When placing the alternator low on the cool side of a Renesis, an idler
pulley is necessary to avoid interference with the crank position
sensor. If a tensioning idler pulley is used, the alternator can be
fixed in place without an adjusting arm.

There is limited space to install a pulley, so a small unit is best. A
few units are small enough to possibly fit in the available space (first
3 pics). Timing belt idlers are often smaller, lighter and simpler (last
pic).  Am I correct to assume that most timing belt pulleys and their
bearings are NOT designed to handle the loads of a serpentine belt
running the water pump and alternator?

Scott Gettings

Good work Scott. Thanks for all the idler pictures.

Yes.  Best use an idler designed for the job.

Paul Lamar ...No rotor no motor.


Don't use a plastic idler pulley if it is located where it can receive
radiant heat from the exhaust system.  It will fail.  Use aluminum
aftermarket pulleys.


John Steere

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