Dayco PB6312N Engine Harmonic Balancer

Dayco PB6312N Harmonic Balancer Overview

The Dayco PB6312N is a premium OEM replacement harmonic balancer for select Ford and Mercury applications. It is built with a neutral balance design, a cast iron outer ring, and timing marks for accurate engine service and alignment.

Compatible With 1964-1972 Ford Bronco, 1969-1971 Ford E-100 Econoline, 1964-1967 Ford Mustang, and 1964 Mercury Villager applications that use a single-groove V-belt setup.

Key Features

• Neutral balance design with no counterweight
• Cast iron outer ring for durable engine service
• One integrated pulley with a single-groove V-belt profile
• Timing marks included for setup and inspection
• 3-bolt hole configuration
• Crank bore: 1.249 in. (31.71 mm)
• Overall outside diameter: 5.867 in. (149.00 mm)
• Overall width: 1.776 in. (45.10 mm)

Product Details

Dayco PB6312N is part of the Premium OEM Replacement Balancer line, which focuses on direct-fit engine service components for applications that require OE-style dimensions and function. This harmonic balancer uses a cast iron outer ring, a 1.752 in. nose outside diameter, and a 0.695 in. ring width to match the listed engine configuration. The unit includes timing marks and does not use a crank trigger/exciter plate or woodruff key.

This part cross-references ATP 102203 and Dorman 594-273 for the same application. Dayco PB6312N is a direct-fit option for classic Ford Mustang, Ford Bronco, and Ford E-100 Econoline engine service where the original balancer has worn, separated, or lost timing accuracy.

Common Problems This Part Can Address

• Worn or deteriorated harmonic balancer rubber isolation
• Visible wobble or vibration at the crankshaft pulley
• Incorrect or hard-to-read timing marks
• Noise from a failing front engine accessory drive component
• Loss of smooth crankshaft damping in serviceable OE-style applications

Installation Notes and Tips

Verify crank bore, bolt-hole pattern, pulley style, and overall dimensions before installation. This balancer is listed for single-groove pulley applications and does not include hardware or installation instructions. Confirm timing mark orientation and inspect the crank snout and mating surfaces for wear before assembly.

Quality Assurance

Dayco’s Premium OEM Replacement Balancer line is built for OE-style fitment and service consistency in listed Ford and Mercury applications. Use the confirmed vehicle fitment and dimensional specifications to match the correct harmonic balancer for your engine.