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What would cause these flywheel surface cracks? by David Hambleton
Started on: 11-04-2013 05:59 PM
Replies: 9 (657 views)
Last post by: Francis T on 11-05-2013 01:55 PM
David Hambleton
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Report this Post11-04-2013 05:59 PM Click Here to See the Profile for David HambletonSend a Private Message to David HambletonEdit/Delete MessageReply w/QuoteDirect Link to This Post
This is a 1986 2.5L flywheel with lots of surface cracks. Could they be caused by someone slipping the clutch a lot?
Three of the disc rivets were rubbing on the pressure plate; making a burnished circle on the plate.
I got this car with 107,000 kilometers (66,500 miles) on it, have added another 12,000 kms and am surprised the clutch is worn out. I dropped the engine to replace it due to a death rattle, not clutch issues...

It's a Borg & Beck clutch so I presume it's original.

My 84 SE I've had since new still has the original clutch at 362,000 kilometers (225,000 miles).
Maybe I should see if there's anything left of it!

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Report this Post11-04-2013 07:46 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
I think that is caused by a lot of heat. Maybe the PO was riding the clutch.
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cmechmann
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Report this Post11-04-2013 09:26 PM Click Here to See the Profile for cmechmannSend a Private Message to cmechmannEdit/Delete MessageReply w/QuoteDirect Link to This Post
Yeah he's right, heat does that. 4cyls tend to be more noticable due more feathering. It will have to be machined before replacing the clutch. Or it will chatter badly.
Both the raised surface and the outer area need to be machined the same amount. Looks like you are going to need at least .015 to get the heat checking out.

[This message has been edited by cmechmann (edited 11-04-2013).]

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David Hambleton
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Report this Post11-04-2013 09:40 PM Click Here to See the Profile for David HambletonSend a Private Message to David HambletonEdit/Delete MessageReply w/QuoteDirect Link to This Post
That engine is staying out; it has a death rattle over 2500 rpm when not under load.
I'm replacing it with an '87 2.5L. Not a very exotic swap...
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cmechmann
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Report this Post11-04-2013 09:45 PM Click Here to See the Profile for cmechmannSend a Private Message to cmechmannEdit/Delete MessageReply w/QuoteDirect Link to This Post
Sorry I didn't recognize the name at first. Eyes are going to.
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Neils88
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Report this Post11-04-2013 09:57 PM Click Here to See the Profile for Neils88Send a Private Message to Neils88Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by David Hambleton:

That engine is staying out; it has a death rattle over 2500 rpm when not under load.
I'm replacing it with an '87 2.5L. Not a very exotic swap...


If you want a more exotic swap, I have an '88 2.5L sitting in my garage...
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David Hambleton
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Report this Post11-04-2013 10:08 PM Click Here to See the Profile for David HambletonSend a Private Message to David HambletonEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Neils88:


If you want a more exotic swap, I have an '88 2.5L sitting in my garage...


I understand the '87 vintage is the more desirable - no worries about the balance shaft issue.
Oddly enough, the engine came from Val-des-Monts - not too far from you - from a guy with a 4.9 Fiero!

[This message has been edited by David Hambleton (edited 11-04-2013).]

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theogre
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Report this Post11-04-2013 11:52 PM Click Here to See the Profile for theogreClick Here to visit theogre's HomePageSend a Private Message to theogreEdit/Delete MessageReply w/QuoteDirect Link to This Post
You need to replace that...
Scrap iron price is only thing left of value.

A weak pressure plate, sticky TO bearing or level can do that.

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David Hambleton
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Report this Post11-05-2013 12:22 PM Click Here to See the Profile for David HambletonSend a Private Message to David HambletonEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by theogre:

You need to replace that...
Scrap iron price is only thing left of value.

A weak pressure plate, sticky TO bearing or level can do that.


 
quote
Originally posted by David Hambleton:

That engine is staying out; it has a death rattle over 2500 rpm when not under load.
I'm replacing it with an '87 2.5L. Not a very exotic swap...

[This message has been edited by David Hambleton (edited 11-05-2013).]

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Francis T
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Report this Post11-05-2013 01:55 PM Click Here to See the Profile for Francis TClick Here to visit Francis T's HomePageSend a Private Message to Francis TEdit/Delete MessageReply w/QuoteDirect Link to This Post
Could be like someone likes to drag the clutch too much, perhaps maybe a lover of burnouts. Though I've never heard of it happening to a Fiero, if the crcks get bad enough the flywheel can explode and TAKE THE WHOLE CAR AND MAYBE YOU WITH IT.

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