Milton CAT 770 - Manual (Page 4)

Cat ® C15 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 C15 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 18:1 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 ® C15 engine with ACERT™ Technology is built for power, reliability and efficiency
for superior performance in the toughest applications.
Power Train – Engine