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Noisy tick-over? Fit an over-running alternator pulley (OAP) ...


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Not sure if this has been posted before, but it's certainly worth a comment - for diesel owners at least!

I've just had my indy mechanic fit an Over-running Alternator Pulley (INA 535 0223 10) that I purchased online from SparePartsStore24 (GBP43.53 incl shipping) ... it had to be delivered from Berlin taking 6 days from order to delivery. Replaced the auxiliary/serpentine belt as well. The reduction in tick-over noise is immediately noticeable, she is now purring like a kitten rather than rattling like a tractor!

The 'OAP' fits both the Visteon and the Bosch alternator using the appropriate spacers that are part of the kit ... 3mm (Visteon) and 1.4mm (Bosch).

Apparently there is also a tensioner/pulley modification that, some have said, further softens the noise. This I shall consider at a later date.

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Thanks for the information Rowley, certainly worth a small investment to get big returns on noise reduction but also has many other beneficial effects upon the engine and ancillary components


The advantage of the OAP with a one way clutch is reduction in the force level in the belt drive. This extends the life typically by a factor of 10 of individual components, while ensuring an increase in the generator speed and a reduction in noise. In addition, the engine runs more smoothly. The OAP also contributes towards the reduction of fuel consumption and therefore CO2 emissions. 


Read more here http://www.eurekamagazine.co.uk/design-engineering-features/technology/overrunning-alternator-pulley-improves-internal-combustion-engine/39568/

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That's an interesting article Trevor, thank you.  It gives much more detailed information than that which decided me to fit the OAP in the first place.  It would now seem that I've inadvertently improved the efficiency and lengthened the durability of many other component parts as well as initiating noise reduction.  WIN-WIN!

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  • 2 years later...

I’ve wanted to do this mod for some months now but I’m unable to find a supplier who will guarantee fitment, they have them for the petrol models of the X type but not the diesel. The supplier you mention says that version is only for 3 variant models of a Ford transit? Obviously I don’t want to be out of picket and with my car I mobile. Any advice is helpful. 

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  • 3 years later...

Hi, fitting INA OAP alternator pulley appeals to me but need someone in Surrey area to fit it! Any leads would be appreciated thanks

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