Group 21 Reconditioning engine
Clesning, inspection
1312011
o
fl
1
31310
24
G3
Measure cylinder bores
Use an accurate bore
gauge
(range = SO-100
mm
or
2-4
in).
Measure
max
wear
crosswise just
below
top dead centre.
Measura
min
wear
lengthwise at bottom dead centre.
C4
Identificatlon
A letter is stamped into block next to each cylinder. (C, D, E
or
G).
Oversizes are indicated
by
001
(051)
or
002
(052).
Afler
reboring, punch in new size
(mar1<:).
Standard
B 17, B 19 B
21
(C-mar1<.ed)
mm 88.
90·88
.
91
92.00-92.
01
(in)
(3
.500-3.5004)
(3
.6220-
(O-marked)
mm 88.91-88.92
(in) (3.5004-
3.5008)
(E-mar1<:ed)
mm
88.92-88.93
(in)
(3
.5008-
3.5012)
(G-marked)
mm 88.
94-88
.95
(in)
(3
.5016-
Oversizes:
OSlmm
(in)
OS2mm
(in)
3.S(19)
69.29-69.
30
(3.5153-
3.5157)
89.67-69.68
(3.5303-
3.5307)
3.6224)
92.01-92.02
(3.6224-
3.6228)
92.02-92.
03
(3
.6228-
3.6232)
92.04-92.
05
(3.6236-
3.6240)
92.5
(3.64)
93.0
(3.66)
Measure piston diameter
823
96.00-96.
01
(3
.7795-
3.7199)
96.01-96.02
(3.7799-
3.7803)
96.02-96.03
(3.7803-
3.7807)
96
.04-96.05
(3.7611-
3.7615)
96.3
(3.79)
96.6
(3.80)
G5
Measure diameter at right anglas to gudgeon (piston) pin.
Diameter must
be
measured at different points depending
on piston/engine type.
• B
21
NE
_ 6
mm
(0.24 in) from botlom edge of skirt
• B 23 type l (piston siza
BO.4
mm or 3.17 in) = 15
mm
(0.59 in) from botlom edge
• B 23 type 2 (A,
E,
and
Fl
(pisten size 76.4
mm
or 3.01 in)
_ Bmm (0.31 in) in from botlom
OOge
•
Otllers
_
7mm
(0.28 in) from botlem edge
G6
Calculate piston clearance In cylinder
Example:
Measure bore min 92.02
mm
(3.6228 in)
Measure pisten diameter 92.00
mm
(3.6220 in)
Clearance
Piston clearance:
0.
02
mm
to
(O.oooe in)
max
92.03
mm
(3.6232 in)
92.
00
mm
(3.6220 in)
0.03
mm
(0.00
12
in)
B
17
A, B
19
NE/K, B
21
NE/F
..
0.01-0.04
mm
(0
.0004-0.0016 in)
B
19
ET
..........................
.
0.03-0.06
mm
(0.0012-0.0023 in)
B
21
ET & FT . . . . . . . .
..
.
.....
0.02-0.04
mm
(0
.0008-0.0016 in)
B 23 A
............
.
...
0.01-0.04
mm
(0.0004-0.0016 in)
B 23 E
type l (piston size
BO.4
mm 3.17 in) 0.05-0.07
mm
(0
.0019-0.0028 in)
type
2 (pisten size 76.4
mm
3.
01
in) 0.01-0.04
mm
(0.0004-0.0016 in)
B 23 F
......
.
......................
0.01-0.04
mm
(0.0004-0
.0016 in)
•
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