GM has Revised These Engines to Reduce Noise GM has Revised These Engines to Reduce Noise

 

"Vortec 4800" 4.8L V8 (LR4) and "Vortec 5300" 5.3L V8 (LM7) Features & Benefits

OVERVIEW
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 Tolerances
  • Two-Point Coolant Vapor Vents
  • Revised Intake Manifold
  • Improved Catalytic Converters
  • Improved Mass Air Flow Sensor with Temperature Sensor
  • Extended Oil Change Interval
  • Sleeveless Coolant Sensor
CUSTOMER BENEFITS

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 solenoid.

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

Back to the "All New" GM Truck Lemon Center