II. Engine Component Description
U L-Series Diesel 13
Piston Sizing
Pistons are matched during assembly to the
final bore diameter and deck height
dimensions. Piston clearances are set-up at the
factory within a window to keep noise to a
minimum level; but these clearances are tight
enough to prevent piston skirt galling.
L-Series engines do not use replaceable
cylinder liners. Service grade pistons are
available for warranty repairs, in standard size
only.
If the engine is out of warranty, pistons are
available for cylinders bored .010 over. Boring
the cylinders and use of oversize pistons is not
approved for Isuzu warranty repairs.
TIP: Previously, pistons were bore sized and
identified with grade lettering for service
replacement. This system has been terminated
for the L-series engine and your parts book
should reflect the change. Please refer to
bulletin #AIPDN-PTS-ED02-98 for ordering
replacement pistons.
Note: The bore size identification stamp is
located on the block just above the fuel pump
hole.
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