Why did G.M. mount the volt. reg. to the radiator support with just 3 screws ( on my 68 chevelle ss NOM) and on other models use the threaded rubber ferreles as a vibarating cushion?IMHO they should all have had the threaded rubber.I believe these would last longer and require a seperate ground wire from the base of the vol. reg. to the rad.support.

I always thought the rubber was for insulation..??..:confused:

Somebody will know better than I would, though--

The reg is supposed to be mounted on those rubber inserts.
I bought a new insert/screw set for my '67 from Hinshaw's when swapping the regulator over to a Wells VR715 electronic version.

I thought it depended on the year? Didn't the 68 and newer bolt directly to the radiator support and the older ones used the rubber mounts?

My 68 is mounted on the radiator support, no rubber insert.

'67 assembly manual shows the rubber insert nuts, '68 shows sheet metal screws going directly into the radiator support.
Why did they do it?? Probably because it saved money (fewer parts) and made assembly easier. I can't see why isolating it would make the part last any longer.
BillL

The reg should be an epoxy-filled device. These are generally more resistant to shock, vibration and weather than just sealed housing units. This being said, my MSD6AL is epoxy filled but also comes with rubber mounts. :confused:

The reg should be an epoxy-filled device. These are generally more resistant to shock, vibration and weather than just sealed housing units. This being said, my MSD6AL is epoxy filled but also comes with rubber mounts. :confused:


If the voltage regulators were epoxy filled then the (2) relays with the magnetic levers would not move and make them inoperatable.

Electronic regulators have no mechanical, moving parts inside. They might have an epoxy potting, but maybe not.

Electronic regulators have no mechanical, moving parts inside. They might have an epoxy potting, but maybe not.


You are correct , the replacment ones are solid state but the nos voltage regulators do have movable parts inside.Take a working nos cover off and watch it work mounted and the engine running.

The reason mechanical regulators are mounted on the rubber standoffs is to dampen vibration that can make the relays switch when they shouldn't which can screw up the voltage regulation.

The MSD 6AL that I have, and that my friend Brian has, are not epoxy filled. We have taken them apart to see. Although they have no mechanical parts (like relays) they use rubber mounts due to the effects of vibration on the soldering of some of the parts on the circuit board. Vibration of the right frequency and magnitude can cause the solder joints to go bad or components to break off the board. The rubber acts as a damper and lowers the magnitude of the vibration but not the frequency.

Ron