Repair Manual

10 - 43

ENGINE AND LOWER ENGINE UNITS

NOTE:

If wear of the connecting rods is noticed or if the parallelism of the shafts is not

correct, the connecting rods shall be corrected or replaced.

For the new connecting rods, a check shall be made so that they belong to the same

weight class (they shall not have the same colour marked on them).

PREPARATION OF THE PISTON SHAFT

Check if the piston shafts rotate freely in the

corresponding pistons.

Mount shaft on the mounting mandrel (1);

the pistons shaft shall freely rotate on the mandrel.

Mount the centering mandrel (2) on the

mounting mandrel (1).

Grease the mandrel-piston shaft assembly

with special grease containing MoS

PISTON – CONNECTING

Use an electric plate of 1500 W.

(electric oven)

Heat the crosshead end of the connecting

rod

in the furnace at a temperature of about 250°C

(10 – 15 minutes) in order to increase the bor-

ing of the connecting rod crosshead end by dila-

tation.

The temperature is checked by placing a piece

of tin (a) on the crosshead of the

connecting rods ; heat the connecting rods until

the tin melts.

On the piston head there is an arrow marked

which must be oriented towards the flywheel.On

the oposite side of the piston there is a bladed

item on which the piston lay when the piston shaft

is mounted.

ROD PISTON SHAFT ASSEMBLY

DISMOUNTING – MOUNTING

vnx.su