Camshaft; Governor Tie Rod Adjustment - Kohler KD 425-2 Workshop Manual

66
67
68
69
KD 425-2 Workshop Manual_cod. ED0053029360_1° ed_ rev. 00

Camshaft

Prepare the camshaft assembly (fig.66) as described below:
1. Fit adjustment shim (nr. 3) and governor washer (nr. 4) onto the
camshaft.
2. Fit snap ring (nr. 5) and key (nr. 7) into their respective seats.
3. Preheat (180 ÷ 200 °C) gear (nr. 6) complete with flyweights
and mount it to the camshaft, making sure that it is snugly fitted
against the retaining ring.
4. Insert the governor driving plate retaining ring (nr. 2).
The speed governor is of the centrifugal type with flyweights keyed
directly onto the end of the camshaft gear (fig.67).
Flyweights (A) impelled outward by centrifugal force, cause a moving
plate (P) to shift axially. The plate operates a lever (R) which is con-
nected, through tie rods (T) to the control sleeves (E) of the injection
pumps.
Spring (N) placed under tension by speed control lever (C), contrasts
the action of the centrifugal force of the governor.
The balance between the two forces keeps the engine speed virtually
constant with respect to load variations.

Governor tie rod adjustment

The length of the tie rod, measured between the centredistance of
holes (X, fig. 67), must be:
mm 36,5 ± 1
The accuracy of this setting will serve to eliminate hunting
of engine speed, difficulty in starting, and power fall-off.
Assembly
1. Fit the tappets into their housings in the crankcase
2. Fit the governor lever and tie rod, simultaneously with the
camshaft, into the crankcase (fig.68)
3. Insert the governor lever fulcrum pin from the outside of the cran-
kcase and secure it with the relative screw (fig.68).
The lever must be free to effect its full stroke without sticking.
4. Insert the spring between the governor lever and the accelerator,
making sure that it is correctly installed.
5. Check that the timing marks on the camshaft and crankshaft ge-
ars are correctly aligned with respect to each other (fig. 69).
ENGINE ASSEMBLY
turn
XIII
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