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The Volvo Parts, Accessories &
Performance Specialists Since 1963

3.0 3.2 SI6 Alternator One-Way Decoupler Pulley

INA - 535017510 - 31316804 - 140963

Our Item Number
140963
OEM Reference
31316804
Brand
INA
Mfr Part Number
535017510
Brand Classification
OES
Country of Origin
CANADA
Product Group
REPAIR & MAINTENANCE
Cross Reference
30750109, 31316804

Product Description

Description

When Volvo was developing their "short six" 3.2i and 3.0 T6 engines for transverse installation in engine bays, the accessory belt drive was relocated from the front (left) end of the engine to the rear (right) end, above the transmission. Putting belt-driven accessories like the water pump and A/C compressor in this free space above the transmission makes the six-cylinder SI6 even more compact than the old five-cylinder.

Both the primary accessories and the alternator are driven by this "R.E.A.D." (Rear Engine Accessory Drive) via one-way, freewheeling clutches in the pulleys, allowing the belts and accessories to gradually spin down when RPMs drop off. The extra second or two the accessories spend coasting down allows them to extract a little more energy from their own inertia, saving a bit of fuel while also subjecting the belts to gentler shock loads.

If you're hearing pulley bearing failure noises like squeaks or rattles or grinds, and especially if those noises are slightly delayed after revving the engine, these pulleys are worth replacing. This pulley, made by INA (the Original Equipment Supplier for this part to Volvo) will get you back on the road.

Additional Keywords: FREEWHEEL

About INA

INA is an OE manufacturer of bearings and timing belt related components.  

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