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1/6/13 2:38am - Original Message: 'Engine Shims'
ROCKRDR
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Lakeside, AZ - USA

Vette(s):
1975 C3 Stingray

Joined: 7/23/2012
Posts: 126
I put some side pipes on today and one side (passenger) is low..seams normal, but the drivers side is rubbing on the bottom of the body pretty hard. Do I need to shim the passenger side mount? has anyone else had this issue?

____________________________________
1975 Corvette Coupe 
My first Vette.....trying to fix stuff

My Project:
https://docs.google.com/folder/d/0B6uOAIjGf3cWejQ5TjNkcVRybGs/edit
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1/6/13 12:12pm - Reply: 'Re: Engine Shims'
JohnRR
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Joined: 2/22/2011
Posts: 110
You might need new motor mounts.  Are they oil soaked or broken?  

John


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1973 BB 4-Speed Coupe Project Car
2009 Z06 Mostly Stock
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1/6/13 12:37pm - Reply: 'Re: Engine Shims'
ROCKRDR
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Lakeside, AZ - USA

Vette(s):
1975 C3 Stingray

Joined: 7/23/2012
Posts: 126
the mounts are brand new solid mounts

____________________________________
1975 Corvette Coupe 
My first Vette.....trying to fix stuff

My Project:
https://docs.google.com/folder/d/0B6uOAIjGf3cWejQ5TjNkcVRybGs/edit
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1/6/13 2:03pm - Reply: 'Re: Engine Shims'
ROCKRDR
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Lakeside, AZ - USA

Vette(s):
1975 C3 Stingray

Joined: 7/23/2012
Posts: 126
side difference

Pass:



Drive:




____________________________________
1975 Corvette Coupe 
My first Vette.....trying to fix stuff

My Project:
https://docs.google.com/folder/d/0B6uOAIjGf3cWejQ5TjNkcVRybGs/edit
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1/6/13 2:19pm - Reply: 'Re: Engine Shims'
Willis76 Lifetime Member
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Rockland, MA - USA

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76, L48, 4spd & 09, LS3, 6spd

Joined: 1/30/2003
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You may need to trim the lower fender. See this for installation: http://willcoxcorvette.com/instructions/side_exhaust_install_guide_1969-1982.pdf
 
Looks good! Clap


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1/6/13 2:27pm - Reply: 'Re: Engine Shims'
ROCKRDR
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Lakeside, AZ - USA

Vette(s):
1975 C3 Stingray

Joined: 7/23/2012
Posts: 126
Willis76 said: You may need to trim the lower fender. See this for installation: http://willcoxcorvette.com/instructions/side_exhaust_install_guide_1969-1982.pdf
 
Looks good! Clap


good to know, but should it be off this much?

____________________________________
1975 Corvette Coupe 
My first Vette.....trying to fix stuff

My Project:
https://docs.google.com/folder/d/0B6uOAIjGf3cWejQ5TjNkcVRybGs/edit
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1/7/13 1:33pm - Reply: 'Re: Engine Shims'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

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#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

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Hmmm.....first question....Are you using the factory exhaust manifolds?If so, is the heat riser still on the passenger side?
It's hard to really tell from the pics how much difference there is, since the pass side pic is taken from below level, and the driver side is from above level, but it's obvious there is a large discrepancy. If you have the stock manifolds and the hear riser on the passenger side, that could explain the difference in clearance.
Most sidepipes like that do tend to hug the body pretty tight, and may even touch...just depends on the manufacturer. Imho, there is too much difference for this to be engine mount related. If it was that low on the passenger side(due to an engine mount issue), it seems like the dang fan would be clipping the fan shroud, and the steering linkage might be rubbing on the oil pan.
This looks to me more like just a set of pipes that are not bent/welded properly for the car. You can trim a little of the body off where the pipes are hitting, but will the rocker panel trim fit?
Most of the Mid Year Corvettes with sidewinders had to have the body cut right in that area from the factory for the pipes to clear. Don't know that I've ever heard about the same issue with the '69s, since they were the only Shark cars to come with factory sidepipes.
You might just need a torch, and stand on the pipe to get it to clear on the driver side, and maybe a little body trimming. The passengers side looks like there is way too much clearance on it....may be able to heat that side and jack it up a little closer. Just remember, even tho you have solid engine mounts, the engine is still gunna torque UP on the driver side, and down on the pass side.
hth

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Joel Adams
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1/7/13 4:27pm - Reply: 'Re: Engine Shims'
ROCKRDR
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Lakeside, AZ - USA

Vette(s):
1975 C3 Stingray

Joined: 7/23/2012
Posts: 126
The pipes are headers, not stock and I posted a while ago about the fan being too close to
the shroud on the pass side.

is there any way to verify engine alignment?


____________________________________
1975 Corvette Coupe 
My first Vette.....trying to fix stuff

My Project:
https://docs.google.com/folder/d/0B6uOAIjGf3cWejQ5TjNkcVRybGs/edit
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1/7/13 11:30pm - Reply: 'Re: Engine Shims'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
ROCKRDR said:  is there any way to verify engine alignment?


Not that I am aware of. THe only thing I could suggest would be to remove the carb, and set a level across the intake. The problem with that is, you would need to determine if the car itself was level....and I got no idea of how you could do that.
Ida know....you may try sticking a couple of flat washers between the mount and engine block on the pass side, and see if that makes the difference. I remember someone here stating that the solid mounts they used were different left/right....maybe yours are too?
Is there a chance that the frame might be a little tweeked on the car?



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Joel Adams
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1/8/13 12:22am - Reply: 'Re: Engine Shims'
ROCKRDR
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Lakeside, AZ - USA

Vette(s):
1975 C3 Stingray

Joined: 7/23/2012
Posts: 126
I read somewhere too,  to put a level across the intake which I did and the engine is listing 
to the drivers side quite a bit, the bubble wasn't even between the two lines.
the car might be a little "tweaked" as well still looking in to that.. but everything I have read 
said these care were pretty much sloppily glued together so I don't know if it was "fixed" or like this from the factory..
I think I'll try to put the washers in or some spacers, when I put the mounts in they were a real pita and I had to screw the bolts in part way on both sides and cinch it up tight. I'm thinkin that might be my issue.
The mounts were pretty much identical didn't seam like there was a left or right side.

well see, maybe it will come together. Censored




____________________________________
1975 Corvette Coupe 
My first Vette.....trying to fix stuff

My Project:
https://docs.google.com/folder/d/0B6uOAIjGf3cWejQ5TjNkcVRybGs/edit
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1/8/13 9:05am - Reply: 'Re: Engine Shims'
manchestershark Lifetime Member
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Equinunk, PA - USA

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1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 1895
 
How about BODY Mounts on the frame?  Are they sagging or crushed? Could be some of the low problem on one side.


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1/8/13 10:45am - Reply: 'Re: Engine Shims'
ROCKRDR
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Lakeside, AZ - USA

Vette(s):
1975 C3 Stingray

Joined: 7/23/2012
Posts: 126
I just installed new poly mounts, this last weekend Wacko

____________________________________
1975 Corvette Coupe 
My first Vette.....trying to fix stuff

My Project:
https://docs.google.com/folder/d/0B6uOAIjGf3cWejQ5TjNkcVRybGs/edit
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1/12/13 8:39pm - Reply: 'Re: Engine Shims'
73shark
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 382
I had to trim a little bit on both sides when putting them on.

You can also try loosening the rear attachment, then loosen front attachment and try to force down while tightening the front.  Then tighten rear.


____________________________________

1973 L-82 4 spd

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2/10/13 8:05pm - Reply: 'Re: Engine Shims'
tonytheroofer
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Rochester, NY - USA

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1980 L- 82 fully restored and upgraded.

Joined: 6/12/2012
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I would check ride height left to right and hope it is a spring was the car ever hit up front ?

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1980 , ZZ430 , 3.92 rear , 700R4 2400 stall NEW EZ EFI 
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2/11/13 1:44am - Reply: 'Re: Engine Shims'
ROCKRDR
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Lakeside, AZ - USA

Vette(s):
1975 C3 Stingray

Joined: 7/23/2012
Posts: 126
tonytheroofer said: I would check ride height left to right and hope it is a spring was the car ever hit up front ?

The more I look at and compare sides I believe it has, but I have no proof, This is my first Vette

I wouldn't think ride height (springs) should effect the fit, or am I thinking of something else?



____________________________________
1975 Corvette Coupe 
My first Vette.....trying to fix stuff

My Project:
https://docs.google.com/folder/d/0B6uOAIjGf3cWejQ5TjNkcVRybGs/edit
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2/11/13 1:46am - Reply: 'Re: Engine Shims'
ROCKRDR
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Lakeside, AZ - USA

Vette(s):
1975 C3 Stingray

Joined: 7/23/2012
Posts: 126
73shark said: I had to trim a little bit on both sides when putting them on.

You can also try loosening the rear attachment, then loosen front attachment and try to force down while tightening the front.  Then tighten rear.


are you talking about the mounts?

____________________________________
1975 Corvette Coupe 
My first Vette.....trying to fix stuff

My Project:
https://docs.google.com/folder/d/0B6uOAIjGf3cWejQ5TjNkcVRybGs/edit
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2/11/13 10:26pm - Reply: 'Re: Engine Shims'
73shark
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 382
ROCKRDR said:
73shark said: I had to trim a little bit on both sides when putting them on.

You can also try loosening the rear attachment, then loosen front attachment and try to force down while tightening the front.  Then tighten rear.


are you talking about the mounts?


No, I was referring to the side exhaust mounting points.


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1973 L-82 4 spd

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2/11/13 11:24pm - Reply: 'Re: Engine Shims'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
Jason, something I have been thinking aboot, but keep fergittin to ask..
When you put the new body mounts on, were there any shims on any of the mount locations? If so, are you certain you got them all back in the correct location? Seems like you had one corner that was way off, but we decided it was because you had the car in the air. I'm just wondering if you don't have a body mount shim that has gone missing, or something crazy like that, that could be causing the clearance issue with the pipes. Of course, it's entirely possible the pipes weren't welded exactly correct to begin with.
Just a couple of errant thoughts.....


____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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2/12/13 12:40am - Reply: 'Re: Engine Shims'
ROCKRDR
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Lakeside, AZ - USA

Vette(s):
1975 C3 Stingray

Joined: 7/23/2012
Posts: 126
Adams' Apple said: Jason, something I have been thinking aboot, but keep fergittin to ask..
When you put the new body mounts on, were there any shims on any of the mount locations? If so, are you certain you got them all back in the correct location? Seems like you had one corner that was way off, but we decided it was because you had the car in the air. I'm just wondering if you don't have a body mount shim that has gone missing, or something crazy like that, that could be causing the clearance issue with the pipes. Of course, it's entirely possible the pipes weren't welded exactly correct to begin with.
Just a couple of errant thoughts.....


I pulled and left the shims in the same area I took the mounts out of. funny the right side that is fine had very little shims, and the left side that is so low has pretty much 1/4 inch of shims at every mount. and before you ask :) the mounts were pretty corroded and mashed to think they had already been replaced.

the corner that was way off was the drivers far rear, and I did have jack stands in the middle of the car and one up front under the front brace, so the back was just hanging. I guess now that it is on the ground I could recheck that mount.

maybe I'll have to look into checking ride height body and frame. although my garage isnt perfectly level I dont know if I would fine 3/8 of an inch off Wacko
 


____________________________________
1975 Corvette Coupe 
My first Vette.....trying to fix stuff

My Project:
https://docs.google.com/folder/d/0B6uOAIjGf3cWejQ5TjNkcVRybGs/edit
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2/12/13 1:57pm - Reply: 'Re: Engine Shims'
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
Hmmmm....frustrating, to say the least!
I hate to say it, but it is beginning to sound more and more like the car may have been hit somewhere down the line, considering the fan shroud issue, and now this. The only other explanation would be the engine mounts are just not exactly right, for some reason. I'd have to go back and check the thread on the shroud, but was the fan/shroud out of alignment before you did the engine mounts?


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Joel Adams
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(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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