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486 PL ENGINE
P
Crank Shaft (Dimensions) :
Stage Crank case main
Crank shaft
bearing bore
main bearing
diameter with
journal
bearing shell
diameter
mm
mm
Normal
Grade
I
60.046-60.085 60
-0.010
(59.990-60.000)
Grade
II
60.046-60.085 60
-0.020
(59.980-59.990)
Normal
I
Grade
I
59.944-59.983 59.9
-0.010
(59.890-59.900)
Grade
II
59.944-59.983 59.9
-0.020
(59.880-59.890)
Fig. 184
REPAIR ADJUSTMENT DATA
Cylinder Block (Dimensions) -
Fig. 184
H
eight of crank case
(Dimension A & B)
304+0.1 mm
C
rankshaft axis from
crankcase top surface 236.380/236.300 mm
(above dimension with
MB caps and front
cover installed
M
aximum permissible Length wise 'C' 0.030 mm
unevenness of crank Cross wise 'D' 0.015 mm
case mating surface
with cylinder head
Piston & piston bore sizes :
Stage
Cylinder bore Piston stamped
diameter
diameter
mm
mm
Grade A
86 ± 0.005
85.960
Grade B 86.010 ± 0.005
85.970
Grade C 86.020 ± 0.005
85.980
Piston to bore clearance
0.030/0.050mm
(0.040 + 0.010mm)
Piston rings :
Max Lateral Butt
Type
Ring Clearance clearance
of ring
thickness in piston in cylinder
groove bore
mm mm mm
1st
1.5-0.010 0.080 0.2-0.4
Compression -0.030
2nd
1.5-0.010 0.060 0.5-0.7
Compression -0.030
3rd
3-0.010 0.060 0.2-0.5
Oil control
-0.030
Piston cooling nozzle :
l
Nozzle opening pressure 2.7/3.2 bar
l
Jet height at pressure of 144 mm
2.9/3.5 bar.
l
Flow rate with SAE - 30 1.2 / 0.8 lpm.
oil at 40
o
C & @ 4bar.
B
D
A
C
-0.010
-0.010