Lubrication System; Oil Pump - Tecumseh VLV Technician's Handbook

Lubrication System

All Tecumseh Vertical shaft 4-Cycle engines use a
positive displacement plunger oil pump to pump oil from
the crankcase, up through the camshaft to a passage
in the breather box to the top crankshaft main bearing.
From Camshaft
Oil Passage
Oil is pressure sprayed out of a small hole between the
crankshaft and ultra-balance bearing, to lubricate the
connecting rod journal area. If a heavy leakage is noted
from the breather cover, check for plugged mist hole.
Breather Oil Return Hole
Oil Drain Hole
Spray Mist Hole
695578
Oil Mist Hole
Main Bearing Lube Hole

Oil Pump

An eccentric on the camshaft works the plunger in the
barrel back and forth, forcing oil up the center of the
camshaft. A ball on the end of the plunger locates in a
recess in the flange cover.
When installing oil pump, make certain the chamfered
side of the pump barrel faces the camshaft, and the
plunger ball seats in the recess of the flange cover.
Chamfer Up
This engine has a top mounted integral breather.
Oil Return
Filter Element
Breather Check Valve
NOTE
Breather Tube
10-2