Can I reuse old Enginge Mounts?

[Patrick N.]

Re: Can I reuse old Enginge Mounts?

Michael, that would be interesting to convert this to a safety mount. I'd be interested in learning more on the process if it comes up.

Thanks
Pat

[Michael H.]

Re: Can I reuse old Enginge Mounts?

Michael, that would be interesting to convert this to a safety mount. I'd be interested in learning more on the process if it comes up.

Thanks
Pat

I'm going to call my old race partner because he made one for my car. I only remember that it had one or two bolts that went through the inner and outer plates. I think the bolts were c/sunk allen heads with a shoulder of some sort so the mount still had movement??

[Patrick N.]

Re: Can I reuse old Enginge Mounts?

makes sense with shoulder and counter sunk, should be decent size dia. and grade 8 perhaps?

Thanks Michael!!

[Joe L.]

Re: Can I reuse old Enginge Mounts?

Here is the mount that had me question should I use these again- you can see some cracking on the side. This is the worst of the two, they other lookks reasonable.

My engine is .060" over and a bit more wild cam now so HP and torque may put a bit more stress on the old mounts eh?

Per Jim, Michael and Ridge's comments, it seems like I could use these again -still leaning towards new and swap for judging. I'll post what I end up going with.

Interesting learning though, as I was looking in the AIM per Terry's earlier comment, my mounts are 3886466 which shows under the 327.
427 with AC calls out RPO L36 PART + shim 3910756 (my car is non ac so this should not apply). Other than that callout, it looks like 3886466 was for both 327 & 427 prior to the change to locking style.

Patrick------


Can you see the number 3886466 embossed on this mount? It is not clear to me in the photographs.

In any event, I can tell you that if it were me, I'd be VERY reluctant to re-use this mount.

[Edward J.]

Re: Can I reuse old Enginge Mounts?

Pat, these mount appear to be original, they are not easily replaced, drilling holes in them sounds like a good way to make something not original anymore,saftey mounts are the way to go.Only about 20 bucks each.

[Ridge K.]

Re: Can I reuse old Enginge Mounts?

Here's a pic of the NOS motor mounts I purchased for use on my '67 big block. I am not trying to talk anyone into using NOS units. Keep in mind, these have some age on them, but the rubber has the appearance as when these were new in the day.

These are GM mount kit part number #3990916
The actual motor mounts in this kit are GM part number #3980701, and this number is cast into the rubber on the sides of the mount.

According to my GM parts manual, this mount kit is considered service for 1963 thru 1969 Corvettes.

Hope this sheds some more light on the motor mount issue. Ridge

[Joe L.]

Re: Can I reuse old Enginge Mounts?

Here's a pic of the NOS motor mounts I purchased for use on my '67 big block. I am not trying to talk anyone into using NOS units. Keep in mind, these have some age on them, but the rubber has the appearance as when these were new in the day.

These are GM mount kit part number #3990916
The actual motor mounts in this kit are GM part number #3980701, and this number is cast into the rubber on the sides of the mount.

According to my GM parts manual, this mount kit is considered service for 1963 thru 1969 Corvettes.

Hope this sheds some more light on the motor mount issue. Ridge

Ridge------



These are the 1970-72 PRODUCTION mounts which also became SERVICE for 63-69.

[Ridge K.]

Re: Can I reuse old Enginge Mounts?

Thanks, Joe.

[Ronald L.]

Re: Can I reuse old Enginge Mounts?

My mounts look like the originals 66 427.

Question is, how do you get the bolt out? See picture...

It seems to be locked again the side of the mount and I can't get a socket on the bolt, much less there's not a lot of space to get anything in there to break the bolt loose

[Joe L.]

Re: Can I reuse old Enginge Mounts?

My mounts look like the originals 66 427.

Question is, how do you get the bolt out? See picture...

It seems to be locked again the side of the mount and I can't get a socket on the bolt, much less there's not a lot of space to get anything in there to break the bolt loose

Ronald-----


It does look like it could be an original mount. However, that's pretty much academic since I don't think I'd want to re-use this mount once I removed it from the car.

I do not understand why you're having difficulty with this bolt or why you can't get a socket on it. Other than corrosion, there's no reason for it to be "locked" to the side of the mount.

[Philip C.]

Re: Can I reuse old Enginge Mounts?

Ronald-----


It does look like it could be an original mount. However, that's pretty much academic since I don't think I'd want to re-use this mount once I removed it from the car.

I do not understand why you're having difficulty with this bolt or why you can't get a socket on it. Other than corrosion, there's no reason for it to be "locked" to the side of the mount.

Hi Joe I think hes talking about the mount to block bolt, not the bolt thru the mount, when these mounts get old they flatten out and push against the bolts. Ron when you jack up the motor you have to drive a socket on the bolt. Phil 8063

[Ronald L.]

Re: Can I reuse old Enginge Mounts?

Phil,

Thanks for the tip and yes you are right, the flat on the side of the bolt is up against the side of the mount...and all I was attempting to do was pop that out and replace the ground strap. The forward bolt has a closed angle to the frame bracket making this a fun project. Recommendations on a bolt loosener to free up the rust a bit?

[Patrick N.]

Re: Can I reuse old Enginge Mounts?

Ron,
I am assuming you want to replace your motor mounts and you are not pulling the motor totally out?

It appears that the weight of the motor is compressing the rubber causing it to bulge tight up against the bolts holding the mount to the case. The rubber could be nibbled away to open some room-however:

With the help of an engine hoist to secure the motor, it looks like you need to remove the main bolt holding the mount to the frame to gain some clearance. CAREFULLY, I would raise the motor to release some weight off of the mount which is causing the rubber to compress / bulge. The rubber should still be compliant and a little tapping to get the socket on the fastener should work.

Others may have better advice, but that would be my approach.

Be careful and good luck.
Pat

[Ronald L.]

Re: Can I reuse old Enginge Mounts?

Pat - I was not even going to do that. Just get that bolt out so I can reconnect the ground wire.

While they were not safe (?) Some posts indicate that C2 C3 mounts don't normally break.

I'm not racing this car or even pulling hole shots, at best it gets to purr down the highway.

[Patrick N.]

Re: Can I reuse old Enginge Mounts?

Ah. Since it was linked to this thread, I though you were replacing.

It still seems the compressed rubber is the issue. Did you try getting a closed end wrench on the fastener vs. socket? May need a tap with rubber mallet to get it past the rubber on the mount.