Vibration Analysis - Engine/Accessory Isolation - Suzuki XL7 2007 Service Manual

1D-44 Engine Mechanical:
Vibration Analysis - Engine/Accessory
Isolation
Test Description
The numbers below refer to the step numbers on the
diagnostic table.
5.
A loose, damaged, misaligned, or defective powertrain
insulator and/or bracket may create a transfer path into
the passenger compartment.
6.
A loose, damaged, misaligned, or defective exhaust
system insulator and/or bracket may create a transfer
path into the passenger compartment.
7.
Incorrectly seated and/or aligned powertrain
components and/or exhaust system components may
create a transfer path into the passenger compartment.
When loosening powertrain mounts in order to re-bed
the powertrain observe the following:
Do not loosen the mount bracket-to-engine bolts/nuts,
do not loosen the mount bracket-to-vehicle frame bolts/
nuts if mount brackets are used.
Loosen the mount-to-mount bracket bolts/nuts if mount
brackets are used, or loosen the mount-to-slotted holes
in vehicle frame bolts/nuts if a direct-mount design is
used.
8.
Step
WARNING
!
Refer to Work Stall Test Caution.
Were you sent here from the Vibration Analysis - Engine
1
table?
Is the J 38792-A, Electronic Vibration Analyzer (EVA) 2,
2
available?
1. Using the engine RPM and frequency data recorded for
the customer's vehicle, determine the order of engine
rotation to which the disturbance is related.
2. Determine the possible causes of the disturbance as it
3
relates to a specific order of engine rotation.
Refer to "Engine Order Classification".
Does the Engine Order Classification table indicate that the
disturbance is of the same order as the engine firing
frequency?
Does the Engine Order Classification table indicate that the
4
disturbance is likely related to engine driven accessories?
Non-rotating engine driven accessory component
systems can no longer produce a unique disturbance.
9.
Non-rotating engine driven accessory components can
no longer produce a unique disturbance. If a disturbance
is still present, but the characteristics have been altered,
it is possible that these component systems are acting
as a transfer path for engine firing frequency or a first
order engine disturbance.
If a disturbance is still present, but the characteristics
have NOT been altered, it is NOT likely that these
component systems are acting as a transfer path for
engine firing frequency or a first order engine
disturbance.
10.
If the mark placed on the face of an engine driven
accessory pulley seems to stand still while running this
test, then that accessory system is either responding to
an existing frequency, such as engine firing pulses, or
creating a disturbance.
11.
A loose, damaged, misaligned, or defective engine
driven accessory system insulator and/or bracket may
create a transfer path into the passenger compartment.
12.
Removing the engine driven accessory and bracket, or
brackets from the engine allows a thorough inspection to
determine if any conditions are present that may create
a transfer path into the passenger compartment.
Action Yes
Go to "Vibration
Go to Step 2
Analysis - Engine"
Go to Step 3 Go to Step 5
Go to Step 5 Go to Step 4
Go to Step 8 Go to Step 5
No