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Engine Description
®
MaxxForce
DT, 9, & 10 engines are inline six cylinder diesel
engines which have been designed for increased durability,
reliability, and ease of maintenance.
Air Management System
®
MaxxForce
DT, 9, & 10 engines use an electronically controlled
two stage turbocharging system consisting of a high-pressure
and low-pressure turbocharger.
turbochargers are installed as an assembly on the exhaust
manifold.
A Charge Air Cooler (CAC) is an air-to-air heat exchanger which
cools and increases the density of the air charge. In addition
®
to the CAC, the MaxxForce
an engine mounted interstage cooler. The cooler has a low
temperature radiator and a low temperature thermostat.
The Exhaust Gas Recirculation (EGR) system circulates cooled
exhaust into the intake air stream in the intake manifold. This
cools the combustion process and reduces the formation of NO
engine emissions.
Cold Start Assist
The Inlet Air Heater (IAH) system warms the incoming air supply
to aid cold engine starting and reduce white smoke during
warm-up. The IAH system will initially illuminate the WAIT TO
START lamp. When the lamp turns off, the engine can be
started.
SECTION 1 – ENGINE SYSTEMS
The high and low-pressure
DT, 9, & 10 diesel engines have
Crankcase Assembly
The camshaft is supported by four insert bushings pressed into
the crankcase. The camshaft gear is driven from the front of the
engine. A thrust flange is located between the camshaft and the
drive gear. The overhead valve train includes mechanical roller
lifters, push rods, rocker arms, and dual valves that open using
a valve bridge.
A gerotor lube oil pump is mounted on the front cover and is
driven by the crankshaft. Pressurized oil is supplied to engine
components and the high-pressure injection system. All Navistar
DT, 9, and 10 engines use an engine oil cooler and spin-on
engine oil filter.
®
MaxxForce
DT engines use a one piece aluminum alloy piston.
®
The MaxxForce
DT, 9, & 10 engines use a one piece steel
piston. The pistons have a 0.0 offset and are fully symmetric.
The one piece crankcase uses replaceable wet cylinder sleeves
that are sealed by a single crevice seal. Some applications
include a crankcase ladder which is designed to absorb heavier
loads and reduce engine noise.
X
A closed crankcase breather system uses an engine mounted
oil separator to return oil to the crankcase and vent crankcase
pressure into the intake system.
Page 17
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