Craftsman 143.991200 Specifications download pdf (Page 62)

FLANGE

COUNTER-

BALANCE

SHAFT

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. The oil dipper is

either bolted on or may be cast on to the cap with one

of the rod bolts (diag. 6).

All vertical shaft engines use a positive displacement

plunger oil pump or a rotary 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. 7). A crankshaft

drilling also provides oil to the crankpin journal on

engine models OHV 13.5 -16.5.

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. 5).

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 flange (diag. 8).

The rotary pump is driven by the camshaft. It uses a

lobed gear in a rotating ring to provide positive oil

displacement (diag. 9).

CAMSHAFT

GOVERNOR

OIL

DRAIN

HOLE

SPRAY

MIST 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. This shaft's function is to counteract the

imbalance caused by the counterweights on the

crankshaft (diag. 10).

A dual shaft counterbalance is also used on some

engine models. A gear on the crankshaft drives the

counterbalance with the thicker gear, which in turn

drives the second counter balance shaft. For timing

of either counterbalance system, see " Engine

Assembly Procedure " in the Service section of this

chapter.

DIPPER

CAMSHAFT

DRILLED

CAMSHAFT

PASSAGE

PLUG

BARREL TYPE

LUBRICATION

PUMP

CRANKSHAFT

OIL PASSAGE

CRANKSHAFT

PASSAGE

MAIN BEARING

OIL GROOVE

SPRAY

MIST HOLE

FLAT

ASSEMBLE PUMP HOUSING

WITH INSIDE CHAMFER

TOWARD CAMSHAFT GEAR

NOTE: INSTALL OIL PUMP AFTER THE SUMP IS ON

DRIVE

GEAR

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Craftsman 143.991200 Specifications Page 62

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