Lubrication Systems; Counterbalance Systems - Tecumseh ECV105 Technician's Handbook

LUBRICATION SYSTEMS

The lubrication system used with all Tecumseh horizontal
crankshaft engines covered in this manual utilize a splash
type system. An oil dipper on the connecting rod splashes
oil in the crankcase to lubricate all internal moving parts.
Some engines have the dipper as an integral part of the
connecting rod assembly, while others have a dipper that
is bolted on with one of the rod bolts (diag. 5).
All vertical shaft engines use a positive displacement
plunger oil pump or rotary type oil pump. Oil is pumped
from the bottom of the crankcase, up through the
camshaft and over to the top main bearing. Oil under
pressure lubricates the top crankshaft main bearing and
camshaft upper bearing (diag. 6).
On all Tecumseh vertical shaft 4-cycle engines, the oil is
sprayed out under pressure through a small hole between
the top camshaft and crankshaft bearing to lubricate the
piston, connecting rod, and other internal parts (diag. 7).
The plunger style oil pump is located on an eccentric on
the camshaft. As the camshaft rotates, the eccentric
moves the barrel back and forth on the plunger forcing
oil through the hole in the center of the camshaft. The
ball on the end of the plunger is anchored in a recess in
the cylinder cover (diag. 8).
OIL DRAIN
HOLE

COUNTERBALANCE SYSTEMS

Some Tecumseh engines may be equipped with an Ultra-
Balance ® counterbalance system. This system uses a
single weighted shaft that is driven off the crankshaft.
The shaft's function is to counteract the imbalance caused
by the counterweights on the crankshaft and the
combustion forces (diag. 9).
SPRAY
MIST HOLE
7
DIPPER
SPRAY
MIST HOLE
CRANKSHAFT
PASSAGE
PLUG
CAMSHAFT
DRILLED
CAMSHAFT
PASSAGE
DRIVE GEAR
CAMSHAFT
5
MAIN BEARING OIL
GROOVE
CRANKSHAFT
OIL PASSAGE
CURRENT
(TVM195, 220)
BARREL TYPE
LUBRICATION
PUMP
6
ASSEMBLE PUMP BARREL
WITH INSIDE CHAMFER
TOWARD CAMSHAFT GEAR
8
COUNTERBALANCE
SHAFT
GOVERNOR
FLANGE
9
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