Robin
850
Workshop
Manual
Supplement
The engine
Operation
13-
Camshaft removal
and installation
(with
timing
chain
and sprocket removed)
Removal
1 Remove engine
asse
mbly (see
Operation
1 ) .
2 Unscrew
two
nuts and
lift
off
the rocker
cover and
sealing gasket.
3 Remove
four
nuts and washers from the
rocker shaft support bracket and remove the
complete rocker assembly.
4 Withdraw the eight push rods keeping
them in their correct order.
& Remove cylinder head and distributor.
6 Remove sump (see Operation
3)
.
7 Remove
two
nuts, complete
with
lockwasher
s,
and remove the oil
pump
assembly, complete
with
filter, from
the
cylinder block.
8 Knock out the pin securing the thrust muff
to the distributor and
oil pump driveshaft
which
can then be removed upwards through
the distributor aperture.
9 Remove the
two
bolts, and lockwasher
s,
securing the camshaft retaining plate.
10
Unscrew three nuts and washers and
remove the front engine mounting
plate from
the
cylinder block, including the gasket.
11
Lift
the tappets up through the cylinder
block
and carefully withdraw the camshaft.
To
replace
Replace in reverse order, fitting new gaskets
where
applicable.
15
Note:
When refitting the distributor driveshaft
ensure the
large 'D'
of
the driving gear offset
dog
is
facing towards the block at
No
. 1
piston. i.e.
slot in a
'5
minutes past 7 o'clock'
position.
Take the opportunity
of
checking the
ca
mshaft
end-float,
which
should be
within
0·
064
-
0·
16mm
(0
·
0025-0
·0065in). Pull the camshaft
out against the retaining
plate. and insert a
feeler gauge between the groove and the
retaining
plate. Reduce the end-float by fitting
a new retaining
plate. The camshaft retaining
plate, fitted
as
original equipment, is 4·
621
mm
(0·182in)
thick. A service plate 5·
258mm
(0
·207 in) thick is available
to
counteract any
end-float, but
it
may,
of
course, be necessary
to
reduce this thickness
to
give correct
end-float, dependent on amount
of
wear.
Operation
14
- Camshaft bearing
removal and replacement
(with
· camshaft removed)
Removal
1 Remove flywheel (see Operation
2)
.
2 Unscrew four set
sc
rews and remove the
rear engine
plate from the cylinder block.
3 Drill a hole in the camshaft core plug and
prise from the
cylinder block.
Figure
17
Camshaft bearing removal 1 Horseshoe 3 Small
·o
· washer
4
Mandrel
5 P
ilot
and replacement tool 2 Large
·o·
washer
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