Volvo D20 - Page 7

$pecifications
CYLINDER BLOCK
Bore Mark i ng
Piston diameter Cylinder bore
mm
Standard ............ .. .. .. .................. 651 76 .48
652
76.49
653
76. 50
Oversize 1 ...................................
676 76.73
(0.25 mm = 0.010 in)
677 76.74
678 76.75
Oversize2 ...................................
701 76.98
(0.50 mm = 0.020 in)
702 76.99
703 77.00
Oversize
3 ....................
751 71.48
(1.00 mm = 0.040 in)
752
77.49
753 77.50
Mo< weaT dimension (compared
with normal diameter)
PISTONS
Weight (inel. gudgeon /piston pin) ............................................ .
Max
weight deviation between pistons in same engine .......... .
Overall height ............................................................................ .
Height
from gudgeon / piston pin center to piston crown ........ .
Piston
float, new ............................................ ... . .. ...................... .
max ........................................................................ .
Piston diameter, see
cylinder bare table
Wear di
mension, max (compared with normal diameter) ........
;n
mm
3.0110 76.51
3.0114 76.52
3.0118 76 . 53
3.0209 76.76
3.0212 76.71
3.0217 76.78
3.0307 71 . 01
3.0311 77.02
3.0315
77.03
3.0504
77.51
3.0508 77.52
3.0512 77 . 53
0.04 mm
455-465 grammes
12 grammes
71.7 mm
41.7 mm
0.03-0.05 mm
0.13 mm
0.04 mm
;n
3.0122
3.0125
3.0130
3.0220
3.0224
3.0228
3.0318
3.0322
3.0326
3.0515
3.0519
3.0523
0.016
in
2.8228 in
1.6417 in
0.0051 in
0.0016 in
Piston rings
Piston ring gap is measured
15 mm (0.6 in from lower
edge of cylinder).
Piston diameter is measured at
right an gles to gudgeon l
piston pin bore, 15 mm (0.6 in)
from lower edge.
o
Ring thickness ................... ................................................ mm
Side clearance
(measured
with ring on pisten), new ................................. mm
;n
max ................................ mm
Ring gap
(measured in cylinder, see fig.),
new ................................. mm
;n
max ... .. .. .. . .. .................... mm
Gudgeon/piston pins
Fit, in connecting rad ................. ... ......................................... .
in pisten .............................
.. ......................................... .. ... .. .
-~
~ t _ J
• ' >O . ..
Upper Lewer Oil seraper
compression
eompression ring
ring ring
1.730 1.980-1.990 2.975-2.990
0.0681 -0.0685 0.0780-0.0783 0.1171 -0.1171
0.06-0.09 0.05-0.08 0.03-0.06
0.0024-0.0035
0.0020-0.0031 0.0012-0.0024
0.2 0.2 0.15
0.0079 0.0079 0.0059
0.3-0.5 0.3-0.5 0.25-0.40
0.012-0.020 0.012-0 .020
0.0098- 0.0157
1.0 1.0
1.0
0.040
0.040 0.040
Light thumb pressure (close running fit)
Thumb pressure (push fit)
5