1987 MAZDA 626 oil

DISASSEMBLY (CYLINDER BLOCK) 1 C
CYLINDER BLOCK—I
76G01C-091
1. Clutch cover
2. Clutch disc
3. Flywheel
4. End plate
5. Oil pan
6. Oil strainer
7. Stiffener (RF-CX)
8. Rear cover
9. Timing belt pulley
10. Oil pump assembly
Flywheel
1. Install the SST to the flywheel.
2. Remove the clutch cover, clutch disc and flywheel.
Timing belt pulley
1. Reverse the direction of the SST.
2. Remove the timing belt pulley.
76G01C-092
1C—43

1 C DISASSEMBLY (CYLINDER BLOCK)
Oil pan
1. Remove the oil pan mounting bolts.
2. Insert a scraper or a suitable tool between the oil
pan and the stiffener to separate them.
Caution
Do not bend the oil pan when prying loose.
3. Remove the oil pan.
86U01X-072
1C—44

DISASSEMBLY (CYLINDER BLOCK) 1 C
CYLINDER BLOCK—II
76G01C-093
1. Connecting rod cap
2. Connecting rod bearing
3. Connecting rod and piston
4. Piston ring
5. Snap ring
6. Piston pin
7. Main bearing cap
8. Crankshaft
9. Main bearing
10. Pilot bearing
11. Oil jet
12. Cylinder block
Disassembly Note
Connecting rod and cap
During disassembly, clean the bearing, connecting
rod, and crankpin, and measure the following:
1. Connecting rod side clearance. (Refer to page
1C-67.)
2. Crankpin oil clearance.(Refer to page 1C—66.)
76G01C-094
1C-45

1 C DISASSEMBLY (CYLINDER BLOCK)
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.
76G01C-095
2. Remove the snap rings from the piston.
3. Remove the piston pin with the SST.
76G01C-249
76G01C-096
Main bearing cap
During disassembly, clean the bearings, main jour-
nals, and caps, and measure the following:
1. Crankshaft end play. (Refer to page 1C—65.)
2. Main journal oil clearance. (Refer to page 1C—64.)
Pilot bearing
Remove the pilot bearing from the crankshaft with the
SST.
76G01C-097
1C—46

INSPECTION AND REPAIR 1C
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 seven
directions shown in the figure.
Distortion: 0.10 mm (0.004 in) max.
76G01C-098
3. If the cylinder head distortion exceeds specificati-
on replace the cylinder head.
Height:
133.9—134.1 mm (5.272—5.280 in)
Caution
Do not attempt to repair a cylinder head by
milling or grinding.
76G01C-099
4. Measure the manifold contact surface distortion in
the three directions shown in the figure.
Distortion: 0.20 mm (0.008 in) max.
5. If distortion exceeds specification replace the cyl-
inder head.
76G01C-100
1C—47

INSPECTION AND REPAIR 1C
n a. n _ n
76G01C-124
76G01C-250
76G01C-125
5. Measure the oil clearance of the camshaft.
(1) Remove the tappets and adjusting discs from
the cylinder head, and separate them by
cylinder.
(2) Clean the camshaft and cylinder head journal.
(3) Install the camshaft into position.
(4) Set a Plasti-gauge on the camshaft journal in
the axial direction.
(5) Install the camshaft caps according to the num-
ber and arrow marks.
(6) Tighten the camshaft caps evenly and in ord-
er shown in the figure.
Tighten torque:
20—26 Nm (2.0—2.7 m-kg, 14—20 ft-lb)
(7) Remove the camshaft caps and measure the
oil clearance.
Oil clearance:
0.025—0.066 mm (0.0010—0.0026 in)
Maximum: 0.10 mm (0.004 in)
(8) If the oil clearance exceeds the maximum,
replace the cylinder head or camshaft.

76G01C-144

1C-54

INSPECTION AND REPAIR 1C
-Clearance
3. Check the piston to cylinder clearance.
Clearance-
0.032—0.050 mm (0.0013—0.0020 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.
Note
If the piston is replaced, replace the piston
rings also.
76G01C-134
69G01A-125
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)
RF-CX: 0.18—0.22 mm (0.0071—0.0087 in)
RF-N : 0.05—0.09 mm (0.0020—0.0035 in)
Clearance (Second):
0.04—0.08 mm (0.0016—0.0031 in)
Maximum: 0.2 mm (0.008 in)
2.
If
the clearance exceeds the maximum, replace the
piston.
3. Inspect the piston rings for damage, abnormal
wear, or breakage. Replace if necessary.
4. Insert the piston ring into the cylinder by hand and
push it to the bottom of the ring travel in using the
piston.
86U01X-104
5. Measure each piston ring end gap with a feeler
gauge. Replace if necessary.
End gap (Top and second)
RF-CX: 0.20—0.35 mm (0.008—0.014 in)
RF-N : 0.20—0.40 mm (0.008—0.016 in)
End gap (Oil rail):
0.20—0.40 mm (0.008—0.016 in)
Maximum: 1.0 mm (0.039 in)

76G01C-144

1C-57

INSPECTION AND REPAIR 1C
Piston and Piston Pin
1. Measure the piston pin hole diameter in X and Y
directions at four points.
Diameter mm (in)
RF-CX 29.997-30.007 (1.1810-1.1814)
RF-N 24.997-25.007 (0.9841-0.9845)
76G01C-137
76G01C-139
2. Measure the piston pin diameter.
Diameter mm (in)
RF-CX 29.994-30.000 (1.1809-1.1811)
RF-N 24.994-25.000 (0.9840-0.9843)
3. Determine the piston pin to piston clearance by
subtracting the two figures.
Clearance-
-0.003—0.013 mm (0.0001—0.0005 in)
4. If the clearance exceeds the specification, replace
the piston and/or piston pin.
Connecting Rod
1. Measure the connecting rod small end bore.
Diameter mm (in)
RF-CX 30.014-30.030 (1.1817-1.1823)
RF-N 25.014-25.030 (0.9848-0.9854)
2. Check the clearance between the small end bore
and piston pin.
Clearance*
0.014—0.036 mm (0.0005—0.0015 in)
Maximum: 0.05 mm (0.002 in)
3. If the clearance exceeds the maximum, replace the
connecting rod bushing.
(1) Apply engine oil to the connecting rod and the
bushing.
(2) Align the oil holes of the connecting rod and
the bushing, and press the bushing in.
(3) Correct the bushing inner diameter, so that the
clearance is within the specification, by using
a spiral expansion reamer.

76G01C-144

1C-58