Dayco PB1677N Engine Harmonic Balancer

Dayco Premium OEM Replacement Balancer PB1677N

The Dayco PB1677N is a premium OEM replacement harmonic balancer for select Ford, Lincoln, and Mazda applications. It is built with a cast iron outer ring, neutral balance, and timing marks for accurate crankshaft damping and service alignment.

Dayco’s Premium OEM Replacement Balancer line focuses on direct-fit engine vibration control for vehicles that need OE-style dimensions and pulley configuration. This PB1677N harmonic balancer includes two integrated serpentine pulleys and is specified for applications such as Ford Taurus, Ford Edge, Ford Explorer, Lincoln MKX, and Mazda CX-9.

Key Features

• Part number PB1677N
• Premium OEM replacement harmonic balancer
• Neutral balance with no counterweight
• Cast iron outer ring for durable engine damping
• Timing marks included for service reference
• Two integrated serpentine pulleys: 6-groove and 4-groove
• Crank bore: 1.249 in. (31.71 mm)
• Overall outside diameter: 1.890 in. (48.00 mm)
• Overall width: 2.638 in. (67.00 mm)
• Interchange reference: Dorman 594-401

Detailed Description

This Dayco harmonic balancer is engineered for engines that use a dual-serpentine pulley arrangement and a three-bolt mounting pattern. The PB1677N measures 159.50 mm on the 6-groove pulley and 149.25 mm on the 4-groove pulley, with a 47.50 mm ring width and a 48.00 mm nose outside diameter. It is a direct replacement choice for service work on 2007-2018 Ford Edge, 2011-2017 Ford Explorer, 2008-2019 Ford Taurus, 2007-2017 Lincoln MKX, 2007-2015 Mazda CX-9, and other listed applications.

Use PB1677N when replacing a worn harmonic balancer on vehicles such as the Ford Taurus, Ford Edge, and Mazda CX-9 where crankshaft vibration control and pulley alignment are critical. The part number PB1677N is also a useful reference when cross-checking service parts for the same application.

What It Helps Address

• Crankshaft vibration from a deteriorated balancer
• Belt tracking issues related to worn pulley surfaces
• Timing reference visibility during engine service
• Noise caused by a damaged or out-of-balance harmonic balancer
• Accessory drive alignment concerns on dual-serpentine setups

Installation Notes and Tips

Verify crank bore, bolt hole quantity, pulley groove count, and timing mark orientation before installation. This balancer does not include hardware, installation instructions, a crank trigger/exciter plate, or a Woodruff key. Confirm the engine’s original pulley configuration and application notes, including the 2010 Mazda CX-9 listing that applies to vehicles built through 10/09.

Quality Assurance

Dayco’s Premium OEM Replacement Balancer line is built to match OE-style fitment and service requirements for listed Ford, Lincoln, and Mazda applications. The PB1677N is specified with timing marks and neutral balance for direct replacement use in the confirmed vehicle range.