Replacing Motor Mount Horn
Thread Starter
Safety Car
Joined: Oct 2005
Posts: 3,570
Likes: 1
From: Algonac Michigan
Replacing Motor Mount Horn
I had a problem with the motor mount horn on the pass. side of my '69. It was pushed forward approx.3/4" and up approx. 1",so I removed it.
Now I have the new horn and I wanted to run what I think will be a proper procedure for welding up the replacement. I have a blueprint from a prior discussion for the entire frame,and every thing checks out O.K. I was thinking that I would install the eng.,securing the good drivers side mount. And then install the bolts for the trans(4 speed)to the cross member. After having those two mounting points secure,I would tack in the pass side horn with it attached to the rubber mount that is also attached to the motor. Does this sound practicle or should I measure the tailshaft from the centerline for the proper offset? I am under the assumption that the eng. has to be parralell to the frame rails. So do you guys think I am on the right track or not???
Later,
Sly
Now I have the new horn and I wanted to run what I think will be a proper procedure for welding up the replacement. I have a blueprint from a prior discussion for the entire frame,and every thing checks out O.K. I was thinking that I would install the eng.,securing the good drivers side mount. And then install the bolts for the trans(4 speed)to the cross member. After having those two mounting points secure,I would tack in the pass side horn with it attached to the rubber mount that is also attached to the motor. Does this sound practicle or should I measure the tailshaft from the centerline for the proper offset? I am under the assumption that the eng. has to be parralell to the frame rails. So do you guys think I am on the right track or not???
Later,
Sly
Le Mans Master
Joined: Jan 2006
Posts: 9,192
Likes: 27
From: Boca Raton Florida
ok, got a question, was the motor in there and all bolted up and you discovered this after removing the motor? If so, concidering the motor dimentions have not changed, won't that put the new mount back in the same place as before?
Or, was there a problem in the first palce, hence all the work?
Just curious since I am of no help on this one..
Or, was there a problem in the first palce, hence all the work?
Just curious since I am of no help on this one..
Thread Starter
Safety Car
Joined: Oct 2005
Posts: 3,570
Likes: 1
From: Algonac Michigan
I was anxious to get to work on this car and did'nt even notice till I went to install. What really steams me is that I had to cut and grind on a freshly powder coated frame.
. The reason I noticed was that after wresteling with the mounts,I could not get the tailhousing even close to the crossmember mount. At that time I also seen that the eng. was much higher on the pass. side.
Oh Well...
Later,
Sly
. The reason I noticed was that after wresteling with the mounts,I could not get the tailhousing even close to the crossmember mount. At that time I also seen that the eng. was much higher on the pass. side. Oh Well...Later,
Sly
Race Director
Joined: Dec 1999
Posts: 16,945
Likes: 9
I would either use a mockup block with solid mounts, not rubber or build a jig. The mounts are directly in line, neither is further back than the other so you can clamp a long straight beam across the frame and measure from the beam to the suspension mount to get it aligned properly. Then measure where the hole is on the good mount and fabricate a tab that you can weld to the beam so that you can bolt down the new motor mount with that tab. That allows you to properly space them and have the bolt holes parallel to each other. Then tack in place and maybe check w/ a bare motor. That or with the bare mockup block is how I would do it.
Last edited by Twin_Turbo; Jun 5, 2006 at 05:10 PM.
Melting Slicks
Joined: May 2002
Posts: 2,717
Likes: 121
From: Sulphur LA
St. Jude Donor '05-'06,'11,'13-'14,'16,'18,'19,'24, '25
Same thing happened to me on my car. The motor mount was bent up about an inch and moved forward about ½”. I measured from the cross member and used a straight edge across both motor mounts and welded it into place. When I bolted the motor in and than tried to align the trans at the trans mount it would not align. To fix it I had to cut the motor mount off the frame and put the motor in the correct position than tack the mount into place. I removed the motor and welded the mount into place with the mig. I have some pics of the frame repairs in “my corvette photos” under my avatar.
Thread Starter
Safety Car
Joined: Oct 2005
Posts: 3,570
Likes: 1
From: Algonac Michigan
Well I got the motor in and everything aligned. I have just enough meat hitting the r/side frame rail to get some tacks on it. I will then pull the eng and weld that sucka' good...
Later,
Sly
Later,
Sly
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