Service manual

11 B-60
463 ENGINE - Crankshaft, Flywheel and Drive Plate
Piston O.D. “A”
6EN0554
.ower bearing
Upper bearing
(for No. 1,2.4,5)
Upper and lower bearings
(for center)
1 EN027:
CYLINDER BORING
(1) Oversize pistons to be used should be determined on the
basis of the largest bore cylinder. .
Piston size identification ’
I
Size
I
Ideitification mark 1
0.25 mm (.Ol in.) O.S.
‘. 0.25
0.50 mm (.02 in.) O.S.
‘” 0.50
0.75 mm (.03 in.) O.S.
0.75
1.00 mm (.04 in.) O.S.
1 .oo
NOTE
Size mark is stamped on the piston top.
(2) Measure outside diameter of piston to be used. Measure it
in thrust direction as shown.
*
(3) Based on the measured piston O.D.; calculate the boring
finish dimension.
Boring finish dimension = Piston O.D. + (clearance
between piston O.D. and cylinder) - 0.02 mm (.OOOS in.)
(honing margin)
(4) Bore all cylinders to the calculated boiing finish dimension.
Caution
To prevent distortion that may
res -It from temperature
rise during honing, bore cylinders,
x1
the order of No. 2,
No. 4, No. 1 and No. 3.
(5) Hone to final finish dimension [pisGn 0-D. + clearance
between piston O.D. and cylinder.],-
(6) Check the clearance between pisto?r and cylinder.
Clearance between piston and cdinder:
0.01 -
0.03 mm (.0004 - .0012 in.)
NOTE
When boring cylinders, finish all of four cylinders to the same
oversize. Do not bore only one cylinder to an oversize.
INSTALLATION SERVICE POINTS
*A4 CRANKSHAFT BEARING INSTALLATION
(1) The upper bearings (on the cylinder block side) for Nos. 1,2,
4 and 5 journals are provided with oil groove.
(2) The lower bearings (on the cap side) for Nos. 1, 2, 4 and 5
journals are not provided with oil groove.
(3) The upper and lower bearings for No. 3 journal are common
parts which are flanged and are not provided with oil
groove.
TSB Revision
I