DAYCO
ITEM DESCRIPTION
Part No: OAP234
Item Name: DAYCO OVERRUNNING ALTERNATOR PULLEY for AUDI A4 A5 A6 Q5 S4 OAP234
Application:for AUDI
A4
Overrunning Alt Pulley Apr 2008 - Jun 2012, 1.8L, 4 cyl, 16V, DOHC, TMPFI, Turbo, B8, 118kW, EngCode: CABB
Overrunning Alt Pulley Apr 2008 - Jun 2012, 1.8L, 4 cyl, 16V, DOHC, TMPFI, Turbo, B8, 118kW, EngCode: CDHB
Overrunning Alt Pulley Apr 2008 - Jun 2012, 2.7L, V6, 24V, DOHC, DTFI, Turbo, Diesel, B8, 140kW, EngCode: CAMA
Overrunning Alt Pulley Apr 2008 - Jun 2012, 3.2L, V6, 24V, DOHC, MPFI, B8, 195kW, EngCode: CALA
Overrunning Alt Pulley Jul 2008 - Jun 2012, 2.7L, V6, 24V, DOHC, DTFI, Turbo, Diesel, 140kW, EngCode: CGKA
Overrunning Alt Pulley Oct 2008 - Jun 2012, 3.0L, V6, 24V, DOHC VVT, Di, Turbo, 176kW, EngCode: CCWA
Overrunning Alt Pulley Oct 2008 - Jun 2012, 2.0L, 4 cyl, 16V, DOHC VVT, MPFI, Turbo, B8, 132kW, EngCode: CDNB
Overrunning Alt Pulley Oct 2008 - Aug 2013, 2.0L, 4 cyl, 16V, DOHC VVT, MPFI, Turbo, B8, 155kW, EngCode: CDNC
Overrunning Alt Pulley Jul 2012 - , 1.8L, 4 cyl, 16V, DOHC, TMPFI, Turbo, B8, 125kW, EngCode: CJEB
Overrunning Alt Pulley Sep 2013 - , 2.0L, 4 cyl, 16V, DOHC, TMPFI, B8 QUATTRO, 165kW, EngCode: CNCD
A5
Overrunning Alt Pulley Oct 2007 - Feb 2012, 3.2L, V6, 24V, DOHC, MPFI, 8T, 195kW, EngCode: CALA
Overrunning Alt Pulley Oct 2008 - Feb 2012, 3.0L, V6, 24V, DOHC, DTFI, Turbo, Diesel, 8T, 176kW, EngCode: CCWA
Overrunning Alt Pulley May 2009 - Aug 2013, 2.0L, 4 cyl, 16V, DOHC, TMPFI, Turbo, 8T, 155kW, EngCode: CDNC
Overrunning Alt Pulley Aug 2009 - Feb 2012, 2.0L, 4 cyl, 16V, DOHC, TMPFI, Turbo, 8T, 132kW, EngCode: CDNB
Overrunning Alt Pulley Mar 2012 - , 1.8L, 4 cyl, 16V, DOHC, TFSI, Turbo, 8T, 125kW, EngCode: CJEB
Overrunning Alt Pulley Sep 2013 - , 2.0L, 4 cyl, 16V, DOHC, TMPFI, 8T QUATTRO, 165kW, EngCode: CNCD
A6
Overrunning Alt Pulley Oct 2011 - , 2.0L, 4 cyl, 16V, DOHC, TMPFI, Turbo, C7, 132kW, EngCode: CDNB
Q5
Overrunning Alt Pulley Mar 2009 - Sep 2012, 2.0L, 4 cyl, 16V, DOHC, TFSI, Turbo, 8R, 155kW, EngCode: CDNC
Overrunning Alt Pulley Mar 2009 - , 3.2L, V6, 24V, DOHC, FSI, Turbo, 8R, 199kW, EngCode: CALB
S4
Overrunning Alt Pulley May 2009 - Jun 2012, 3.0L, V6, 24V, DOHC, SCMPFI, B8, 245kW, EngCode: CAKA, Supercharged
Spec: Spec:
Description: Overrunning Alternator Pulley
Width: 41.00mm
Outside diameter: 56.2mm
Inside diameter: 17mm
Tool OAPT33
Thread M16
OAP Connection Type: 33 Tooth Spline

**Photo is for product image only**
Description:
Overrunning alternator pulleys are becoming increasingly popular on late model petrol and diesel engines, due to the 
increasing drive belt speed and engine vibration fluctuations. An overrunning alternator pulley is used to smooth out 
rotational irregularities on the alternator, which is caused from rapid acceleration, deceleration and even shut off. 
During normal operating conditions these alternator pulleys can be rotating up to 18,000rpm and with major RPM 
fluctuations unit failure can lead to belt noise, vehicle vibrations and also alternator or drive belt failure. 
Nuline have developed a heavy duty replacement clutch pulley to disengage the alternator so it free spins during 
rotational irregularities. 

How does the Nuline overrunning alternator pulley work?
When the Nuline overrunning alternator pulley is rotated in the normal operating direction it connects to the alternator 
working as a normal pulley. But during deceleration the pulley disconnects from the alternator shaft, allowing the 
alternator to free spin. This is done by a special one way bearing that is mounted inside the Nuline overrunning 
alternator pulley. 
Advantages of using a Nuline overrunning alternator pulley
• Heavy duty designed for long service life
• Dampens drive belt vibration
• Reduced belt slippage during rapid acceleration or deceleration 
• Reduced stress on drive belt and other accessory drives
• Increased alternator and drive belt life
• Reduction of drive belt noise
• Improvement in variation of drive belt tension

Signs of an overrunning alternator pulley failing 
• Unusual drive belt noises
• Unusual vehicle vibrations
• Steering shudder
• Alternator not charging battery

Checking the overrunning alternator pulley
• Remove drive belt
• Check pulley for chips, dents or damage to belt grooves
• Check for excessive bearing movement 
• Rotate Alternator pulley in normal operation direction, pulley should lock up and turn alternator shaft
• Rotate alternator pulley in opposite direction, it should spin freely without the alternator shaft moving
• Rotate the pulley in the free spin direction, it should feel smooth not rough
Note: Please complete the Check Out after winning to ensure smooth transactions.

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