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Next time your under your car check your mounts by Edwin
Started on: 10-11-2014 09:22 PM
Replies: 9 (354 views)
Last post by: dbober on 10-15-2014 09:54 PM
Edwin
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Report this Post10-11-2014 09:22 PM Click Here to See the Profile for EdwinClick Here to Email EdwinSend a Private Message to EdwinEdit/Delete MessageReply w/QuoteDirect Link to This Post
Not sure this is a common thing or not but check your mounts the next time your under your car.
Even though i didnt notice anything while driving mine were actually pretty bad.
After replacing them some time ago i noticed this time the right side engine mounting bracked (not the rubber mount itself) was cracked pretty bad.
Its pretty hard to see when the mount is dirty but 2/3 of it was broken. Hard to see even in the pictures but it actually moved about 1 mm at the end of the crack and the bracket has a slight bend in it.
PS it looks pretty easy to replace at first glance but it is a pain to get it out
But its welded now and good to go!

its right under the bolt.


on the right side here


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Raydar
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Report this Post10-12-2014 12:56 PM Click Here to See the Profile for RaydarClick Here to Email RaydarSend a Private Message to RaydarEdit/Delete MessageReply w/QuoteDirect Link to This Post
That looks like an 88 V6 mount.
I have heard of several of them cracking, but your thread is a good reminder. Thanks for sharing.
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GreenPlatypus
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Report this Post10-12-2014 01:17 PM Click Here to See the Profile for GreenPlatypusClick Here to Email GreenPlatypusSend a Private Message to GreenPlatypusEdit/Delete MessageReply w/QuoteDirect Link to This Post
I've welded a couple back together, 3 or 4. One had split completely. I never did find the culprit that lead up to the failure. All were 88's.
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Raydar
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Report this Post10-12-2014 01:56 PM Click Here to See the Profile for RaydarClick Here to Email RaydarSend a Private Message to RaydarEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by GreenPlatypus:
I never did find the culprit that lead up to the failure.


I suspect it's just a design feature.
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hookdonspeed
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Report this Post10-12-2014 06:19 PM Click Here to See the Profile for hookdonspeedClick Here to visit hookdonspeed's HomePageClick Here to Email hookdonspeedSend a Private Message to hookdonspeedEdit/Delete MessageReply w/QuoteDirect Link to This Post
always good to know hard to find 88 parts seem to break
time for an engine swap
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Chelo Fiero
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Report this Post10-12-2014 08:34 PM Click Here to See the Profile for Chelo FieroClick Here to visit Chelo Fiero's HomePageClick Here to Email Chelo FieroSend a Private Message to Chelo FieroEdit/Delete MessageReply w/QuoteDirect Link to This Post
The 88 cars don't have the drive line absorbers, so they rely on the dogbone mount to minimize the forth to back movement.
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Edwin
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Report this Post10-15-2014 07:33 PM Click Here to See the Profile for EdwinClick Here to Email EdwinSend a Private Message to EdwinEdit/Delete MessageReply w/QuoteDirect Link to This Post
The bracket is indeed from an 88 i forgot to mention, well spotted! But then i didnt know this is an 88 thing.
I'm not sure the dogbone could be the cause for this tho, i would imagine sideways motions from the engine would cause fatique on the bracket this way, not back and forth?
Perhaps worn left side engine mounts? Not that i know much about metal fatique tho

[This message has been edited by Edwin (edited 10-15-2014).]

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dbober
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Report this Post10-15-2014 08:23 PM Click Here to See the Profile for dboberClick Here to visit dbober's HomePageSend a Private Message to dboberEdit/Delete MessageReply w/QuoteDirect Link to This Post
Common problem with the 1988 V6 and 5-Speed transmission and lead foot driving. Replaced mine several years ago with a salvage yard part but kept the cracked one. Next time I'll get it welded. Replaced the upper dogbone mount with a Fiero Store steel and polyurethane mount and haven't cracked one since. Keep in mind, I primarily autocross my car, which does stress the drive line.

A friend of my owned Todd Rupp's 1988 Fiero Formula for three years and his had been replaced too. That car was an SCCA Nationally competitive car.

http://www.team.net/archive...000-06/msg00275.html
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Patrick
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Report this Post10-15-2014 08:51 PM Click Here to See the Profile for PatrickClick Here to Email PatrickSend a Private Message to PatrickEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by dbober:

Replaced the upper dogbone mount with a Fiero Store steel and polyurethane mount and haven't cracked one since. Keep in mind, I primarily autocross my car, which does stress the drive line.


I was given one of those and installed it on my '88 Formula, which I also autocross. I was afraid that because it was so stiff, that it would actually contribute to factory motor (and/or tranny) mounts breaking, not prevent it. So I took it off and put back the stock dogbone.

[This message has been edited by Patrick (edited 10-15-2014).]

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dbober
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Report this Post10-15-2014 09:54 PM Click Here to See the Profile for dboberClick Here to visit dbober's HomePageSend a Private Message to dboberEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Patrick:

I was given one of those and installed it on my '88 Formula, which I also autocross. I was afraid that because it was so stiff, that it would actually contribute to factory motor (and/or tranny) mounts breaking, not prevent it. So I took it off and put back the stock dogbone.



That was a concern of mine too, but so far, no issues. I think I replaced that in 2005? Not sure. I do plan on replacing the rubber motor and tranny mounts next year, they are original.

I think by stabilizing the top of the motor, you relieve a lot of twist/torque stress on that bottom motor mount. But that's just a theory.
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