Dayco PB1686N Engine Harmonic Balancer

Dayco Premium OEM Replacement Balancer PB1686N

The Dayco PB1686N is a premium OEM replacement harmonic balancer for select Nissan and INFINITI V6 applications. It is built with a neutral counterweight balance, a cast iron outer ring, and timing marks for accurate service work on the crankshaft drive system.

Dayco’s Premium OEM Replacement Balancer line focuses on direct-fit engine vibration control and OE-style service replacement for vehicles such as the Nissan 370Z and 350Z, along with multiple INFINITI G, M, Q, FX, EX, and QX models. The PB1686N is a practical choice when restoring crankshaft damping and accessory drive alignment on these applications.

Key Features

• Neutral balance design with no counterweight
• Cast iron outer ring for durable engine service use
• Single integrated serpentine pulley with 7 grooves
• Timing marks included for service and alignment reference
• Crank bore: 1.260 in. (31.98 mm)
• Nose outside diameter: 1.890 in. (48.00 mm)
• Overall outside diameter: 5.945 in. (151 mm)
• Overall width: 3.130 in. (79.50 mm)
• Ring width: 1.378 in. (35.00 mm)

Detailed Description

The PB1686N harmonic balancer is an engine component used to damp crankshaft vibration and maintain stable accessory drive operation. Its 7-groove serpentine pulley supports the belt drive layout used on the listed Nissan 370Z, Nissan 350Z, and INFINITI VQ-series applications. Timing marks are included to assist with engine service procedures, while the neutral balance configuration matches the specified OE-style setup.

This part number, PB1686N, is listed for 2007-2020 Nissan and INFINITI vehicles with the confirmed fitment shown below. It is a direct replacement option for drivers servicing the crankshaft pulley area on a Nissan 370Z or INFINITI G37, Q50, Q70, and related models.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Crankshaft vibration at idle or under load
• Worn or damaged harmonic balancer outer ring
• Belt tracking or accessory drive alignment concerns
• Timing mark visibility during engine service
• Noise from a deteriorated crank pulley assembly

Installation Notes

Verify crank bore, nose diameter, pulley groove count, and timing mark orientation before installation. Hardware is not included, and installation instructions are not included. Use the vehicle service manual and proper crankshaft holding and torque procedures for the specific Nissan or INFINITI application.

Quality Assurance

Dayco’s Premium OEM Replacement Balancer line is built for OE-style service replacement across the listed applications. Confirm fitment by year, make, model, and engine configuration before ordering the PB1686N.

Compatible Vehicles

• Fits 2009-2020 Nissan 370Z, N/A
• Fits 2014-2019 INFINITI Q70, N/A
• Fits 2015-2019 INFINITI Q70L, N/A
• Fits 2014-2018 INFINITI Q50, N/A
• Fits 2014-2017 INFINITI QX50, N/A
• Fits 2014-2017 INFINITI QX70, N/A
• Fits 2015 INFINITI Q40, N/A
• Fits 2014-2015 INFINITI Q60, N/A
• Fits 2013 INFINITI EX37, N/A
• Fits 2013 INFINITI FX37, N/A
• Fits 2008-2013 INFINITI G37, N/A
• Fits 2012-2013 INFINITI M35h, N/A
• Fits 2011-2013 INFINITI M37, N/A
• Fits 2008-2012 INFINITI EX35, N/A
• Fits 2009-2012 INFINITI FX35, N/A
• Fits 2009-2010 INFINITI M35, N/A
• Fits 2007-2009 Nissan 350Z, N/A
• Fits 2007-2008 INFINITI G35, N/A
• Fits 2008 INFINITI M35, N/A; Mfg. From 06/08