|1990 35th Anniversary Thunderbird Registry|
Crankshaft Harmonic Damper
been an issue develop over time about SC's losing the
harmonic damper and pulley while driving. If this
happens, the extent of damage that can be done under the
hood is almost beyond description. It isn't clear if the
center bolt shears off and the damper assembly detaches
from the engine or if the vibrational forces over time as
the damper gets old puts undue stress on the pulley. It
is to your advantage to check the center of the
crankshaft damper and pulley assembly to make sure the
center bolt is still there. To hopefully bring awareness
of this issue, please read the following article and
information. Even if you are not mechanically inclined,
you will get an idea of the problem that exists with the
My thanks goes to Duffy Floyd for allowing me to share his knowledge of this subject.
This is an
assembledge of the conventional wisdom on the Harmonic
Damper issue we all face.
information from George Davenport, SCCoA:
unit can be damaged if removed incorrectly or as age
degrades it's fit onto the crankshaft. Sometimes the
crankshaft damper is removed when replacing the
crankshaft sensor and old parts are reused. The reasons
may vary but the end result is the same.
Super Coupe Performance, at http://www.supercoupeperformance.com/engine.htm,sells these units and explains their application and installation needs. They are available for the early SC (89-93) and late model SC (94-95). A new crank bolt and washer is definitely required as well. Ford no longer carries the SC part, but a 98 3.8L Mustang bolt and washer, as shown above, will work just fine. Part numbers are F58Z-6A340-A (3-pack bolts) and E2DZ-6378-A (5-pack washers).
I highly recommend that should you ever remove the crankshaft damper assembly, either for an engine rebuild or for whatever reason, you consider replacing the damper with this unit. Let the experience of well known SC enthusiasts help you avoid any major problems.
|I hope this
information is helpful to you. I thank George Davenport
for his additional information and photos on this
|Additional note: On June 4th, I learned that Ford has reinstated to full status the original SC harmonic damper and pulley assembly. The part number is E9SZ-6B321-C. You can order this assembly at your local Ford dealer or you can try internet sources such as www.fordparts.com . The list price at the dealer was quoted to me as $264.13.|
|Disclaimer: This article, and additional information, is for personal use only and for assisting owners in maintaining their vehicle. No publishing or reprinting is allowed unless by permission by the author of this article. The author is not responsible for any damage that occurs from the use of this information.|