I
15152
~
360/460
510
360/460
510
DIM.
mm
In
mm
In
DIM
mm
In
mm
in
A
2,58
.1015
2,58 .1015
L
5,478
.2156
4,943
.1946
2,60
.1023 2,60
.1023
5,490 .2161 4,956
.1951
B
2.54 .1000
2.54
.1000
M 31,983 1.2592 31,983
1.2592
2,56
.1008
;!.56
.1008 31,990
1.2594 31,990
1.2594
c 5,53
.2177
4.99 .1964
N 0,35 .014
0.35
.014
5,55
.2185
5,01 .1972 0,55
.022
0,55 .022
D 31,983
1.2592 31,983
1.2592
p
0,30 .012
0.30
.012
31,990
1.2594
31,990
1.2594
0,45 .018 0,45 .018
E 94.842
3.7339 101,772
4.0068
A
0,25
.010
0,25
.010
94.866 3.7369
101.796
4.0077
0,40
.016
0.40
.016
F
94,894
3.7359 101,824
... 0088
s 3,08
.1212
3.08
.1212
94.918
3.7369 101,848 4.0098 3,32 .1307
3,32
.1307
G 50 1.9685
50
1.9685
H 3,48
.137
3.48
.137
3.72
.146
3,72 .146
J
2,478
.0975 2,478
.0975
2,490
.0980 2,490
.0980
K 3,56
.1402
3.56
1.402
3.80 .1496
3,80 1.496
FIG. A.lll/8 DIMENSIONS OF STANDARD SIZE PISTONS AND OF THEIR PINS AND RINGS
X
= Major dia. at
50
mm. from skirt; Y = Major dia. at base
of
skirt; Z = Measurement
to
be taken
with
rings
installed
inside cylinder lines.
NOTE: The tolerance
of
0.024 mm. on dia. X is subdivided
into
two classes A and
Beach
with
a tolerance
of
0.0012.
See
the table
of
"Fits
and Tolerances".)
The piston class
"A"
and
weight
"B"
data are
..-------------------,
stamped on the
piston
top surface (Fig. A.lll/10).
Remove
pistons
as follows:
1.
Remove
the
front axle and
complete
as in·
dicated on page 108 in Power Train Section.
2.
Remove the
cylinder
head as indicated on
page
12.
3.
Remove the
oil
sump as indicated on page
14.
4.
Remove the
oil
pump.
5.
Remove the self-locking screws (Item
Cz,
Fig.
A.lll/1),
which
secure the
connecting
rod
bearing caps after rotating
the
shaft.
6.
Push
the
piston
up in
the
crankcase paying
attention
not
to
score the
cylinder
liners
with
the
connecting
rod end.
Clean the
pistons
by scraping
off
all
combustion
deposits
and wash them
with
solvent.
Calculate
piston
wear by measuring
their
diameter
at
skirt
base and at
50
mm. (approx·
imately
2 in.)
off
(Fig. A.lll/9). Find then the
dif·
terence between the measures taken on cylinder
14019
FIG. A.lll/7 CHECKING THE CRANKSHAFT END
FLOAT
(Arrows indicate assembly marks
to
be lined up
at
main bearing cap assembly.)
Engine·
26
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