check oil MAZDA 626 1987 User Guide

DISASSEMBLY (CYLINDER BLOCK) 1 A
Main bearing cap
Before removing the main bearing caps, clean the
bearings, main journals, and caps, and measure the
following points.
1. Crankshaft end play. (Refer to page 1A—66.)
2. Main journal oil clearance. (Refer to page
1
A—65.)
76G01A-054
Pilot bearing (MTX)
Remove the pilot bearing from the crankshaft with the
SST.
86U01X-076
Piston and connecting rod
1. Before disassembling the piston and connecting
rod, check the oscillation torque as shown in the
figure.
If the large end does not drop by its own weight,
replace the piston or the piston pin.
79G01C-050
2. Remove the piston pin with the SST.
While removing the piston pin, check the pressure.
If it is lower than 5kN (500kg, 1,100 lb), replace
the piston pin or connecting rod.

76G01A-139

1A—47

INSPECTION AND REPAIR 1 A
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
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.
79G01C-106
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:
91.95—92.05 mm (3.620—3.624 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
Measure the manifold contact surface distortion in
the six directions shown in the figure.
Distortion: 0.15 mm (0.006 in) max.
If distortion exceeds specification grind the surface
or replace the cylinder head.
79G01C-053
1A—48

INSPECTION AND REPAIR 1 A
mjjm
H D f IT~inr
86U01X-095
5. Measure the oil clearance of the camshaft and
camshaft caps.
(1) Remove any oil, or dirt from the journals and
bearing surface.
(2) Set the camshaft onto the cylinder head.
(3) Position plasti-gauge on top of the journals in
the axial direction.
(4) Place the camshaft caps and rocker arm shafts
in position, and tighten them to the specified
torque.
Tightening torque:
18—26
N
m (1.8—2.7 m-kg, 13—20 ft-lb)
(5) Remove the camshaft caps and measure the
oil clearance at each cap.
Oil clearance
Front and rear:
0.035—0.085 mm (0.0014—0.0033 in)
Center three journals:
0.065—0.115 mm (0.0026—0.0045 in)
Maximum: 0.15 mm (0.0059 in)
(6) If the oil clearance exceeds the maximum, re-
place the cylinder head.
86U01X-096
6. Measure the camshaft end play. If it exceeds the
maximum, replace the camshaft and/or the cylin-
der head.
End play:
0.08—0.16 mm (0.003—0.006 in)
Maximum: 0.20 mm (0.008 in)
86U01X-097

76G01A-131

1A—54
Rocker Arm and Rocker Arm Shaft
1. Check for wear or damage to the contact surface
of the rocker arm shaft and the rocker arm. Re-
place if necessary.
2. Check the oil clearance between the rocker arm
and shaft. Replace if necessary.
(1) Measure the rocker arm inner diameter.
Diameter:
19.000—19.033 mm (0.7480—0.7493 in)
...12-valve
16.000—16.027 mm (0.6299—0.6310 in)
... 8-valve

INSPECTION AND REPAIR 1 A
76G01A-065
76G01A-066
86U01X-100
(2) Measure the rocker arm shaft diameter.
Diameter:
18.959—18.980 mm (0.7464—0.7472 in)
...12 valve
15.966—15.984 mm (0.6286—0.6293 in)
... 8 valve
(3) Subtract the shaft diameter from the rocker arm
diameter.
Oil clearance mm (in)
Standard Maximum
12-valve 0.020-0.074
(0.0008-0.0029) 0.10 (0.0039)
8-valve 0.016-0.061 (0.0006-0.0024) 0.10 (0.0039)
Hydraulic Lash Adjuster (12-valve)
Check the HLA face for wear or damage. Replace
if necessary.
Caution
Do not remove the HLA unless necessary to
prevent damaging the O-ring.
Cylinder Block
1. Check the cylinder block. Repair or replace if
necessary.
(1) Leakage damage
(2) Cracks
(3) Scoring of wall
2. Measure the distortion of the top surface of the cyl-
inder block in the six directions as shown in the
figure.
Distortion: 0.15 mm (0.006 in) max.
3. If the distortion exceeds the maximum, repair by
grinding, or replace the cylinder block.
Grinding limit: 0.20 mm (0.008 in) max.

86U01X-117

1A—55

INSPECTION AND REPAIR 1A
76G01A-068
Piston
1. Inspect the outer circumferences of all pistons for
seizure or scoring. Replace if necessary.
2. Measure the outer diameter of each piston at a right
angle (90°) to the piston pin, 18 mm (0.709 in)
below the oil ring land lower edge.
Piston diameter mm (in)
Size Diameter

LU
OO LL LL Standard 85.944-85.964 (3.3836-3.3844)
LU
OO LL LL 0.25 (0.010) oversize 86.194-86.214 (3.3935-3.3942)

LU
OO LL LL
0.50 (0.020) oversize 86 444-86.464 (3.4033-3.4041)
F6
Standard 80 944-80.964 (3.1868-3.1876)
F6
0.25 (0.010) oversize 81.194-81.214 (3.1966-3.1974)
F6 0.50 (0.020) oversize 81.444-81.464 (3.2065-3.2072) F6
0.75 (0.030) oversize 81.694-81.714 (3.2163-3.2171)
F6
1.00 (0.039) oversize 81.944-81.964 (3.2261-3,2269)
3. Check the piston to cylinder clearance.
ClGdrsncG1
0.036—0.075 mm (0.0014—0.0030 in)
Maximum: 0.15 mm (0.0059 in)
4. If the clearance exceeds the maximum, replace the
piston or rebore the cylinders to fit oversize pistons.
Caution
If the piston is replaced, replace the piston
rings also.
76G01A-130
Piston and Piston Ring
1. Measure the piston ring to ring land clearance
around the entire circumference using a new pis-
ton ring.
Clearance (Top and Second):
0.03—0.07 mm (0.001—0.003 in)
Maximum: 0.15 mm (0.006 in)
2. If the clearance exceeds the maximum, replace the
piston.
69G01A-125
1A—57

INSPECTION AND REPAIR 1 A
76G01A-070
76G01A-071
86U01X-109
Connecting Rod
1. Measure the connecting rod small end bore.
Diameter: 21.943—21.961 mm (0.8640—0.8646 in)
2. Check the interference between the small end bore
and piston pin.
Interference:
0.013—0.037 mm (0.0005—0.0015 in)
3. Check each connecting rod for bending or twist-
ing. Repair or replace if necessary.
Bend: 0.06 mm (0.0024 in) max.
Twist: 0.06 mm (0.0024 in) max.
Crankshaft
1. Check the journals and pins for damage, scoring,
or oil hole clogging.
2. Set the crankshaft on V-blocks.
3. Check the crankshaft runout at the center journal.
Replace if necessary.
Runout: 0.03 mm (0.0012 in) max.
4. Measure each journal diameter in X and Y direc-
tions at two points.
Main journal
Diameter:
59.937—59.955 mm (2.3597—2.3604 in)
Out-of-round: 0.05 mm (0.0020 in) max.
Crankpin journal
Diameter:
50.940—50.955 mm (2.0055—2.0061 in)
Out-of-round: 0.05 mm (0.0020 in) max.
76G01A-131
1A—59

INSPECTION AND REPAIR 1 A
Crankpin
,/f
Main journal
76G01A-132
5. If the diameter is less than the minimum, grind the
journals to match undersize bearings.
Undersize bearing: 0.25 mm (0.010 in),
0.50 mm (0.020 in), 0.75 mm (0.030 in)
Main journal diameter undersize mm (in)
Bearing size Journal diameter
025 (0.010)
undersize
No.1,2,4,5 59.693-59.711 (2.3501-2.3508) 025 (0.010)
undersize No.3 59.687-59.705 (2.3499-2.3506)
0.50 (0.020)
undersize
No.1,2,4,5 59.443-59.461 (2.3403—2.3410) 0.50 (0.020)
undersize No.3 59.437-59.455 (2.3400—2.3407)
0.75 (0.030) undersize
No.1,2,4,5 59.193-59.211 (2.3304-2.3311) 0.75 (0.030) undersize No.3 59.187-59.205 (2.3302-2.3309)
Rolled fillet
Crankpin journal diameter undersize mm (in)
Bearing size Journal diameter
0.25 (0.010) undersize 50.690—50.705 (1.9957-1.9963)
0.50 (0.020) undersize 50.440-50.455 (1.9858—1.9864)
0.75 (0.030) undersize 50.190-50.205 (1.9760-1.9766)
Caution
Do not grind the rolled fillet area.
76G01A-133
Main Bearing and Connecting Rod Bearing
Check the main bearings and the connecting rod
bearings for peeling, scoring, or other damage.
79G01C-077
Timing Belt
1. Replace the timing belt if there is any oil or grease
on it.
2. Check the timing belt for damage, wear, peeling,
cracks, or hardening. Replace if necessary.

86U01X-117

1A—60

INSPECTION AND REPAIR 1 A
Caution
a) Never forcefully twist, turn inside out, or
bend the timing belt.
b) Be careful not to allow oil or grease on the
belt.
86U01X-114
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.
86U01X-115
Timing Belt Tensioner Spring
Check the free length of the tensioner spring. Replace
if necessary.
Free length: 56.9 mm (2.240 in) FE
64.1 mm (2.524 in) F8, F6
76G01A-134
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 (lower and upper)
Inspect the timing belt covers for damage or cracks.
Replace if necessary.
86U01X-117
1A—61

ASSEMBLY (CYLINDER BLOCK) 1 A
Connecting Rod
1. Assemble the SST to the piston pin.
2. Apply engine oil to the piston pin.
86U01X-118
3. Set the piston on the SST with the F mark facing
upward.
4. Set the connecting rod in piston with the oil hole
in the large end opposite the F mark.
76G01A-135
5. Press the piston pin into the piston and connect-
ing rod until the SST contacts the block.
While inserting the piston pin, check the pressure
force. If it is less than specified, replace the piston
pin or the connecting rod.
Press force:
5—15 kN (500—1,500 kg, 1,100—3,300 lb)
Check the oscillation torque of the connecting rod.
(Refer to page 1A—47.)
76G01A-072
Piston Ring
1. Install the three-piece oil rings on the pistons.
(1) Apply engine oil to the oil ring spacer and rails.
(2) Install the oil ring spacer so that the opening
faces upward.
(3) Install the upper rail and lower rail.
Note
a) The upper rail and lower rail are the same.
b) Each rail can be installed with either face
upward.
69G01A-144
1A—63

1 A ASSEMBLY (CYLINDER BLOCK)
Spacer iang
Oil ring
spacer ends
Upper rail
Piston
Lower rail
69G01A-145
86U01X-121
Oil ring —
upper rail f .Top ring
Oil ring (
spacer r \30° \ . Pistion
^-^/ao0F pin
Oil ring
lower rail /Second ring
69G01A-147
2. Check that both rails are expanded by the spacer
tangs as shown in the figure by checking that both
rails turn smoothly in both directions.
3. Install the second ring to the piston first, then in-
stall the top ring. Use a piston ring expander.
Caution
The rings must be installed with the "R"
marks facing upward.
4. Apply a liberal amount of clean engine oil to the
second and top piston rings.
5. Position the opening of each ring as shown in the
figure.
Crankshaft
1. Before installing the crankshaft, inspect the main
bearing oil clearances as described.
Note
The bearing with thrust shoulders is the cen-
ter bearing in the cylinder block.

86U01X-136

1A—64