Repair Manual

10
10 - 44
ENGINE AND LOWER ENGINE UNITS
When assembling the piston with the connecting rod,the following instructions are to be
observed:
- place the piston with the bladed item on the bushing (B) of the piston shaft mounting device;in
this situation the arrow on the piston head shall be upwards oriented;
- place the connecting rod on the piston with the marking or with the slots for bushings oriented
towards the right side of the worker; in this situation when mounting the assembly in the block
the arrow shall be oriented towards the flywheel and the marking on the connecting rod will be
on the opposite side of the camshaft.
NOTE: The following operations are to be performed very quickly to avoid the
connecting rod cooling.
When the connecting rods reached the tem-
perature of 250 °C ( the tin is melted):
- remove the tin from the crosshead end
of the connecting rod;
- place the connecting rod in the piston
observing the positioning indications of the latter;
- quickly introduce the mounting mandrel
(1) with the piston shaft until the
latter comes into contact with the bottom of the
support bushing;
- dismount the chuck from the piston shaft;
check if the piston shaft remains retracted as to
the piston disregard of the connecting rod position.
NOTE: On the bottom of the support bushing shall be placed a 1,5 mm.
Mount on the piston:
- the lubricating ring;
- the sealing rin with the marking “ TOP “
towards the piston head;
- the compression ring.
Abundantly lubricate with fresh oil the rings
and the piston;
Displace t he rings s lots at 120
0
; the slot of
the lubricating ring shall be obligatory on the side
of a fill of its channel and at 90 º as to the piston
shaft.
ASSEMBLING SET MOTOR
DISMOUNTING - MOUNTING
vnx.su