Manual

Cat
®
C18 Engine with ACERT™
Technology. Caterpillar optimizes engine
performance while meeting U.S. EPA
Tier 3 and European Union Stage IIIa
engine emission regulations. ACERT™
Technology reduces emissions during the
combustion process by using advanced
technology in the air and fuel systems, in
conjunction with integrated electronics.
Caterpillar meets emission regulations
at the combustion source, rather than
recycling exhaust gases.
Block. The C18 block incorporates a one-
piece, grey iron block, featuring generous
ribbing for stiffness and heavy bearing
bulkheads for rigidity and strength.
Caterpillar also has moved away from
pipe thread ports to straight-thread,
o-ring connection points, reducing the
potential for leaks. This new design
supports the engine’s higher compression
ratios and increased power density.
Cylinder Head. The new cross flow air
design routes air straight across the head
removing bends and turns that create
resistance to flow. By removing the
resistance to flow, parasitic loads are
reduced as pumping needs are lessened.
The cylinder head is a one piece, cast
iron component with a newly designed
graphite and steel composite head gasket
that seals the combustion chamber with
better rigidity and wear capability.
Overhead Cam. A single overhead
cam is driven by gears on the front of
the engine, which significantly reduce
noise and vibration. Caterpillar also has
added two pendulum absorbers, mounted
at the front of the camshafts to further
reduce noise and vibration.
Pistons, Connecting Rods, Cylinder Liners.
New design and material improvements
to the pistons, rods and liners have been
made to support the higher cylinder
pressures and the 16.3:1 compression
ratios associated with ACERT
Technology, while still providing
durability to engine overhaul.
A single-piece steel piston, pulsator-tested
to 25 560 kPa (4,000 psi), is matched to
a robust connecting rod to ensure long
component life. The piston’s steel skirt
increases its durability and results in
reduced thermal expansion, allowing
a tighter piston fit and reduced liner
vibration. The overall piston surface
area reduces friction and enhances
fuel economy.
The newly designed connecting rod
allows better lubrication and cooling
and is more securely fastened to the
crankshaft using two additional bolts.
The new improved rod bearings are made
of steel-backed copper alloy with lead
tin overlay. This new metallurgy reduces
flaking and offers better fatigue strength.
Cylinder liners are wet liners made of
compacted graphite and iron for excellent
wear and strength characteristics.
Also, the tolerances between the pistons
and the wet cylinder liners have been
tightened to unprecedented levels for
reduced blow-by and higher efficiency.
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The Cat
®
C18 engine with ACERT™ Technology is built for power, reliability and efficiency
for superior performance in the toughest applications.
Power Train – Engine