1992 MAZDA PROTEGE lock

82 DISASSEMBLY
03UOB2-071 6
- ____-______---..----. 05UOBX 113
------ -__ .---
7
Disassembly Note
Connecting rod cap
1. Before removing the connecting rod caps, measure the con-
necting rod side clearance. (Refer to page B2-71.) 1
Connecting rod
1. Before removing the connecting rods, measure the connect-
ing rod oil clearance. (Refer to page B2-71.)
2. Remove the Plastigage from the crankpin journals,
Caution
l Do not scratch the crankshaft journal or the cylin-
der wall.
-,
3. Use the handle of a hammer to remove the piston and con-
necting rod assembly through the top of the cylinder block.
Piston ring
Caution
l Do not apply excessive tension, which may cause
the rings to snap out.
1. Remove the piston rings with a piston ring expander (com-
mercially available).
Piston pin
1. Remove the piston pin with the SST.

82 INSPECTION / REPAIR
03UOB2-082
13UOB2-0.
1
9MUOB2-112
I
03UOB2-08:
8. Measure the height @of each valve guide. Replace the
valve guide if necessary.
Height: 18.3-l 8.9mm (0.720-0.744 in)
Replacement of valve guide
Note
l The valve guides are different between intake and
exhaust sides, use the correct valve guide.
Removal
1. Remove the valve guide from the side opposite the com-
bustion chamber with the
SST.
Installation
1. Assemble the SST so that depth L is as specified.
Depth L: 18.3-18.9mm (0.720-0.744 in)
2. lighten the locknut.
3. Tap the valve guide in from the side opposite the combus-
tion chamber until the
SST contacts the cylinder head.
4. Verify that the valve guide height is within specification.
5. If not within specification, repeat Steps 1-4.
82-56

B2 INSPECTION / REPAIR
23UOB2-060
i$
03UOB2-08
ANGLE LIMIT
Ii
0311082.Ot
w v
05UOBX-138
03UOB2-OE
82-58
I8
9. Measure the protruding length (dimension L) of the valve
stem.
Dimension L: 45.0mm (1.7717 in)
(1) If L is 45.0-45.5mm (1.772-l .791 in), no correc-
tion needed.
(2) If L is 45.5-46.5mm (1.791-l .831 in), adjust with
washer on spring seat area of cylinder head.
(3) If L is 46.5mm (1.831 in) or more, replace cylinder
head.
Valve Spring
1. Inspect each valve spring for cracks or damage.
2. Measure the free length and out-of-square. Replace the
valve spring if necessary.
Free length
Standard: 46.26mm (1.821 in)
Minimum:
224-253 N (22.8-25.8 kg, 50-57 lb)/
395mm (1.555 in)
Out-of-square: 1.62mm (0.064 in) max.
CAMSHAFT
1. Set the front and rear journals on V-blocks.
2. Measure the camshaft runout. Replace the camshaft if
necessary.
Runout: 0.03mm (0.0012 in) max.
3. Inspect the camshaft for wear or damage. Replace the cam-
shaft if necessary.
4. Measure the cam lobe heights at the two points as shown.
Height
Standard
IN : 44.094mm (1.7360 in)
EX: 44.600mm (1.7560 in)
Minimum
IN : 43.894mm (1.7281 in)
EX: 44.400mm (1.7480 in)

B2 INSPECTION / REPAIR
r--
1
05UOBX-14
I -
L
05UOBX-149
82-60
(8) Measure the oil clearances.
Oil clearance:
0.035-0.081 mm (0.0014-0.0032 in)
Maximum: 0.15mm (0.006 in)
(9) If the oil clearance exceeds specification, replace the
cylinder head.
7. Measure the camshaft end play. If the end play exceeds
specification, replace the camshaft and/or the cylinder head.
End play : 0.07-0.19mm (0.0028-0.0075 in)
Maximum: 0.20mm (0.008 in)
HLA
Caution
l Do not attempt to repair the HLA.
1, Inspect the HLA friction surfaces for wear or damage. Re-
place the HLA if necessary.
2. Hold the bucket body and press the plunger by hand. If
the plunger moves, replace the HLA.
CYLINDER BLOCK
1. Inspect the cylinder block for the following. Repair or re-
place the cylinder block as necessary.
(1) ‘Leakage damage.
(2) Cracks.
(3j Scoring of wall.
2. Measure the distortion of the top surface of the cylinder block
in the six directions shown in the figure.
Distortion: 0.15mm (0.006 in) max.
3. If the distortion exceeds specification, repair by grinding’or
replace the cylinder block.
Height : 221 Smm (8.720 in)
Grinding: 0.20mm (0.008 in) max.

OSUOBX-1E
X
a3 Y
03UOB2-11
CRANKPIN
MAIN JOURNAL
OSUOBX-1
B2 INSPECTION / REPAIR
CRANKSHAFT
1. Check the journals and pins for damage, scoring, and oil
hole clogging.
2. Set the crankshaft on V-blocks.
3. Measure the crankshaft runout at the center journal.
Replace the crankshaft if necessary.
Runout: 0.04mm (0.0016 in) max.
4. Measure each journal diameter in X and Y directions at two
points.
Main journal
Diameter: 49.938-49.956mm (1.9661-l .9668 in)
Out-of-round: 0.05mm (0.0020 in) max.
Crankpin journal
Diameter: 44.940-44.956mm (1.7693-l .7699 in)
Out-of-round: 0.05mm (0.0020 in) max.
5. If the diameter is less than the minimum, grind the journals
to match an undersize bearing.
Undersize bearing:
0.25mm (0.010 in), OSOmm (0.020 in),
0.75mm (0.030 in)
Main journal diameter undersize
mm (in)
Bearing size Journal diameter
0.25 (0.010) undersize 49.704-49.708 (1.9568-l
.9570)
0.50 (0.020) undersize
49.454-49.458 (1.9470-l .9472)
0.75 (0.030) undersize 49.204-49.208
(1.9372-l .9373)
Crankpin journal diameter undersize mm (in)
Bearing size Journal diameter
0.25 (0.010) undersize 44.690-44.706
(1.7594-l .7601)
0.50 (0.020) undersize 44.440-44.456 (1.7496-l
.7502)
0.75 (0.030) undersize
44.190-44.206 (1.7398-l .7404)
05UOBX-166
BEARING
Main Bearing and Connecting Rod Bearing
1. Check the main bearings and the connecting rod bearings
for peeling, scoring, and other damage.
05UOBX-167
B2-64

B2 ASSEMBLY
CYLINDER BLOCK (INTERNAL PARTS)
Torque Specifications
12-18 N.m (1.2-1.8
JOURNALS AND
47-50 (4.8--/6.1, 35-37)
N-m (m-kg, ft-lb)
Connecting Rod
o5uoBx-175
1. Install one piston pin clip into the clip groove in the piston.
2. Assemble the piston and the connecting rod, a ligning the
oil groove in the large end of connecting rod opposite the
“F” mark on the piston.
3. Apply clean engine oil to the piston pin.
4. Install the piston pin from the side opposite the clip.
I 23uor32.039
82-68

B2 ASSEMBLY
- OWOBX-182
OWOBX-18
PLASTIGAGE
OSJOBX-18
5. Position the end gaps of the rings as shown in the figure.
Oil Jet
1. Install the oil jets.
Tightening torque:
12-l 8 N-m (1.2-l .8 m-kg, 104-l 58 in-lb)
Crankshaft
1. Before installing the crankshaft, inspect the main bearing
oil clearances as follows.
Oil clearance inspection
(1) Remove all foreign material and oil from the journals and
bearings.
Caution
l Install the grooved upper main bearings in the cyl-
inder block.
l Install the thrust bearings wlth the oil groove fac-
ing the crankshaft.
(2) Install the upper main bearings and thrust bearings.
(3) Set the crankshaft in the cylinder block.
Caution
l Do not rotate the crankshaft when measuring the
oil clearances.
(4) Position Plastigage atop the journals in the axial di-
rection.
(5) Install the lower main bearings and the main bearing
caps according to the cap number and * mark.
(6) Tighten the main bearing cap bolts in two or three steps
in the order shown in the figure.
Tightening torque:
54-59 N-m (5.5-8.0 m-kg, 40-43 ft-lb)
B2-70

B2 ASSEMBLY
RUBBER SLEEVE
I
OYJOBX-192
03UOB2-17
03UOB2-09 2 '0
05UOBX-196 Piston and Connecting Rod Assembly
Caution
l Protect the connecting rod bolts with rubber sleeves
to prevent damage to the crankpin journals.
1. Apply a liberal amount of clean engine oil to the cylinder
walls, pistons, and piston rings.
2. Check the piston rings for correct end gap alignment.
3. Insert each piston assembly into the cylinder block with the
F mark facing the front of the engine. Use a piston ring com-
pressor (commercially available).
Connecting Rod Cap
1. Measure the connecting rod bearing oil clearances using
the same procedure as for the main bearing oil clearance.
Caution
l Align the matching marks on the cap and the con-
netting rod when installing the connecting rod cap.
Tightening torque:
47-50 N-m (4.8-5.1 m-kg, 35-37 &lb)
Oil clearance: 0.028.0.088mm (0.001 l-0.0027 in)
Maximum: O.lOmm (0.004 in)
2. If the oil clearance exceeds the maximum, grind the crank-
shaft and use undersize bearings. (Refer to page 82-64.)
3. Measure the connecting rod side clearances.
Side clearance: 0.1 lo-0.282mm (0.0043-0.0103 in)
Maximum: 0.30mm (0.012 in)
4. If the clearance exceeds the maximum, replace the con-
necting rod and cap.