Dayco PB6312N harmonic balancer for the 1964-1965 Ford Mustang 6-cylinder 2.8L, the 1964-1967 Mustang 6-cylinder 3.3L and other vehicles damps crankshaft vibration at the front of the engine. The Dayco harmonic balancer sits on the nose of the crankshaft and carries the pulley for the drive belt.
Cracks in the hub or ring, timing marks that have worn away, a squealing belt or vibration from the front of the engine can mean a worn engine harmonic balancer. These signs alone do not prove the balancer is at fault, since a tired drive belt can make similar noise.
This balancer is listed for a wide range of Ford and Mercury models, including the 1967-1972 Ford Bronco 6-cylinder 2.8L and the 1971-1972 Mercury Comet 6-cylinder 2.8L. One balancer goes on each engine.
Fit and size
Build and materials
One harmonic balancer. Mounting hardware, a Woodruff key and installation instructions are not included, and the old bolts may not be reusable, so plan on new ones.
Interchange: 594-273 · DA-200
102203 · 6003269
This part cross-references / interchanges with the following part numbers:
Is this Mustang harmonic balancer correct for a 1964-1967 Ford Mustang 6-cylinder 3.3L?
Yes. The Dayco PB6312N is listed for the 1964-1967 Ford Mustang 6-cylinder 3.3L and the 1964-1965 Mustang 6-cylinder 2.8L. For any other model, find your year and engine on the Buyer's Guide tab.
Does the Dayco PB6312N come with bolts and a Woodruff key?
No. This listing is the harmonic balancer only. Mounting hardware, a Woodruff key and installation instructions are not included, so plan on new bolts.
What are the crank bore and outside diameter of the PB6312N?
The Dayco PB6312N has a 31.71 mm (1.249 in) crank bore and a 149.00 mm (5.867 in) overall outside diameter. It also has three bolt holes.
What should I look at on an old balancer before swapping in a new one?
With the engine off and cool, look for cracks, a worn belt groove or timing marks you can no longer read. A shop can check for wobble with the engine running.
Does the Dayco PB6312N replace a balancer numbered 594-273?
Yes. 594-273 is one of the numbers this balancer interchanges with, so the Dayco PB6312N is listed as a match for it.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
