Chapter 3 Governors And Linkage; General Information - Tecumseh VLV Technician's Handbook

General Information

All Tecumseh 4-cycle engines of recent manufacture are
equipped with mechanical type governors. As the
speed of an engine increases, centrifugal force moves
the weights outward, lifting up the governor spool which
contacts the governor shaft; this in turn closes the
throttle. As engine speed decreases, the weights are
pulled inward by the spring which opens the throttle.
Thus, the engine speed controls the throttle opening
and maintains a certain governed speed.
Center Force Governor
The governor gear on this engine is driven by the
crankshaft through an idler gear as shown below.
Idler Gear
695578
Chapter 3
Governors and Linkage
Retaining
Ring
Gear Ass'y.
(Gov.)
NOTE: Gear assembly must have .010 - .020 (.254 - .50 mm) end
play after shaft is installed into flange.
TYPE II governors do not use governor retainer clips.
The spool is retained by a raised upset on the shaft.
press. The pressure from the press could cause
parts to fly out with great force. Inadequate
safety precautions could result in death or serious
injury.
The governor shaft is pressed into the flange or cover to
a specific dimension as shown below.
Type I
Spool
Washer
Idler Gear
Wear eye protection and verify
WARNING
setup is stable when using a
Governor Shaft
Idler Shaft
VLV Type II
Spool
Upset
Retainer
Shaft
Gear Ass'y.
(Gov.)
Washer
Press Depth
1.319 (33.5 mm)
1.334 (33.9 mm)
3-1