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Ferguson Tractor TO-20 Operation and Maintenance Manual

D ETA I LS O F TH E
Your Ferguson Tractor is pow-
ered by a four-cylinder, four-
cycle, wet sleeve engine. Its
bore is 3%
6
inches, stroke is
3� inches, piston displacement
120
cubic inches, and the com-
pression ratio is
6.1
to 1.
Your tractor is rated as a
2-14
inch plow tractor when used
with
Fex:guson hydraulically-
op er ate d
implements. B elt
horsepower is
26.50
maximum,
and 85% or 22.53 rated. Draw-
bar horsepower is
21.77
maxi-
mum and
75%
or
16.33
rated.
Crankshaft (A)
The drop-forged crankshaft,
both statically and dynamically
balanced to within �
inch-
ounces, is drilled for oil pres-
sure from main to connecting
rod bearings. It is supported by
three main bearings with re-
placeable liners. End thrust is .
taken by the front
main bearing.
Connecting Rods (B)
The forged steel connecting rods are balanced
so there is, at most, no more than � ounce varia-
tion in weight between any two of them.
Pistons (C)
Cam-ground aluminum alloy pistons are match-
ed with their respective sleeves at the factory-
are replaced as an assembly. Arrow on head indi-
cates correct placement of piston in cylinder-
should always point to front of engine.
Piston Rings (D)
There are three compression rings and one oil
control ring-all made of close-grained cast iron.
Top compression ring has beveled outer edge
nt
M
/
B
Right side
of
Ferguson Engine
and top inner side has 30
°
bevel. All rings are
stamped "top" for correct assembly and are not
interchangeable.
Piston Pins (E)
Full-floating type, made of cold drawn steel
tubing and secured at both ends by snap rings.-
Sleeves (F)
Sleeves are centrifugally cast of uniJormly
grained cast iron, easily pressed into position in
block. They are sealed against leakage at the bot-
tom by two neoprene rings. They project from
.002 to .005 inches above cylinder top so that the
bead and its gasket hold them securely in position.
Camshaft (G)
The cast alloy camshaft turns in three ground
bearings in the cast-iron engine block.