WORKSHOP MANUAL - lombardini service
WORKSHOP MANUAL - lombardini service
WORKSHOP MANUAL - lombardini service
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4<br />
Disassembly / Reassembly<br />
CONNECTING ROD<br />
Caution – Warning<br />
While reassembling the big end bearings, we suggest cleaning<br />
all parts thoroughly, as well as proper greasing in order to<br />
avoid risks of seizure at the first start.<br />
Big end bearing<br />
97<br />
After connecting rod from crankshaft disconnection, check the<br />
following.<br />
While reassembling, be sure the two centring notches A an B are<br />
on the same side.<br />
Tighten the connecting rod big end cap screws simultaneously at<br />
a torque of 40 Nm.<br />
Note: The big end bearing is supplied both at the nominal value<br />
and undersized by 0.25 and 0.50 mm.<br />
Connecting rod, weight<br />
Weigh connecting rods when replacing them in order to avoid<br />
unbalance.<br />
The difference in weight should not exceed 10 g.<br />
The difference in weight of the pre-assembled connecting rod, piston<br />
and pin must not exceed 14 g.<br />
98<br />
99<br />
Connecting rod with bearings and pin<br />
Dimensions (mm):<br />
B = 20,015÷20,025<br />
C = 40,021÷40,050 ..... (bearing tightened at 40 Nm)<br />
D = 19,996÷20,000<br />
E = 54,000÷55,100<br />
(B-D) = 0,015÷0,039 (B-D) limit value = 0,060<br />
Note: When driving the small end bearing make sure both oilholes<br />
are aligned.<br />
100<br />
- 46 - FOCS Workshop Manual_cod. 1.5302.858_1° ed_ rev. 00
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