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KD 477-2 Workshop Manual_cod. ED0053029370_
1° ed
_ rev.
00
49
50
51
52
XII
Notice: These instructions are valid for engines up-dated
prior to the publication of this manual. Any modifications
must be checked on the technical circulars.
Before assembling the engine carefully clean all parts and
dry them with compressed air. Lubricate moving parts to
prevent seizing when starting up. Replace the gaskets with
new ones each time the engine is assembled.
Use torque wrenches to ensure that the correct tightening
torques are applied.
Preparation of crankcase
Clean support faces and remove seal residue and dirt with a copper
plate or a fine emery stone to avoid damage to the contact surfaces
(fig. 49).
Lower crankcase (fig. 50)
1
. Insert plugs (A) into relative seats.
2
. Screw in oil filter cartridge connection (B). The connection should
protude 11 to 13 mm. from the crankcase.
3
. Insert complete oil pressure register valve into its seat (C).
Make sure the seat of the valve ball in the casing is free of dirt or
scores which could jeopardize the pressure seal.
4
. Insert cylinder studs and centering pins.
Camshaft preparation
To prepare the camshaft unit (fig. 51) proceed as follows:
1
. Insert shim adjustment washer (No 3) and governor plate (No 4)
on camshaft.
2
. Fit snap ring (No 5) and tab (No 7) into respective housings.
3
. Heat gear (No 6) complete with masses and insert onto camshaft
making sure it rests against the locking snap ring.
4
. Insert governor plate locking ring (No 2).
The speed governor is of the centrifugal mass type
splined di-
rectly onto the ends of the camshaft gear (fig. 52).
Masses (
A
), pushed outwards by the centrifugal force, shift mobile
plate (
P
) axially. Said plate actions lever (
R
) connected to injection
pump rack bar (
E
) by means of tie rod (
T
).
A spring (
N
) placed under tension by the accelerator (
C
), contrasts
the action of the centrifugal force of the governor.
The balance between the two forces keeps the revolutions practically
constant when load is changed.
For pre-load adjustment of the speed governor see paragraph on
page 40 "Injection pump tie rod connection".
ENGINE ASSEMBLY
