SECTION 10 – ENGINE – CHAPTER 1
10-17
DESCRIPTION AND OPERATION
1
The CNH 7.5 Litre engine is a 6-cylinder
turbocharged and aftercooled unit, having a bore of
4.4
″
(111.8 mm) and a stroke of 5.0
″
(127 mm) which
generates a displacement of 456 in
3
.
The engine uses a mechanical or electronically
controlled rotary injection pump depending on model
and has been designed to meet current emission
regulations and must only be serviced by an
authorised service agent. For a detailed Description
and Operation of the fuel system reference must be
made to the Fuel System Chapter in this Section of
the manual.
All engines feature cross flow cylinder heads, with
the inlet and exhaust manifolds on opposite sides of
the cylinder head. The fuel and air combustion
process, takes place in the specially designed bowl
in the crown of the pistons.
CYLINDER BLOCK ASSEMBLY
The cylinder block is an alloy cast iron with deep
cylinder skirts, and water jackets for cooling the
cylinders. The cylinder bores are machined integral
with the cylinder block, during the manufacturing
process. The block incorporates hydraulic tappets
which do not require adjustment unless engine is
being re–assembled.
Cylinders are in line and vertical and numbered 1 to
6 from the front to the rear of the engine. They can
be bored oversize for the fitment of sleeves, which
are available in service.
The oil pan is the reservoir for the engine oil
lubrication system and a cast iron front cover on the
front of the engine covers the timing gear assembly.
