Motor mount swap questions - ZR-1 Net Registry Forums

VetteMed · 06-21-2011

I don't think too many folks have changed motor mounts on their Zs, but I have been wondering if the lack of clearance between the #1 header tube and the steering shaft is due to sagging mounts, being that my car has a lot of miles on it. Now, I should have changed the mounts when the headers were off, but I didn't -- so now I'm left with wondering if I'm going to need to pull the headers off in order to change out the mounts or not. Does anyone know if it's doable with the headers (Jeal) in place?

Edit:
It's not doable. Pulling the headers is really not that bad of a job, and it gave the access needed to do this job properly. See later in thread for pics of mounts and more commentary.

LGAFF · 06-21-2011

Seems like it would easy to unbolt the mounts and jack up the engine with a thick board under the oil pan

VetteMed · 06-21-2011

Lee, that's what I was hoping for, I guess I just don't remember how much access there is to the upper bolts. Thanks.

LGAFF · 06-21-2011

Manual says both can be removed by jacking up engine...no header removal.

VetteMed · 06-21-2011

nice! I didn't think to check the FSM.

Thanks again Lee!
-Andrew

LGAFF · 06-21-2011

have to take that back...that was L98....LT-5 says exhaust manifold comes off for both sides

VetteMed · 06-21-2011

Quote:

Originally Posted by LGAFF

have to take that back...that was L98....LT-5 says exhaust manifold comes off for both sides

Well, that's typical for the way things have gone lately... oh well.

LGAFF · 06-21-2011

headers might be a different story, a lot more room in there

VetteMed · 06-21-2011

Yeah, I just looked at the driver's side, might be doable. Can't tell on the passenger side just from looking from above. Might take some creative use of extensions and wrenches.

A26B · 06-22-2011

Don't forget the C-beam is attached, making the whole driveline one rigid unit. Jacking up the engine with the c-beam still secured could damage the c-beam or trans. When I tried jacking the engine with all attached, it acted like the motor mounts were still bolted to the frame. I suggest removing the c-beam before trying to jack the engine up. Does the service manual mention anything about that?

06-21-2011	#2
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,186	Re: Motor mount swap questions Seems like it would easy to unbolt the mounts and jack up the engine with a thick board under the oil pan __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

06-21-2011	#3
VetteMed Join Date: Mar 2009 Location: Ocala, FL Posts: 1,827	Re: Motor mount swap questions Lee, that's what I was hoping for, I guess I just don't remember how much access there is to the upper bolts. Thanks. __________________ No fun cars :( 1991 ZR-1 #302 White/Gray (sold) 1991 ZR-1 #1147 Red/Saddle (sold)

06-21-2011	#4
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,186	Re: Motor mount swap questions Manual says both can be removed by jacking up engine...no header removal. __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

06-21-2011	#5
VetteMed Join Date: Mar 2009 Location: Ocala, FL Posts: 1,827	Re: Motor mount swap questions nice! I didn't think to check the FSM. Thanks again Lee! -Andrew __________________ No fun cars :( 1991 ZR-1 #302 White/Gray (sold) 1991 ZR-1 #1147 Red/Saddle (sold)

06-21-2011	#6
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,186	Re: Motor mount swap questions have to take that back...that was L98....LT-5 says exhaust manifold comes off for both sides __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

06-21-2011	#1
VetteMed Join Date: Mar 2009 Location: Ocala, FL Posts: 1,827	Motor mount swap questions I don't think too many folks have changed motor mounts on their Zs, but I have been wondering if the lack of clearance between the #1 header tube and the steering shaft is due to sagging mounts, being that my car has a lot of miles on it. Now, I should have changed the mounts when the headers were off, but I didn't -- so now I'm left with wondering if I'm going to need to pull the headers off in order to change out the mounts or not. Does anyone know if it's doable with the headers (Jeal) in place? Edit: It's not doable. Pulling the headers is really not that bad of a job, and it gave the access needed to do this job properly. See later in thread for pics of mounts and more commentary. __________________ No fun cars :( 1991 ZR-1 #302 White/Gray (sold) 1991 ZR-1 #1147 Red/Saddle (sold) Last edited by VetteMed; 06-23-2011 at 08:15 PM.

06-21-2011	#8
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,186	Re: Motor mount swap questions headers might be a different story, a lot more room in there __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

06-21-2011	#9
VetteMed Join Date: Mar 2009 Location: Ocala, FL Posts: 1,827	Re: Motor mount swap questions Yeah, I just looked at the driver's side, might be doable. Can't tell on the passenger side just from looking from above. Might take some creative use of extensions and wrenches. __________________ No fun cars :( 1991 ZR-1 #302 White/Gray (sold) 1991 ZR-1 #1147 Red/Saddle (sold)

06-22-2011	#10
A26B Join Date: Dec 2003 Location: Arcadia,OK Posts: 3,372	Re: Motor mount swap questions Don't forget the C-beam is attached, making the whole driveline one rigid unit. Jacking up the engine with the c-beam still secured could damage the c-beam or trans. When I tried jacking the engine with all attached, it acted like the motor mounts were still bolted to the frame. I suggest removing the c-beam before trying to jack the engine up. Does the service manual mention anything about that? __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.