Dayco PB1205N Engine Harmonic Balancer

Dayco Premium OEM Replacement Balancer PB1205N

The Dayco PB1205N is a premium OEM replacement engine harmonic balancer built for Ford and Mercury applications that require a 4-bolt, hub-weighted design with timing marks. It is specified with a cast iron outer ring, no integrated pulleys, and a 6.359-inch overall outside diameter for accurate crankshaft damping and timing reference.

Key Features

• Engine harmonic balancer for select Ford and Mercury V8 applications
• 4 bolt hole quantity with hub weighted counterbalance
• Cast iron outer ring for durable construction
• Timing marks included for service and setup
• Crank bore: 1.374 in. (34.89 mm)
• Nose outside diameter: 1.878 in. (47.70 mm)
• Overall outside diameter: 6.359 in. (161.50 mm)
• Overall width: 3.504 in. (89.00 mm)
• Ring width: 0.767 in. (19.48 mm)
• No crank trigger/exciter plate, no integrated pulleys, and no woodruff key included

Detailed Description

Dayco Premium OEM Replacement Balancer PB1205N is engineered as a direct-style engine harmonic balancer for classic Ford Bronco, Mustang, LTD, E-100 Econoline, and Mercury Cougar and Montego applications listed in the fitment data. This balancer uses a hub weighted counterweight balance and a cast iron outer ring to help maintain crankshaft damping characteristics while providing visible timing marks for ignition and service checks. This part cross-references ATP 102100 and Dorman 594-083 for the same application. The PB1205N part number is also a useful reference when sourcing a replacement balancer for 1977-1980 Ford F-100, F-150, F-250, F-350, and Econoline van applications.

What It Helps Address

• Crankshaft vibration from a worn or damaged harmonic balancer
• Timing mark visibility issues during ignition setup
• Noise or imbalance caused by a deteriorated outer ring
• Service problems on engines requiring a 4-bolt balancer pattern
• Replacement needs for aging Ford and Mercury engine assemblies

Installation Notes and Tips

Verify crank bore, nose outside diameter, bolt hole quantity, and overall dimensions before installation. This balancer does not include hardware, installation instructions, a crank trigger/exciter plate, or a woodruff key, so reuse or source the required engine-specific components separately. Confirm timing mark orientation and match the balancer to the listed vehicle application before final assembly. Compatible fitment includes 1977-1978 Ford F-100, F-150, F-250, F-350, Bronco, and Econoline models, plus 1968-1969 Ford Bronco, LTD, Mustang, and 1968 Mercury Cougar applications.

Quality Assurance

Dayco’s Premium OEM Replacement Balancer line is positioned as an OE-style replacement range for service work where factory-fit dimensions and timing reference features matter. The PB1205N is listed with defined dimensional specifications and confirmed vehicle fitment for 34 applications across Ford and Mercury models.