WATCH: BMW DISA Valve Causing Code

WATCH: BMW DISA Valve Causing Code

In this Tech Minute, Jason Stahl explains how a failing DISA Valve on a BMW can throw various codes and what the replacement options are. Brought to you by Intermotor Genuine Import Parts.

In this Tech Minute, Jason Stahl explains how a failing DISA Valve on a BMW can throw various codes and what the replacement options are. Brought to you by Intermotor Genuine Import Parts.

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The majority of all new cars have them. So you've likely heard the term OAD, referring to an overrunning alternator decoupler pulley. The OAD sold by Continental, is manufactured by Litens. What's so important about an OAD? An OAD is an alternator pulley featuring an internal torsion spring and a one-way clutch mechanism. So not only will it allow the alternator to FreeWheel under engine deceleration, but it will also absorb the constant rapid acceleration and deceleration forces that occur due to changes in crankshaft speed. The benefit of an OAD is a smoother and quieter belt drive system resulting in reduced noise and vibration in the cabin, as well as increased fuel economy. It will also extend the life of the belt, the tensioner, and all driven components by eliminating belt, flutter and slippage. The OAD performs such an important role that when it's time for belt service, if you're replacing high mileage components and recommending a tensioner or idler pulley, it's a good idea to recommend a new OAD To protect all the components of the belt drive system, it's important to note that if the vehicle was originally designed with an OAD pulley, a solid pulley should never be used as a replacement.

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