Service Manual

Engine Mounts ISB, ISBe and QSB (Common Rail [...]
Page 16-46 Section 16 - Mounting Adaptations - Group 16
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Disassemble
WARNING
To reduce the possibility of severe eye damage, wear
eye protection when you drive the gear from the
flywheel. Do not use a steel drift pin or damage to the
component can occur.
Use the brass drift pin to drive the ring gear from the
flywheel.
Assemble
Heat the new ring gear for 20 minutes in an oven
preheated to 127°C [261°F].
WARNING
To reduce the possibility of burns, wear protective
gloves when installing the heated gear.
The ring gear must be installed so the bevel on the teeth
is toward the crankshaft side of the flywheel.
Install the ring gear.
Engine Mounts (016-010)
General Information
Some vibration exists in all piston type engines, due to the pulsating power inputs and reciprocating components.
Some of these vibrations are internal to the engine and are compensated, or balanced, by opposing forces within the
engine structure. These are generally not of interest to vibration isolation designs. The vibrations that are offset or
balanced internally will cause shaking moments and forces that must be reacted to by the engine mounts. If these
moments and forces are not adequately reduced by the engine mounting and isolation systems, they can cause
customer dissatisfaction and/or damage, due to component fatigue.
The effectiveness of an engine mounting system in isolating the vehicle structure from engine vibration depends on
the relationship between the frequency of the vibration coming from the engine and the natural frequency of the
engine mounting system. The mounting system effectiveness is commonly measured with the term “transmissibility”.
Transmissibility is the amount of engine vibration which is transmitted through the mounting system to the vehicle
structure.
Transmissibility values greater than one indicate the engine mounting system is actually transmitting more vibration
into the vehicle structure than is coming from the engine. This is possible if the natural frequency of the mounting