Lombardini CHD series - Connecting Rod and Main Bearings; Connecting rod; Connecting rod weights; Connecting rod and piston pin

- 40 - Workshop Manual LDW CHD _ cod. 1.5302.345 - 6° ed_rev. 05
LDW 1503
1603
LDW 2004
2004/T
2204
2204/T
LDW
1503-2004-2004/T
LDW
1603-2204-2204/T
LDW
2004/T-2204/T
LDW
1503-1603
2004-2204
4
64
62
60
59
61
63
Tighteningmustbecarriedoutasshowningure59.
Oncethenaltorque50Nmisreached,waitthirtyminutesbefore
manually rotating the engine to verify that the pistons do not collide
with the valves, if the engine turns freely start the engine normally,
otherwise wait another 30 minutes before repeating the operation.
At rst start-up the engine may run irregularly until all the air
contained in the tappets has been drained.
Disassembly / Reassembly
Connecting rod and piston pin
The connecting rod big end shell bearings are supplied in either
standard or with this value decreased by 0.25 and 0.50 mm
respectively.
Important
The fastening screws must be tightened by hand until the
beginning of the tightening stage and then pre-tightened to
10÷15 Nm.
 Final tightening is to 70 Nm.
Connecting rod weights
Connecting rod, piston and piston pin can also be weighed in
a preassembled state but the difference in weigt should not
exceed 14 g in order to avoid unbalance.
Connecting rod
Important
When remounting the big-end bearings, remember to
thoroughly clean the parts and generously lubricate them to
prevent seizure when the engine is started up for the rst
time.
Remove oil pan and oil pump suction pipe.
Disconnect the connecting rod from the engine shaft and
perform the subsequent checks.
When retting both centering notches A and B should be
located on the same side.
 Tighten the connecting rod big end bolts to 70 Nm.