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Chapter 3
Governors and Linkage
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.
The governor gear on this engine is driven by the
crankshaft through an idler gear as shown below.
VLV Type II
Type I
TYPE II governors do not use governor retainer clips.
The spool is retained by a raised upset on the shaft.
Wear eye protection and verify
setup is stable when using a
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.
NOTE: Gear assembly must have .010 - .020 (.254 - .50 mm) end
play after shaft is installed into flange.
Press Depth
1.319 (33.5 mm)
1.334 (33.9 mm)
Idler Shaft
Governor Shaft
Idler Gear
Washer
Gear Ass'y.
(Gov.)
Shaft
Spool
Idler Gear
Retaining
Ring
Center Force Governor
Upset
Retainer
Spool
Gear Ass'y.
(Gov.)
Washer
WARNING
3-1
