Ford Corsar Repair Manual page 84

CYLINDER BLOCK
1 ~ ~ 2 4 ~ 1
Inspection (Cont'd)
X
Y
Taper : A
-
B
Out-of-round : X
-
Y
S E M 3 1 6 A
3. Measure piston skirt diameter.
Piston diameter "A" :
Refer to S.D.S.
Measuring point "a" (Distance from the top):
Approximately 52 mm (2.05 in)
4. Check that piston-to-bore clearance is within specification.
Piston-to-bore clearance "B":
0.020
-
0.040 mm (0.0008
-
0.0016 in)
5. Determine piston oversize according to amount of cylinder
wear.
Oversize pistons are available for service. Refer to S.D.S.
6. Cylinder bore size is determined by adding piston-to-bore
clearance to piston diameter "A".
Rebored size calculation:
D = A + B - C
where,
D: Bored diameter
A: Piston diameter as measured
B: Piston-to-bore clearance
C: Honing allowance 0.02 mm (0.0008 in)
7. Install main bearing caps, and tighten to the specified torque
to prevent distortion of cylinder bores in final assembly.
8. Cut cylinder bores.
When any cylinder needs boring, all other cylinders must
also be bored.
Do not cut too much out of cylinder bore at a time. Cut
only 0.05 mm (0.0020 in) or so in diameter at a time.
9. Hone cylinders to obtain specified piston-to-bore clearance.
10. Measure finished cylinder bore for out-of-round and taper.
Measurement should be done after cylinder bore cools
down.
CRANKSHAFT
1. Check crankshaft main and pin journals for score, wear or
cracks.
2. With a micrometer, measure journals for taper and out-of-
round.
Out-of-round (X-Y):
Main journal Less than 0.01 mm (0.0004 in)
Crank pin Less than 0.005 mm (0.0002 in)
Taper (A-B):
Main journal Less than 0.01 mm (0.0004 in)
Crank pin Less than 0.005 mm (0.0002 in)
3. Measure crankshaft runout.
Runout (Total indicator reading):
Less than 0.10 mm (0.0039 in)