Symptom | Possible Sources | Action |
Accessory drive belt noise | Accessory drive system | CHECK the system with the
engine running and the
accessory drive belt removed
(only run the engine for a very
short period). If a noise is
apparent, the cause is not the
accessory drive system. If a
noise is not apparent, the
cause is the accessory drive
system. CHECK where the
noise is coming from. Use a
stethoscope or other listening
device to determine the source
of the noise. INSTALL new
components as necessary.
TEST the system for normal operation. |
Accessory drive belt incorrectly installed. | CHECK the accessory drive
belt is correctly installed in the
pulley grooves. INSTALL a new
accessory drive belt as necessary.
REFER to: Accessory Drive Belt (303-05 Accessory Drive - 2.5L Duratec (147kW/200PS) - VI5, Removal and Installation). and/or REFER to: Air Conditioning (A/C) Compressor Belt (303- 05 Accessory Drive - 2.5L Duratec (147kW/200PS) - VI5, Removal and Installation). TEST the system for normal operation. |
|
Pulley(s). | CHECK the pulley(s) for
damage, freedom of rotation,
stone entrapment and alignment.
INSTALL new components as necessary. TEST the system for normal operation. |
|
Lubricant or other contamination. | CHECK the accessory drive
belt for contamination or
damage. RECTIFY the source
of the leak and INSTALL a new
accessory drive belt.
REFER to: Accessory Drive Belt (303-05 Accessory Drive - 2.5L Duratec (147kW/200PS) - VI5, Removal and Installation). and/or REFER to: Air Conditioning (A/C) Compressor Belt (303- 05 Accessory Drive - 2.5L Duratec (147kW/200PS) - VI5, Removal and Installation). TEST the system for normal operation. |
|
NOTE: Squeal is defined as a
continuous shriek, most noticeable
when the engine is being accelerated
or with electrical load. Accessory drive belt squeal |
Accessory drive belt tensioner worn, damaged or contaminated with oil. |
|
NOTE: Whine is defined as a
continuous noise at the same
frequency, generally associated
with plastic pulleys.
|
Poor surface finish on accessory drive belt idler pulley flat surface(s). | REMOVE the accessory drive
belt.
REFER to: Accessory Drive Belt (303-05 Accessory Drive - 2.5L Duratec (147kW/200PS) - VI5, Removal and Installation). and/or REFER to: Air Conditioning (A/C) Compressor Belt (303- 05 Accessory Drive - 2.5L Duratec (147kW/200PS) - VI5, Removal and Installation). INSPECT the idler pulley(s) for surface finish. INSTALL a new idler pulley(s) as necessary. TEST the system for normal operation. |
Accessory drive belt idler pulley bearing failure. | REMOVE the accessory drive
belt.
REFER to: Accessory Drive Belt (303-05 Accessory Drive - 2.5L Duratec (147kW/200PS) - VI5, Removal and Installation). and/or REFER to: Air Conditioning (A/C) Compressor Belt (303- 05 Accessory Drive - 2.5L Duratec (147kW/200PS) - VI5, Removal and Installation). INSPECT the idler pulley(s) for smooth rotation. INSTALL a new idler pulley(s) as necessary. TEST the system for normal operation. |
|
NOTE: Chirp is defined as a twittering
noise, often intermittent Accessory drive belt chirp |
Pulley misalignment (usually evident at idle). |
|
NOTE: Rattle is defined as a
metallic knocking noise
|
Accessory drive belt tensioner hitting the end stops. | CHECK the accessory drive
belt tensioner for correct operation
or damage. REFER to the
Accessory Drive Belt Tensioner
Component Test in this
procedure. INSTALL a new
accessory drive belt tensioner
as necessary.
REFER to: Accessory Drive Belt Tensioner (303-05 Accessory Drive - 2.5L Duratec (147kW/200PS) - VI5, Removal and Installation). or REFER to: Air Conditioning (A/C) Compressor Belt Tensioner (303-05 Accessory Drive - 2.5L Duratec (147kW/200PS) - VI5, Removal and Installation). TEST the system for normal operation. |
Loose components or hardware. | CHECK the components or
hardware for correct installation
and tighten as necessary.
TEST the system for normal operation. |