[DeTomaso] New Clutch Issues

[wkooiman at earthlink.net]

I've seen the same thing with fans.  When I was 16 we were next to a guy that was revving, maybe 5K rpm's and a blade came off the fan.  It went through the hood.


-----Original Message-----
>From: Rob Dumoulin <rob at dumoulins.net>
>Sent: Apr 6, 2010 11:52 AM
>To: sean mundy <seanmundy at hotmail.com>
>Cc: jderyke at aol.com, detomaso at realbig.com
>Subject: Re: [DeTomaso] New Clutch Issues
>
>Warning!  Flywheels do explode and cause cataclysmic carnage.  My best man
>had his break apart reving his 68 Z-28 in his driveway after tuning it.  It
>ripped the firewall and hood apart, broke the windshield, tore chunks out of
>his driveway, and a chunk ripped through the roof of a house a block away.
> Imagine what it would do to a ZF, deck lid, and  so close to a gas tank.
>
>The funny part was, it was in an Air Force town and the base got blamed for
>dropping a part off of one of their jets.  My buddy owned up to it and got
>on the news with his car.
>
>On Tue, Apr 6, 2010 at 12:33 PM, sean mundy <seanmundy at hotmail.com> wrote:
>
>>
>> Is there any balancing needed on the flywheel after grinding?
>>
>>
>>
>> From: JDeRyke at aol.com
>> Date: Tue, 6 Apr 2010 02:28:39 -0400
>> Subject: Re: [DeTomaso] New Clutch Issues
>> To: seanmundy at hotmail.com; detomaso at realbig.com
>>
>> In a message dated 4/5/10 8:54:59 PM, seanmundy at hotmail.com writes:
>>
>> It has 3 springs.  Not sure what type they are.....
>>
>> OK- so its a sprung disc. Dunno- maybe the disc didn't like the new surface
>> finish of the flywheel. If so, continued driving will smooth any slight
>> roughness or fill in any small depressions. Stock iron flywheels get
>> heat-treated in use, which can make extremely hard 'hot-spots' within the
>> mass of the flywheel. If the guy doing the sufacing isn't paying attention,
>> the grinding wheel will plane over the hard spots, polishing or burnishing
>> them but not cutting the surface at those points, or cutting more on one
>> side than another causing a degree of tilt. Such a flywheel will then cause
>> chatter. A leaking rear main seal or ZF front seal can deposit a few drops
>> of oil on the disc which is like a blotter as far as any fluid
>> contamination. Extremely dirty hands can do it. Again, the heat of use often
>> boils off the contaminates over time- if you can stand the chatter that
>> long!
>> Back when I was dirt-poor, I took contaminated clutch discs and brake pads,
>> and stuck them in a basin of carbon-tetrachloride for a few minutes, then
>> drip-dried them in the sun for a day. Those solvent-cleaned parts
>> subsequently worked just fine. Note this last "is for entertainment purposes
>> only. No recommendations are made etc, blah blah..." And depending on your
>> place of residence, it may be impossible to get good chlorinated
>> hydrocarbons for any sort of cleaning. There are other chatter causes, too.
>> Good luck- J DeRyke
>>
>>
>>
>>
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>
>
>-- 
>Rob DuMoulin
>904.476.8744
>rob at dumoulins.net
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