GM has Revised These Engines to Reduce Noise
GM has Revised These Engines to Reduce
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"Vortec 4800" 4.8L V8
(LR4) and "Vortec 5300" 5.3L V8 (LM7) Features & Benefits
Just two years after the launch, the Vortec 4800 and 5300 get another round of
improvements to improve durability and further reduce scheduled maintenance.
NEW OR CHANGED FOR 2001 MODEL YEAR
- Reduced Main Bearing
- Two-Point Coolant Vapor
- Revised Intake Manifold
- Improved Catalytic
- Improved Mass Air Flow
Sensor with Temperature Sensor
- Extended Oil Change
- Sleeveless Coolant Sensor
MORE PRECISE BEARING FIT
Smaller tolerances in the crankshaft main bearings mean a more precise fit. The
result is an increase in long-term durability and, just as importantly, a
reduction in something known to engineers as "cold knock"--a slight
slapping noise from the engine before it reaches full operating temperature.
For 2001, the main bearing tolerances of these engines have been tightened for
quieter, cold-engine startup. Noise and vibration are also reduced by an intake
manifold revision that results in better isolation of the fuel injection
REVISED INTAKE MANIFOLD
The intake manifold has an improved purge isolator--the rubber device used to
mount the solenoid that manages fuel injection-to reduce noise and vibration.
The new manifold also has a new, more durable injector director plate, with two
large holes rather than four smaller one to reduce potential for clogging.
*This is an excerpt from a GMC Media Brochure
to the "All
New" GM Truck Lemon Center