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Old 11-27-2020   #1
Corvette95
 
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Default 90 Motor Mounts and C-beam plates..anyway to do it WITHOUT removing manifolds?

I think I need to replace the stock motor mounts at 29k Miles, read through the stickies and prior threads. Is there ANY way to replace the motor mounts with the stock manifolds and cats (90) still in place? If I am going to pull the exhaust I think I may wait until the budget allows for a whole new exhaust system instead or re-installing the stock ones along with ZF-Docs C-beam plates. If I can do it with exhaust on, I would like to go ahead and replace the motor mounts and do the ZFDoc plates this week. Thanks.
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Last edited by Corvette95; 11-27-2020 at 06:51 PM.
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Old 11-27-2020   #2
Erik
 
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Default Re: 90 Motor Mounts and C-beam plates..anyway to do it WITHOUT removing manifolds?

Out of curiosity, why did you decide to do the C-beam plates?
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Old 11-28-2020   #3
secondchance
 
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Default Re: 90 Motor Mounts and C-beam plates..anyway to do it WITHOUT removing manifolds?

Even if you can unstable the c beam plate, you won?t be able to torque it correctly. Do it once and do it right.
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Old 11-28-2020   #4
Corvette95
 
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Default Re: 90 Motor Mounts and C-beam plates..anyway to do it WITHOUT removing manifolds?

Quote:
Originally Posted by secondchance View Post
Even if you can unstable the c beam plate, you won?t be able to torque it correctly. Do it once and do it right.
Can you follow up on that? I know I would need to pull the catback and I would for the C-beam plates but if I can going to do that I am going to replace the motor mounts and my question is if anyone has found a way to replace the motor mounts without removing the stock manifolds...if I am going to do that, I think I should waiting until I can buy headers, the stock manifold have never been off and I am sure they will need heat and probably break a stud or two.
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1989 C4 Conv Wht/Gry Auto Hardtop Top Flight SOLD
1995 C4 Coupe Purple/Blk 6 Speed
1989 C4 Conv Wht/Red Auto SOLD
1996 C4 Conv Black/Tan Auto SOLD
1994 C4 Coupe Wht/Blk SOLD
1995 C4 ZR-1 White/Gry #278 Dual Dunn Head SOLD
1986 C4 Coupe Black/Red 4+3 SOLD
1990 C4 ZR-1 Red/Red #0454
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Old 11-28-2020   #5
32valvZ
 
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Default Re: 90 Motor Mounts and C-beam plates..anyway to do it WITHOUT removing manifolds?

Just for the record...Ive done headers on 2 different Zs now.... I didnt need heat or break anything and was able to get all but maybe 2 bolts back in.
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[B]1990 #2815[/B]
[COLOR="Red"][B]Red/Red[/B][/COLOR]
Ported Plenum & IH (by Pete)
Haibeck Chip
Rebuilt FPR (by Phil)
FIC Injectors
Watson LT Headers
3" Stainless Works exhaust
Lingenfelter Open Air Lid
Bill B Built Transmission
Shifter & C Beam Plates


[FONT=Impact][COLOR=red]1992 [COLOR=black]#[/COLOR] 091[/COLOR][/FONT]
[FONT=Impact][COLOR=#ff0000]Red/[COLOR=silver]Gray[/COLOR][/COLOR][/FONT]
[B]SOLD[/B]
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Old 11-28-2020   #6
secondchance
 
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Default Re: 90 Motor Mounts and C-beam plates..anyway to do it WITHOUT removing manifolds?

I don?t know positively if motor mounts can be replaced with stock exhaust manifold. Also, 94 and 95s have EGR on the passenger side which might add to the challenge.
As for the C beam plate bolts, exhaust location is such that getting torque wrench on the bolt is impossible. Ironically, my c beam bolts were loose and really didn?t want to drop the exhaust. Jim, Wazoo chief, had a 3/8? drive stub with hex head on it. I used 18mm socket, hex bolt head stud and ratcheting box wrench combo to tighten it. Did I get 40 point foot? Probably not but close I hope.
When installing c beam plate, strongly recommend Locktite.
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Old 11-28-2020   #7
Corvette95
 
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Default Re: 90 Motor Mounts and C-beam plates..anyway to do it WITHOUT removing manifolds?

Quote:
Originally Posted by 32valvZ View Post
Just for the record...Ive done headers on 2 different Zs now.... I didnt need heat or break anything and was able to get all but maybe 2 bolts back in.
Did you remove the air tubes before the manifolds or were you able to pull them as a unit?
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1989 C4 Conv Wht/Gry Auto Hardtop Top Flight SOLD
1995 C4 Coupe Purple/Blk 6 Speed
1989 C4 Conv Wht/Red Auto SOLD
1996 C4 Conv Black/Tan Auto SOLD
1994 C4 Coupe Wht/Blk SOLD
1995 C4 ZR-1 White/Gry #278 Dual Dunn Head SOLD
1986 C4 Coupe Black/Red 4+3 SOLD
1990 C4 ZR-1 Red/Red #0454
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Old 11-29-2020   #8
32valvZ
 
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Default Re: 90 Motor Mounts and C-beam plates..anyway to do it WITHOUT removing manifolds?

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Originally Posted by Corvette95 View Post
Did you remove the air tubes before the manifolds or were you able to pull them as a unit?
Removed all together.
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[B]1990 #2815[/B]
[COLOR="Red"][B]Red/Red[/B][/COLOR]
Ported Plenum & IH (by Pete)
Haibeck Chip
Rebuilt FPR (by Phil)
FIC Injectors
Watson LT Headers
3" Stainless Works exhaust
Lingenfelter Open Air Lid
Bill B Built Transmission
Shifter & C Beam Plates


[FONT=Impact][COLOR=red]1992 [COLOR=black]#[/COLOR] 091[/COLOR][/FONT]
[FONT=Impact][COLOR=#ff0000]Red/[COLOR=silver]Gray[/COLOR][/COLOR][/FONT]
[B]SOLD[/B]
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Old 11-29-2020   #9
Corvette95
 
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Default Re: 90 Motor Mounts and C-beam plates..anyway to do it WITHOUT removing manifolds?

Quote:
Originally Posted by 32valvZ View Post
Removed all together.
Thanks, about to start the job, any tips on removing the heat shields? Can any be left in place? Any special tools tips for access to prevent slicing up my hands? I plan on removing the entire exhaust as one piece from headers to mufflers, FSM says that is ok?
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Corvette95 Registry and Forum (*************)
1989 C4 Conv Wht/Gry Auto Hardtop Top Flight SOLD
1995 C4 Coupe Purple/Blk 6 Speed
1989 C4 Conv Wht/Red Auto SOLD
1996 C4 Conv Black/Tan Auto SOLD
1994 C4 Coupe Wht/Blk SOLD
1995 C4 ZR-1 White/Gry #278 Dual Dunn Head SOLD
1986 C4 Coupe Black/Red 4+3 SOLD
1990 C4 ZR-1 Red/Red #0454
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Old 11-29-2020   #10
32valvZ
 
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Default Re: 90 Motor Mounts and C-beam plates..anyway to do it WITHOUT removing manifolds?

Quote:
Originally Posted by Corvette95 View Post
Thanks, about to start the job, any tips on removing the heat shields? Can any be left in place? Any special tools tips for access to prevent slicing up my hands? I plan on removing the entire exhaust as one piece from headers to mufflers, FSM says that is ok?
I dont think you will be able to remove the entire exhaust with the manifolds attached.. I would separate the exhaust from the manifolds back. All that can come out as one piece. I remember having to finagle the manifolds around a little to get them out and I cant see doing that with them attached to the rest of the exhaust.

Im not sure what your working circumstances are.... but I guess you can try if you have a lift that you can stand up underneath. I only have a Kwiklift so maybe thats why it seems easier to separate...
__________________
[B]1990 #2815[/B]
[COLOR="Red"][B]Red/Red[/B][/COLOR]
Ported Plenum & IH (by Pete)
Haibeck Chip
Rebuilt FPR (by Phil)
FIC Injectors
Watson LT Headers
3" Stainless Works exhaust
Lingenfelter Open Air Lid
Bill B Built Transmission
Shifter & C Beam Plates


[FONT=Impact][COLOR=red]1992 [COLOR=black]#[/COLOR] 091[/COLOR][/FONT]
[FONT=Impact][COLOR=#ff0000]Red/[COLOR=silver]Gray[/COLOR][/COLOR][/FONT]
[B]SOLD[/B]

Last edited by 32valvZ; 11-29-2020 at 09:30 AM.
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