1987 MAZDA 626 fuel pressure

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

1B REMOVAL
REMOVAL
Warning: Release the fuel pressure. (Refer to Section 4C.)
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.
76G01B-036
1B—22

DISASSEMBLY (AUXILIARY PARTS) 1 B
1. Oil level gauge
2. P/S oil pump bracket
3. EGR pipe(Unleaded fuel)
4. Exhaust manifold insulator
5. Exhaust manifold assembly
6. Coolant inlet pipe and bypass pipe
7. Engine hanger
8. Alternator
9. Alternator strap and bracket
10. Engine mount bracket
11. Center cover
12. Distributor and high-tension lead
13. Spark plug
14. Thermostat and thermostat cover
15. Intake manifold bracket
16. Intake manifold assembly
17. Oil filter
18. Oil cooler
19. Oil pressure switch
76G01B-039
49 0107 680A Irf^Ys'^
,v,, I
' ir
>

49 G030 D05A
76G01A-120
Disassembly Note
Engine hanger
Remove the exhaust manifold; then connect the SST
to the engine.
69G01X-000
1B—25

TROUBLESHOOTING GUIDE 1 C
SPECIFICATIONS
———Engine model
Item ^—_______ RF-CX RF-N
Type Diesel, 4 cycle
Cylinder arrangement and number In line, 4 cylinders
Combustion chamber Swirl chamber
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 21.1 : 1 22.7 : 1
Compression pressure
kPa (kg/cm2, psi)-rpm
Standard 2.943 (30, 427)-200 Compression pressure
kPa (kg/cm2, psi)-rpm Minimum 2.649 (27, 384)-200
Valve timing
IN Open BTDC 13° 13°
Valve timing
IN Close ABDC 15° 39° Valve timing
EX Open BBDC 60° 60° Valve timing
EX Close ATDC 8° 8°
Valve clearance mm (in)
Cold IN 0.25 (0.010)
Valve clearance mm (in)
Cold EX 0.35 (0.014) Valve clearance mm (in) Warm (for ref.)
IN 0.30 (0.012) Valve clearance mm (in) Warm (for ref.) EX 0.40 (0.016)
Idle speed (MTX in neutral) rpm 720
Injection timing ATDC 10 TDC 0°
Injection order 1_3_4_2
76G01C-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
1C-48 1C—55,56 1C-16
Difficult starting
Malfunction of fuel system Refer to Section 4D
Difficult starting
Malfunction of Comprex supercharger Refer to Section 4D
Difficult starting
Malfunction of electrical system Refer to Section 5
Poor idling Malfunction of engine-related components Improper valve clearance Poor valve to valve seat contact Failed cylinder head gasket
Adjust Repair or replace Replace
1C-85 1C-50 1C—16
Poor idling
Malfunction of fuel system Refer to Section 4D
Poor idling
Malfunction of Comprex supercharger Refer to Section 4D
Excessive oil consumption
Oil working up Worn piston ring groove or sticking piston ring Worn piston or cylinder
Replace Replace or repair
1C-57 1C—55,56
Excessive oil consumption
Oil working down Worn valve seal Worn valve stem or guide
Replace Replace
1C-24 1C-48
Excessive oil consumption
Oil leakage Refer to Section 2B
76G01C-003
1C—3

1C ON-VEHICLE INSPECTION
ON-VEHICLE INSPECTION
If the engine exhibits low power, poor fuel economy,
or poor idle, check the following:
1. Compression
2. Fuel system (Refer to Section 4D)
COMPRESSION
1. Check that the battery is fully charged, Recharge
it if necessary.
76G01C-016
76G01C-017
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 the fuel injection pipes, nozzles, wash-
ers, and corrugate washers.
5. Disconnect the fuel cut valve connector.
Caution
If this is not done, fuel will be injected from
the injection pump while cranking.
6. Connect a suitable cap to the fuel return pipe on
the injection pump.
7. Connect a compression gauge with SST to injec-
tion nozzle hole.
8. Fully depress the accelerator pedal and crank the
engine.
9. Note the maximum gauge reading.
10. Check each cylinder.
Compression pressure kPa (kg/cm2, psi)-rpm
Standard Minimum
2.943 (30, 427)—200 2.649 (27, 384)—200
76G01C-018
Possible Cause
86U01X-022
1C-10

DISASSEMBLY (INJECTION PUMP) 1 C
INJECTION PUMP
76G01C-082
1. No.3 engine mount and idler
2. Injection pipe
3. Injection pump
4. Oil level gauge and stay
5. Oil pipe
6. Fuel feed pipe
7. Oil pressure switch
8. Water pipe
9. Water pump
Disassembly Note
Injection pump
Remove the injection pump with its brackets.
If separate them, adjust the injection timing after in-
stalling the timing belt referring to Section 4D.
76G01C-083
1C-39

ASSEMBLY (INJECTION PUMP) 1 C
Water Pipe
1. Apply a coat of vegetable oil to the O-ring.
2. Install the water pipe.
Tightening torque:
8—11 Nm (80—110 cm-kg, 69—95 in-lb)
3. Connect the water hose.
76G01C-181
^OQOja^q^
cffl-.. M
Oil Pressure Switch
Install the oil pressure switch.
Tightening torque: 12—18 N-m
(1.2—1.8 m-kg, 104—156 in-lb)
76G01C-182
Fuel Feed Pipe and Oil Pipe
1. Install the fuel feed pipe and tighten bolt (A).
Tightening torque:
19—26 N-m (1.9—2.6 m-kg, 14—19 ft-lb)
2. Install the oil pipe and loosely tighten the bolts (B).
76G01C-183
"m
fa?-^ lA-f! . 11
? - ' ~" ~ -'
Oil Level Gauge
Install the oil level gauge and stay.
Tightening torque:
8—12 N-m (80—120 cm-kg, 69—104 in-lb)
76G01C-184
1C-79

INSTALLATION 1C
Heater Hose
Connect the heater hoses.
Note
Position the hose clamp in the original loca-
tion on the hose and squeeze the clamp lightly
with large pliers to ensure a good fit.
86U01X-221
Connector Location
Install each harness as shown in the figure.
1. Alternator
2. Boost air temperature sensor (RF-CX)
3. Heat gauge unit
4. Water thermo switch
5. Pick up coil
6. Glow cord
7. Front harness connector and ground
76G01C-222
8. Fuel cut valve
9. Oil pressure switch
10. Starter
11. Water temperature switch
12. Transaxle harness
13. Grounds
1C—95