Re: 39 Packard SIX Transmission mounts

Posted by HH56 On 2019/10/8 9:57:20

I think Chris might have good idea worth trying. Many years ago before Steele started offering very many Packard items (mid 80s) I had a similar situation with the rubber being separated on the bottom piece of the 47. When making something else for another car (body mount pads) I found there would be some material left over when that project was completed so decided to see what would happen in casting new "rubber" for the mount. I removed the old deteriorated rubber and cleaned the parts very well. The parts must be grease free or the casting material will not bond.

Made a jig to hold the pieces in the proper orientation and wrapped the spring with tape to form a mold to confine the material and then cast new "rubber" in the mount using a urethane casting product. At the time product availability was somewhat limited so I used a Devcon product called Flexane 80 as that was sold by a local industrial place. The Devcon product is still available and today there are other mfgs making comparable products. Smooth-On is one of the better known that is easily found at various online places as well as thru local distributor stores. I believe Reynolds America is their own distribution channel and those stores are in many larger cities. They have trial size amounts for less than $50 in their PMC line that range from a 70 to 90 durometer. One of those might be suitable since they are used for industrial anti vibration motor mounts and conveyor belt repair as well as for making the extremely durable concrete stamping molds.

There are others on this forum who might be able to better say which durometer range is best for the mount but the shore 80a I used with the Flexane product is comparable to a shoe heel according to Smooth-Ons charts. 60a and 70a is a tire tread range and 90a is a shopping wheel cart. Point of this long dissertation is after the repair and many years of sitting, when I went to put the 47 back together 5 or 6 years ago the mount appeared to still be in excellent condition and very well bonded. I ordered Kanters repro side mounts and used the repaired rear mount.

That might be an option on yours as the materials would be a relatively small outlay compared to sending it away for vulcanization and could be done in a few hours with a 2 day curing time before the advertised hardness is obtained. In the future if you found it did not work then you are only out a relatively small amount of $ and time lost and you could still send the piece in.