ENGINE
CONSTRUCTION - The engine is a heavy duty, 4 cylinder, valve in head,
wet
sleeve
motor with a pressure oiling
syst
em as described in detail on page 12.
A
water
pump is used with a full flow by-pass
thermostat
to insure consta
nt
motor
temperature
which is so imp
ortant
in securing long life from
the
wear
ing
parts
. All working
parts
are
protected by the
larg
e capacity oil filt
er
used,
the
heavy
duty
air
cleaner,
and
the careful sealing of the main bearings
at
the front
and
rear
of
the
crankshaft
.
The
high
quality variable speed governor provides constant engine speed control.
The main connecting rod bearings
are
of
high
precision, interchangeable, steel-
backed
babbit
design.
SERVICE -
It
is strongly recommended
that,
should
any
work have to be done on
the
motor, it be taken to your dealer. You
I'
deal
er
has
the
proper facilities and
the
trained
personnel to give your
tractor
th
e efficient
attention
that
it deserves.
16
Operating Instructions for Cockshutt "30" Tractor
•
•
•
VALVE ADruSTMENT
3
[J
~~i
?£P
P
;
LA
T
E
No.
C·21
-46
VALVE
TAPPET
AD
JUS
TMENT
PLATE
No. C-21-t6
Every
400 hours
or
once a year,
it
is recommended
that
a compet
ent
mechanic check the
tappet
clear-
ance. A clearance of
.009" is necessary between end
of rock
er
arm
s and valve stems when valves
are
closed
and
the engine is warm.
(1)
Before checking valve clearance, make sure
ignition switch is off. This elimina
tes
d
ang
er
of accidently
starting
the engine.
(2) Remove valve cover.
• •
(3) Crank
the
engine slowly, watching
No.4
cylinder valves. When
the
exha
ust
valve is
just
closed and
the
intake valve is
just
starting
to open, No
.1
cyli
nder
is
at
top dead
centre on the compression stroke
-
and
both valves
are
closed.
(4) Loosen the lock n
ut
as indicated by
arrow
(1)
and
adjust
screw as indicated by
arrow
(2) in rocker
arm
so
that
a .009" feel
er
gauge as indicated by
arrow
(3) slips
snugly between end of rocker
arm
and
the
valve
st
em.
(5) Tighten lock
nut
and recheck clearance. Check both intake
and
exhaust valves on cyl-
inder.
,
(6) Crank engine
1f2
revolution
at
a
tim
e
and
check clearance of each cylind
er's
valves
and
adjust
as
instructed above. Do
this
on each set of cylinder valves in succession
according to
the
firing
order
of
the
engin
e, which is 1, 3, 4, 2, as shown on Plate No.
C-20-46 on page 26.
(7) Replace valve cover. Check to make
sure
the valve cov
er
gasket makes an oil-tight seal
with
the
cylinder head. Replace the
gasket,
if necessary,
with
a new one.
• •
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