Robin 850
Workshop
Manual
Supplement
The engine
4 Refit spark plugs, connecting HT leads in
correct sequence.
& Refit rocker cover, renewing gasket
if
necessary, and secure with nuts and washers;
tighten
to
a torque
of
0·
14
to
0·
3kgm
(1
to
21bft).
Alternatively, the valve clearances and tappets
can
be
adjusted, using general tool
No. 6500A (s
ee
Figure
29
}.
Stud removal
Damaged studs can be removed using
extractor
tool, part number 450A, in
conjunction
with
the tappet adjustment
wrench,
general tool part number 6500A.
as
shown in
Figure
30
.
Engine specification
CyllnderhMCI
Material
Joint
washer thickness
Cylinder
block
Material
Crankahaft
Material
Main bearing journals
Crankpin journals
End
-float
Crankshaft
regrinding size
Figure
30
Stud removal tool
Aluminium alloy
1·02mm (0·
040in)
Aluminium alloy
with
cast iron liners
Forged high tensile steel
50
·787-50·
800mm
(1·995-2·
00in)
.33·32-33·33mm
(1
·3120-1·3125in}
0·
0764mm
(0·
003in)
min.
0·279mm (0·
011
in)
max
.
1st undersize
0·254mm
(0
·
010in}
Main bearing journals
50
·533-
50
·
546mm
(1
·988-1·989in}
Crankpin journals
33
·07-33·08mm
(1
·3020-1·3025in}
2nd undersize 0·508mm (0·020in}
Main bearing journals
50
·279-50·292mm
(1
·978-1 ·979in)
Crankpin journals 32·
81
-32·82mm
(1
·2920-1 ·2925in}
3rd undersize 1·016 mm (0·
040
in}
Main bearing
journals 49·771-49·784mm (1·959-1·960in)
Crankpin journals 32·
31
-32·32mm
(1
·2720-1·2725in}
Note:
Connecting rod, big end bearing shells
are
available
to
suit crankshafts reground
to
the
above
sizes
.
Crankshaft
thrust
washer
seta
Oversize sets available
Platona
Material
Size
All lands
At
skirt
0·0635 mm (0·0025 in)
0·1270mm (0·
0050in)
0·1905mm
(0
·
0075in)
0·
254mm
(0
·
010in)
Low expansion aluminium alloy
62·53
mm (2·462 in)
62·
17
-62·26mm (2·448-2·
451
in}
62·47 -62·
50
mm
(2·459-2·638 in}
21
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