Lombardini 9 LD 625-2 EPA, Workshop Manual

Page: 39 / 88

- 39 - 9LD Workshop Manual _ cod. 1.5302.286 - 3° ed _rev. 02
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Distance between the piston at the top dead centre and the
cylinder surface
Head seal thickness
Disassembly / Reassembly
CONNECTING ROD
Remove the oil sump.
Remove the connecting rod cap.
Important
Both connecting rod/piston units should be fitted back into the
corresponding cylinders; mark them so as to identify the correct
combination during reassembly.
Â
See page 40 for specifications as to the tightening of the connecting
rod big end bearing.
Piston clearance
Piston clearance = 0.65 ÷ 0.70 mm, for standard engines
= 0.55 ÷ 0.60 mm, for 97/68 CE and EPA engines
The piston in the TDC (top dead centre) position may extend or be
short of the upper surface of the cylinder.
Use a dial indicator to measure the difference between the two
surfaces (piston crown and upper cylinder surface) and use a suitable
thickness copper gasket
B for the cylinder head to adjust the
clearance volume A .
(See image below)
Piston - Refitting
Connect piston to connecting rod in a way that the combustion chamber
centre
b is at right angle under nozzle tip a .
Lubricate piston pin and introduce it into the piston by exerting pressure
with your thumb.
Check that both circlips are well inside their seats.