Ford harmonic balancers, or crankshaft vibration dampers, are identified by basic part number 6316. A harmonic balancer (or just "balancer") is a heavy, circular device mounted on the snout of the crankshaft to help balance the engine's reciprocating assembly. OEM balancers are constructed of a cast iron hub and a steel outer timing ring with a layer of vulcanized rubber between the hub and ring. The hub is keyed for proper location when mounting on a crank, ensuring that the timing marks present on the ring line up where they're supposed to be. The front of the hub has three mounting holes to secure the crankshaft pulley. Both standard engine block blue or semigloss black paint appears on original balancers.
The 428 CJ and 428 SCJ used different balancers, each of which can be identified by casting numbers found on the hub. When compared side-by-side, the SCJ balancer is obviously wider and thicker than the CJ balancer. Interestingly, the 428 CJ balancer was also used on 390 and standard 428 FE engines. Thanks to Jim Kruse for letting me borrow his SCJ balancer for these pictures!
Front view of 428 SCJ balancer (left) and 428 CJ balancer (right)
Rear view of 428 SCJ balancer (left) and 428 CJ balancer (right)
| Engine | Casting Number | Outside Diameter | Thickness |
|---|---|---|---|
| 428 CJ | C8AE-A1, A2 | 7" | 1.125" |
| 428 SCJ | C8AE-C | 7.5" | 1.5" |
I've also receive reports of 428 CJ balancers with casting numbers C8AE-AA and C8AE-AB, but I haven't personally seen one of these balancers -- have you? If so, please consider sharing a picture.
The timing ring on the 428 CJ balancer has timing marks from 10 degress after top-dead center (ATC) to 30 degrees before top-dead center (BTC). The SCJ balancer has timing marks from 10 degress ATC to 46 degrees BTC. A letter-digit date code, such as "B8" for February 1968 or "K8" for October 1968, is present just to the right of the "BTC" mark.
If you have an original balancer that you'd just hate to toss, know that they can be rebuilt and made better than new! See the restoration services page for details.
Thanks to Bill Upham of Mansfield Mustang for these images:
C8AE-A1 CJ
casting number detail
C8AE-A2 CJ casting number
detail
Thanks to Jim Kruse for the balancer loan that allowed me to take this picture:
C8AE-C SCJ casting number detail
© 2001 Scott A. Hollenbeck. All Rights Reserved.
