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FOCS Workshop Manual_cod. 1.5302.351_7° ed_ rev. 06
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4
CONNECTING ROD
Caution – Warning
While reassembling the big end bearings, we suggest cleaning
all parts thoroughly, as well as proper greasing in order to
avoid risks of seizure at the first start.
Big end bearing
After connecting rod from crankshaft disconnection, check the
following.
While reassembling, be sure the two centring notches A an B are
on the same side.
Tighten the connecting rod big end cap screws simultaneously at
a torque of 40 Nm.
Note: The big end bearing is supplied both at the nominal value
and undersized by 0.25 and 0.50 mm.
In the LDW 502 engine with light alloy crankcase the
connecting rod is aluminium type and not provided with
connecting rod big end bearing and small end bush.
Connecting rod with bearings and pin
Dimensions (mm):
A =126,48÷126,52
=106,98÷107,02..... (for LDW 502)
B =18,015÷18,025
=20,015÷20,025..... (for LDW 702-1003-1204/T-1404)
C =40,021÷40,050..... (bearing tightened at 40 Nm)
D =17,996÷18,000
=19,996÷20,000..... (for LDW 702-1003-1204/T-1404)
E =50,900÷51,100
=54,000÷55,100..... (for LDW 702-1003-1204/T-1404)
(B-D) = 0,015÷0,039 (B-D) limit value = 0,060
Nota: When driving the small end bearing make sure both oilholes
are aligned.
Connecting tod, weight
Weigh connecting rods when replacing them in order to avoid
unbalance.
Important
The difference in weight should not exceed 10 g.
The difference in weight of the pre-assembled connecting rod, piston
and pin must not exceed 14 g.
Disassembly / Reassembly
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