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25 LD 330-2_425-2 Workshop Manual_cod. ED0053031690_1° ed_ rev. 00
59
Engine assembly
Important
• 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.
Preparing the crankcase
Clean the mating surfaces of sealing compound residues or
other foreign material using a copper scraper or fine emery
stone. Make sure that the oil passages are open and free of
built-up deposits.
1. Fit the plugs (A, fig.55) in their holes.
2.Insert the internal accelerator lever (B, fig.55) into the
crankcase with its spring taking care to protect the oil seal
O-ring from damage.
Complete the external assembly with plate, spring, lever,
etc. as shown in figure 55.
3. Mount the bearing bush (gear train side) using either a
standard press or a made-to-measure punch as shown
in figure 56. Fit the bush by matching the hole with the
passage on the crankcase. Bushes with standard or smaller
internal diameters can be ordered as required.
4. Insert the complete oil pressure relief valve (A, fig. 57) into
its housing (C, fig.57). Make sure that the valve ball seat
is free of dirt that could reduce the effectiveness of the
pressure seal.
Secure the oil pressure valve with the relative screw (B, fig.
57).
5. Insert the cylinder studs and the centring pins.
Important
• A warped oil retainer may allow the introduction of air into the
engine thus causing crankcase ventilation problems.
• Use genuine oil retainers
Central main bearings
Fit the shells into their seats and coat with a thin film of oil.
The reference numbers (fig.58) must be aligned on each
half-shell, making sure that the oil passages match the
corresponding openings in the crankcase. Torque the bearing
assembly bolts (fig. 59) to:
kgm 2,2 (Nm 21,6)
7
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