Tech / General Engine Is your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!
Sponsored by:
Sponsored by: CARiD

how strong are stock motor mounts

Thread Tools
 
Search this Thread
 
Old Apr 24, 2008 | 03:09 PM
  #1  
kowboy59's Avatar
Thread Starter
Supreme Member
iTrader: (8)
 
Joined: Dec 2004
Posts: 1,153
Likes: 0
From: kissimmee fl
Car: 88 iroc-z z-28
Engine: 383
Transmission: th400
Axle/Gears: 3.42
how strong are stock motor mounts

I was just curious if I was really in need of changing them. They look in great shape, and I am pretty lost on knowing how to get them out. Plus if I can save a little cash it would be great. My mo tor is out and I am bout to put the new one in so this is why im asking.
Reply
Old Apr 24, 2008 | 03:31 PM
  #2  
Orr89RocZ's Avatar
Supreme Member
20 Year Member
Liked
Loved
Community Favorite
iTrader: (20)
 
Joined: Sep 2003
Posts: 25,895
Likes: 429
From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: how strong are stock motor mounts

you mean the stock clamshells and bracket or the bushing?

either way, the stock mounts are pretty strong... strong enough for that 383 your making

stock bushings should be replaced but if they look ok, you can reuse them. I went with new poly mounts just to replace the stock 160K mile units
Reply
Old Apr 24, 2008 | 05:13 PM
  #3  
Sonix's Avatar
Supreme Member
iTrader: (1)
 
Joined: Jul 2004
Posts: 10,763
Likes: 4
From: Calgary, AB, Canada
Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
Re: how strong are stock motor mounts

stick your stock bolt through the rubber mount and wiggle it with your hand. See how much play they have. It's hard to see visually if they are torn up or not.
If they are, stock replacements are $20 per when I did mine. Or poly ones are about $40 per I think? They're a bear to get to, but not too bad with the engine out. Hope they are ok as is.
Reply
Old Apr 24, 2008 | 05:27 PM
  #4  
kowboy59's Avatar
Thread Starter
Supreme Member
iTrader: (8)
 
Joined: Dec 2004
Posts: 1,153
Likes: 0
From: kissimmee fl
Car: 88 iroc-z z-28
Engine: 383
Transmission: th400
Axle/Gears: 3.42
Re: how strong are stock motor mounts

From what I can see and touch they are in great condition. I was talking about the rubber piece. I had 2 buddies check and they said theyre fine. I was just makin sure. Thanks guys
Reply
Old Apr 24, 2008 | 05:32 PM
  #5  
five7kid's Avatar
Moderator
25 Year Member
iTrader: (14)
 
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
They're not fine. They're rubber. Meaning they flex and deteriorate.

Replace them with poly inserts while the replacing is easy.
Reply
Old Apr 24, 2008 | 07:46 PM
  #6  
cooter26's Avatar
Member
iTrader: (1)
 
Joined: May 2007
Posts: 247
Likes: 0
From: Gulfport MS
Car: 83 Camaro
Engine: 383
Transmission: T5
Axle/Gears: 4th gen 10 bolt 3:42 POSI
Re: how strong are stock motor mounts

Please save yourself the hassle later when u start it up and your headers hit your steering shaft and the engine moves like an unbalanced washing machine.
I had a post on here asking how to get to the bolts on mine.
Reply
Old Apr 24, 2008 | 09:20 PM
  #7  
kowboy59's Avatar
Thread Starter
Supreme Member
iTrader: (8)
 
Joined: Dec 2004
Posts: 1,153
Likes: 0
From: kissimmee fl
Car: 88 iroc-z z-28
Engine: 383
Transmission: th400
Axle/Gears: 3.42
Re: how strong are stock motor mounts

And how would I be able to find yours? I searched and found nothing too helpful. You have a link by chance?
Reply
Old Apr 25, 2008 | 02:02 PM
  #8  
cooter26's Avatar
Member
iTrader: (1)
 
Joined: May 2007
Posts: 247
Likes: 0
From: Gulfport MS
Car: 83 Camaro
Engine: 383
Transmission: T5
Axle/Gears: 4th gen 10 bolt 3:42 POSI
Re: how strong are stock motor mounts

Ok, i found my post but it wont help you much. On the bottom part of the mount, the part attached to the k-member there are 3 bolts holding it on #15 metric i think. The problem is the nuts are inside the k-member. To get to them i had to take the wheels off, disconnect the tie rod at the spindle and the shock, pop the a-arm down out of the spindle, take off the a-arm and spring. Now is a good time to install some pollyurethane bushings in your a-arms and check the condition of your shocks and upper and lower ball joints. once thats out of the way its easy to get to the 3 nuts. You might have the necessary extentions and swivels to do it with out removing anything but the wheels, but i couldnt. Now you have a few options on motormounts. They sell solid mounts but then the vibration from the motor wont be dampened, you could use new stock mounts or polyurethane, they sell just rubber or pollyurethane part that you have to drill out the rivets in the lower mount and replace them with the bolts included in the kit.

On a side note go trough everything you can before the motor goes in, i had to lift mine up 5 or 6 times already because i rushed.

Good Luck
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Jeremys87
Electronics
16
Jul 14, 2022 09:08 PM
TreDeClaw
Theoretical and Street Racing
11
Jun 22, 2021 08:21 PM
Elliswon
LTX and LSX
4
Aug 10, 2015 12:33 PM
mustangman65_79
Tech / General Engine
4
Aug 8, 2015 01:18 AM
NBrehm
Engine/Drivetrain/Suspension Parts for Sale
0
Aug 5, 2015 07:57 PM




All times are GMT -5. The time now is 10:48 PM.