1987 MAZDA 626 length

ON-VEHICLE MAINTENANCE (CYLINDER HEAD) 1 C
76G01C-037
Apply engine oil
/
Cylinder head bolt
below head length
76G01C-038
(8) (4; D (5)
® ®
76G01C-039
3m-kg
(21.7ft-lb
Installation
Cylinder head
1. Throughly remove all dirt and grease from the top
of the cylinder block with a rag.
2. Place the new cylinder head gasket in position.
3. Remove any dirt and grease from the bottom sur-
face of the cylinder head.
4. Place the cylinder head in position.
5. Measure the length of the cylinder head bolt be-
low the head. If the length exceeds the maximum,
replace the bolt.
Length: 113.2—113.8 mm (4.457—4.480 in)
Maximum: 114.5 mm (4.508 in)
6. Apply engine oil to the threads and the seat face
of the cylinder head bolts.
7. Tighten the cylinder head bolts.
(1) Tighten the bolts to the specified torque, in the
order shown in the figure.
Tightening torque:
29 N-m (3.0 m-kg, 22 ft-lb)
(2) Make paint marks on the bolt heads, as shown
in the figure.
(3) With the paint marks as a reference point, turn
the cylinder head bolts another 90°
(90°—105°) in the tightening direction. Tight-
en them in the order.
(4) Then tighten them once again 90°
(90°—105°) in the tightening order.
Caution
Be absolutely sure that the bolts are tightened
in the proper order.

76G01C-044

1C—20

1 C DISASSEMBLY (TIMING BELT)
Injection pump pulley
1. Put two bolts of 35—40 mm (1.4—1.6 in) length
into the arms of the injection pump pulley and af-
fix them in the threaded hole of the injection pump
bracket.
2. Loosen the injection pump pulley lock bolt.
3. Separate the injection pump pulley from the injec-
tion pump shaft with the SST.
Camshaft pulley
1. Hold the camshaft with a wrench (29 mm, 1.14 in)
and loosen the camshaft pulley lock bolt.
Caution
Do not damage the cylinder head edge with
the wrench.
2. Separate the camshaft pulley from the camshaft
with the SST.
Caution
Do not hit the camshaft pulley with a hammer.
Rear camshaft pulley
Remove the rear camshaft pulley in the same man-
ner used for camshaft pulley.
4BG01B-087
76G01C-081
1C—38

1C INSPECTION AND REPAIR
Stem tip
Margin i
thickness
T
Valve face
angle
^45°
76G01C-101
76G01C-102
" & ©
JMFc
•^Caliper gauge
^V^r "M
m
Valve and Valve Guide
1. Inspect each valve for the following. Replace or
resurface if necessary.
(1) Damaged or bent stem
(2) Roughness or damage to face
(3) Damage or uneven wear of stem tip
2. Check the valve head margin thickness. Replace
if necessary.
Margin thickness mm (in)
RF-CX IN 1.80 (0.071) RF-CX EX 1.65 (0.065)
RF-N IN 0.80 (0.031) RF-N EX 0.80 (0.031)
3. Measure the valve length.
Length
IN : 106.9 mm (4.209 in)
EX: 106.8 mm (4.205 in)
4. Measure the valve stem diameter.
Diameter
IN : 7.970—7.985 mm (0.3138—0.3144 in)
EX: 7.965—7.980 mm (0.3136—0.3142 in)
5. Measure the valve guide inner diameter.
Inner diameter
IN : 8.025—8.045 mm (0.3159—0.3167 in)
EX: 8.025—8.045 mm (0.3159—0.3167 in)
76G01C-103
-Valve stem
Valve guide

Clearance
V
6. Measure the valve stem to guide clearance.
(1) Method No. 1
Subtract the outer diameter of the valve stem
from the inner diameter of the corresponding
valve guide.
Clearance
IN : 0.040—0.075 mm (0.0016—0.0030 in)
EX: 0.045—0.080 mm (0.0018—0.0031 in)
Maximum: 0.10 mm (0.004 in)
7.
If
the clearance exceeds the maximum, replace the
valve and/or valve guide.

76G01C-111

1C-48

INSPECTION AND REPAIR 1C
76G01C-116
76G01C-117
—Angle limit
S//////A 777;////////
Combustion Chamber Insert
1. Inspect the combustion chamber insert for damage
or crack, replace if necessary.
2. Mesure the receded or projected amount of com-
bustion chamber insert from cylinder head surface.
Recession: 0.020 mm (0.0008 in) max.
Projection: 0.005 mm (0.0001 in) max.
If it exceeds the specification, replace the combus-
tion chamber insert and the cylinder head as an as-
sembly.
Valve Spring
1. Inspect each valve spring for cracks or damage.
2. Check the free length and angle. Replace if
necessary.
Free length: 45.11 mm (1.776 in)
Minimum: 44.8 mm (1.764 in)
Angle: 1.6 mm (0.06 in) max.
76G01C-118
Tappet
1. Check the tappet to tappet hole clearance.
(1) Measure the tappet outer diameter.
Diameter:
34.95—34.97 mm (1.3764—1.3768 in)

76G01C-144

1C-52

INSPECTION AND REPAIR 1C
86U01X-115
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.
Timing Belt Tensioner Spring
Check the free length of the tensioner spring. Replace
if necessary.
Free length:
52.6 mm (2.071 in)
76G01C-251
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
Inspect the timing belt covers for damage or cracks.
Replace if necessary.
76G01C-146
1C—61

1 C ASSEMBLY (CYLINDER
BLOCK)

76G01C-170
Adjusting
disc
Tappet -
Apply engine oil
4BG01B-150
4BG01B-182
Apply engine oil
1.
Cylinder head bolt
below head length
Valve and Valve Spring
1. Install the lower spring seat.
2. Apply molybdenum disulphide grease to the valve
stem.
3. Install the valve.
4. Install the valve springs and the upper spring seat.
5. Compress the valve spring with the SST; then in-
stall the valve keepers.
6. Tap the end of the valve stem lightly two or three
times with a plastic hammer to confirm that the
keepers are all fully seated.
Tappet and Adjusting Disc
1. Apply engine oil to the tappets.
2. Install the tappets in the hole.
3. Install the adjusting discs.
Cylinder Head
1. Thoroughly remove all dirt and grease from the top
of the cylinder block with a rag.
2. Place the new cylinder head gasket in position.
3. Remove any dirt or grease from the bottom sur-
face of the cylinder head.
4. Place the cylinder head in position.
5. Measure the length of the cylinder head bolt be-
low the head. If the length exceeds the maximum,
replace the bolt.
Length: 113.2—113.8 mm (4.457—4.480 in)
Maximum: 114.5 mm (4.508 in)
76G01C-171
1C-74

OIL
COOLER AND
OIL
FILTER BODY 2B

OIL
COOLER AND
OIL
FILTER BODY
REMOVAL
1. Disconnect the battery negative cable.
2. Drain the engine oil and coolant.
3. Remove in the sequence shown in the figure.
76G02B-012
76G02B-013
1. Idler pulley
2. Water hose
3. Connector bolt
4. Oil cooler
5. Oil filter
6. Oil filter cover
7. Oil filter body
8. Plug
9. Pressure spring
10. Plunger control
11. Relief valve spring
12. Steel ball
INSPECTION
1. Inspect the oil cooler body for cracks or corrod-
ed. If necessary replace it.
2. Check the valves for damage or scoring if neces-
sary replace it.
3. Measure free length of each valve spring. If neces-
sary replace it.
Free length
Relief valve spring: 45.5 mm (1.79 in)
Pressure spring : 54.6 mm (2.15 in)
76G02B-014
2B-7

VIC SYSTEM 4C
VARIABLE INERTIA CONTROL
(VIC)
SYSTEM
The VIC system supplements the intake air's inertial effect to create a torque band that runs from low
rpm through the high rpm range.
The system consists of the intake manifold, shutter valves, dynamic chambers, actuator, one-way check
valve, three-way solenoid valve, and engine control unit.
Shutter valve
Shutter valve
76G04C-065
Intake Inertia Effect
The air within the dynamic chamber and intake manifold begins to flow during the first half of the air
intake process. This air flow pushes air into the cylinder by its own inertial force during the second
half of the air intake process. This improves the charging of the cylinder.
To most effectively put this inertia charging to use, the length of the manifold leading to the dynamic
chamber needs to be changed in response to the engine rpm.
Length of intake manifold Intake inertia effect
Long Effective at low and middle speed
Short Effective at high speed
The VIC system controls the length of the intake manifold travel by switching the shutter valve either
open or closed at the specified engined rpm.
expert22 fl/i* http://rutracker.org
4C—39