VIDEO: Are All OAD Pulleys The Same?
Andrew Markel explains why two overrunning decoupler pulleys (OAD) may look the same on the outside, but on the inside they may be different. The reason for this is that the OAD pulley is tuned for the engine, drive belt system and alternator.
VIDEO: What Is A Torsional Vibration In The Belt Drive And Pulley System?
Andrew Markel covers how the movement of the pistons create torsional vibrations in the belt drive system. These small changes in the speed of the crankshaft can cause vibration in the alternator and belt drive system. If the vibration goes unchecked, it could lead to belt wear and component failure.
VIDEO: What Is The Difference Between An OAP And An OAD?
Andrew Markel discusses vibration control alternator pulleys, and the differences between the two most common designs available on the market.
VIDEO: Understanding Drive Belt Decouplers
In this video, Andrew Markel discusses a new drive belt service opportunity. Many small engines and diesel engines are coming with decoupler pulleys on the crankshaft that are a mixture between a dual mass flywheel and an alternator decoupler pulley. The pulley can reduce vibrations in the crankshaft and the drive belt system.
Diagnosing Volkswagen Idle Quality Problems
The textbook definition is an engine speed lower or higher than the specification in the service manual. For drivers, idle “quality” is more difficult to define.
Check Out The August Issue Of Tomorrow’s Tech Magazine
The digital version of the August issue of Tomorrow’s Technician magazine is available online.
Engineering Better Belt Systems
You might not be able to see it, but an accessory drive belt is always both speeding up and slowing down.
Auxiliary Water Pump Diagnostics
A car or truck comes into your shop with a complaint of poor heater performance.
MINI Tech Tip: Engine Vibrations Or Noise
A customer complains of engine vibrations and noise. What is the culprit?
Top 10 Changes To Stop/Start Vehicles
It is essential to understand what is different on vehicles with start/stop systems and how it might change your diagnostic approach.
