1987 MAZDA 626 water

ON-VEHICLE MAINTENANCE (CYLINDER HEAD) 1 B
Distributor
1. Apply engine oil to the O-ring, and position it on
the distributor.
2. Apply engine oil to the blade.
3. Install the distributor.
4. Loosely tighten the distributor mounting bolt.
76G01A-035
Engine harness connector
Install the engine harness connectors.
1. IG coil
2. Heat gauge unit
3. Speed sensor
4. P/S switch
5. Engine ground
6. Water tempera-
ture sensor
7. Water thermo
switch
8. Crank angle
sensor
9. Oxygen sensor
10. Linear solenoid
11. Solenoid valve
(idle speed
control)
12. Throttle position
sensor
13. Injection harness
76G01B-035
Steps After Installation
1. Fill the radiator with the specified amount and type
of coolant.
2. Perform the necessary engine adjustments. (Re-
fer to TUNE-UP PROCEDURE.)
86U01X-041
1B-21

1 B DISASSEMBLY (AUXILIARY PARTS)
DISASSEMBLY
1. Remove in the sequence shown in the figure referring to the disassembly note for specially marked
parts.
2. Code all identical parts (such as pistons, piston rings, connecting rods, and valve springs) so that
they can be reinstalled in the cylinder from which they were removed.
3. Clean the parts with steam, blow off any remaining water with compressed air.
Note
Care should be taken during the disassembly of any part or system to study its order of
assembly. Any deformation, wear, or damage should also be noted.
AUXILIARY PARTS
76G01A-119
1B—24

1 B DISASSEMBLY (CYLINDER BLOCK)
CYLINDER BLOCK-I
76G01B-043
1. Clutch cover 6. Oil strainer
2. Clutch disc 7. Rear cover
3. Flywheel 8. Water pump assembly
4. End plate 9. Oil pump assembly
5. Oil pan 10. Oil jet
1B—30

1 B INSPECTION AND REPAIR
INSPECTION AND REPAIR
1. Clean all parts, taking care to remove any gasket fragments, dirt, oil or grease, carbon, moisture
residue, or other foreign materials.
2. Inspect and repair must be performed in the order specified.
Caution
Be careful not to damage the joints or friction surfaces of aluminum alloy components (such
as the cylinder head or pistons).
86U01X-077
79G01C-106
76G01B-051
Cylinder Head
1. Inspect the cylinder head for damage, cracks, and
leakage of water or oil. Replace if necessary.
2. Measure the cylinder head distortion in the six
directions shown in the figure.
Distortion: 0.15 mm (0.006 in) max.
3. If the cylinder head distortion exceeds specifica-
tion, grind the cylinder head surface.
If the cylinder head height is not within specifica-
tion, replace it.
Height:
133.95—134.05 mm (5.274—5.278 in)
Grinding limit: 0.20 mm (0.008 in) max.
Note
Before grinding the cylinder head, first check
the following. Replace if necessary.
• Sinking of valve seat
• Damage of manifold contact surface
• Camshaft oil clearance and end play
4. Measure the manifold contact surface distortion in
the six directions shown in the figure.
Distortion: 0.15 mm (0.006 in) max.
5. If distortion exceeds specification grind the surface
or replace the cylinder head.
79G01C-053
1B-34

1 B INSPECTION AND REPAIR
Valve guide

-Valve stem
I/
Clearance
6. Measure the valve stem to guide clearance by sub-
tract the outer diameter of the valve stem from the
inner diameter of the corresponding valve guide.
Clearance
IN : 0.025—0.060 mm (0.0010—0.0024 in)
EX: 0.030—0.065 mm (0.0012—0.0026 in)
Maximum: 0.20 mm (0.0079 in)
7. If the clearance exceeds the maximum, replace the
valve and/or valve guide.
76G01B-122
76G01B-054
8. Check that the valve guide projection height
(dimension A in the figure). Replace if necessary.
Height: 11.4—11.9 mm (0.449—0.469 in)
Replacement of valve guide
Note
Although the shapes of the intake and exhaust
valve guides are different.
76G01B-123
Removal
1. Gradually heat the cylinder head in water to ap-
prox. 90°C (194°F).
86U01X-083
1B-36

INSPECTION AND REPAIR 1 B
2. Remove the valve guide from the side opposite the
combustion chamber with the SST.
86U01X-084
Installation
1. Gradually heat the cylinder head in water to ap-
prox. 90°C (194°F).
2. Tap the valve guide in from the side opposite the
combustion chamber with the SST until the projec-
tion height is as specified.
76G01B-124
- d
O") (o o
/y^X'/i— l/o\ 1| 1
Valve Seat
1. Inspect the contact surface of the valve seat and
valve face for the following.
(1) Roughness
(2) Damage
2. If necessary, resurface the valve seat with a 45°
valve seat cutter and/or resurface the valve face.
86U01X-087
3. Apply a thin coat of prussian blue to the valve face.
4. Check the valve seating by rotating the valve
against the seat.
(1) If blue does not appear 360° around the valve
face, replace the valve.
(2) If blue does not appear 360° around the valve
seat, resurface the seat.
69G01A-101
1B—37

1 B ASSEMBLY (CYLINDER BLOCK)
Water Pump
1. Remove all dirt, grease, and other material from
the water pump mounting surface.
2. Place a new O-ring in position.
Caution
Do not reuse the original O-ring.
86U01X-142
3. Install the water pump.
Tightening torque:
19—25 Nm (1.9—2.6 m-kg, 14—19 ft-lb)
7BU01B-103
1B-58

INSTALLATION 1B
Connector Location
Install each harness as shown in the figure.
76G01B-112
1. IG coil 10. Linear solenoid
2. Heat gauge unit 11. Solenoid valve (idle speed control)
3. Speed sensor 12. Throttle position sensor
4. P/S switch 13. Injection harness
5. Engine ground 14. Transmission harness
6. Water temperature sensor 15. Alternator
7. Water thermo switch 16. Oil pressure switch
8. Crank angle sensor 17. Starter
9. Oxygen sensor
1B-79