User's Manual
Power Assemblies
The L250’s power assemblies
are designed to meet the
high-pressure demands of
the engine while adhering to
strict reliability requirements
and an easy-to-maintain assembly
concept. Unitized cylinder
assembly enables quick change-
outs and increased engine uptime.
Each assembly is mounted directly
to the mainframe and includes liner
assembly, cylinder head, intake
and exhaust valves, valve linkage and a
high-pressure fuel-injection pump and nozzle. This
design enables excellent ow paths for combustion,
lower fuel consumption and reduced emissions.
Pistons
Our pistons are ruggedly designed to accommodate
the high-peak ring pressure requirements of L250
engines. The pin and skirt components are also
designed to yield better piston lubrication and
guidance as it travels within the liner. The design
helps minimize oil consumption and blow-by as well
as lengthen oil life.
Camshafts
The camshafts on the L250 are made of sectional
carbon steel forgings joined by dowel-bolted
anges, a design that simplies component
removal and replacement. Individual sections of the
camshaft, rather than the entire camshaft, can be
serviced or replaced.
Connecting Rod Assembly
The forged-steel connecting rods are exceptionally
strong and exhibit high stiness, which is benecial
during the engine’s lifetime. Large bearing widths
with optimized oil grooves also help improve oil-
lm thickness and pressure, allowing for optimum
performance and lower friction losses.
Advanced EFI
Designed for greater eciency at varying speeds
and loads, the L250’s electronic fuel injection
features precise fuel control, increased pressure
capability and rened timing. Optimization of the
cam prole, injection start, injection volumes and
ows, and control algorithms have produced a
relatively simple system, proven reliable through
extensive validation.