshaft or bearing related parts
Excessive main bearing oil clearance Main bearing seized or heat-damaged Excessive crankshaft end play Excessive connecting rod bearing oil clearance Connecting rod bearing seized or heat-damaged
Replace or repair Replace
Replace or repair Replace or repair Replace
1B-51 1B—51 1B—52 1B—53 1B—53
Piston related parts
Worn cylinder Worn piston or piston pin Seized piston Damaged piston ring Bent connecting rod
Replace or repair
Replace
Replace Replace Replace
1B—41 1B-44 1B—43 1B—43 1B-44
Valves or timing related parts Malfunction of HLA* Broken valve spring Excessive valve guide clearance Malfunction of timing belt tensioner
Replace Replace Replace Replace
1B-60 1B—38 1B—35 1B—47
Malfunction of cooling system Refer to Section 3A
Malfunction of fuel system Refer to Section 4C
Others Malfunction of water pump bearing Improper drive belt tension Malfunction of alternator bearing Exhaust gas leakage
Replace Adjust Replace Repair
1B— 6
1B—34
* Tappet noise may occur if the engine is not operated for an extended period of time. The noise should stop after the engine has reached normal operating temperature. 76G01B-004
1B—4

1 B ON-VEHICLE INSPECTION
76G01B-017
86U01X-020
76G01B-018
Possible Cause
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 4C)
COMPRESSION
1. Check that the battery is fully charged. Recharge
if necessary.
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.
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.
Standard compression:
1,422 kPa (14.5 kg/cm2, 206 psi)—290 rpm
Leaded fuel
1,373 kPa (14.0 kg/cm2,199 psi)—310 rpm
... Unleaded fuel
Compression limit:
996 kPa (10.2 kg/cm2, 144 psi)—290 rpm
Leaded fuel
961 kPa (9.8 kg/cm2, 139 psi)—310 rpm
... Unleaded fuel
If compression is low, pour heavy oil into the cylinder and turn the crankshaft several times Check compression once more
»
Is compression increased? Yes 1. Worn piston or piston rings
2. Worn cylinder wall
No
1. Worn piston or piston rings
2. Worn cylinder wall
No 1. Defective cylinder head gasket 2. Distorted cylinder head
Is compression in adjacent cylinder low? Yes
1. Defective cylinder head gasket 2. Distorted cylinder head
Is compression in adjacent cylinder low?
No 1. Improper valve seating
2. Valve sticking in guide
3. Defective cylinder head gasket
86U01X-022
1B—10