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John,
I saw the GT6 axle damage when we were strolling the paddock. We did =
not connect but I did get to see your final race. I hope to race at =
Schenley park someday =E2=80=94 looks like a fun track.
Duncan
(Texas)
> On Jul 21, 2015, at 9:25 AM, John Styduhar <johnstydo@gmail.com> =
wrote:
>=20
> While we are on GT6 drive train woes, the GT6 of James Dolan broke the =
driver's side axle at the Pittsburgh Vintage GP. Sheared right off at =
the brake backing plate. The axle diameter looks uncomfortably small. =
Didn't look like any body damage fortunately. I believe this is the =
historic Group 44 GT6. The Kastner GT6 of Brian Dolan was also there =
and racing well. =20
>=20
> On Mon, Jul 20, 2015 at 10:38 AM, Jason Ostrowski =
> Wow, I have not seen that happen before. For me, Usually it's ring and =
pinion, which often destroys the case.=20
> In terms of bearings, We have always used good looking and working =
original stock ones as well. I suspect this one just went as a result of =
an high revving extreme load under the conditions you describe. As =
knowing your attention to setup details are spot on the factory manual =
methods. That is our way too (less the welded spider gear). I think it's =
just a failure more racing related which just happens when you are =
trying to go fast and shows you are doing a good job of trying to drive =
harder ( can't be mad about that).=20
>=20
> I've been told by some of the best that the 4 bolt spring attachment =
is fine and will be fine. Yet I agree with you completely and feel that =
the 6 studs are necessary and a proper choice for the GT6.=20
> Thanks for the update.
> Keep doing what you have been doing with the differential.=20
> And maybe it's best to just try to keep it in third for the descent =
and shift again way later. Just use second (if you must) after a nice =
blip once you are all slowed down and ready to accelerate again.=20
> Jason Ostrowski
> Friendly Ghost Racing
>=20
> Sent from my iPhone
>=20
> On Jul 20, 2015, at 7:08 AM, Scott Janzen <sjanzen@me.com =
>=20
>> Bearings are what was in it. If bearings look good/feel good, I tend =
not to replace them. Figure old used stock is probably best, but maybe =
not. Pre- load, always suspect. The diff I have "ready" to put in is =
going to be disassembled and reassembled just to confirm. Shims and =
spacers at the ready - !
>>=20
>> Sent from my mobile device=20
>>=20
>> On Jul 20, 2015, at 7:58 AM, fubog1 <fubog1@aol.com =
>>=20
>> Scott I realize it's after the fact, and that thing is pretty torn =
up, so I'm a little hesitant to speculate... but when you rebuild it =
make sure NOT to use the crap bearings on the market, Timken only, and =
make sure the preload is correct...
>> Glen
>>=20
>>=20
>> -----Original Message-----
>> To: 'Friends of Triumph' Triumph <fot@autox.team.net =
>> Sent: Sun, Jul 19, 2015 6:54 pm
>> Subject: [Fot] GT6 differential failure follow-up
>>=20
>> Pulled my differential out and apart today - did not find what I =
expected. =20
>> The input/pinion shaft is sheared off just forward of the pinion =
gear. =20
>> The crown wheel has barely a mark on it, all teeth intact, no signs =
of damage.
>> The inner tapered bearing race on the pinion shaft is just mangled =
and there are roller bearings all over the place. However, the outer =
races for both pinion bearings look fine - no sign of discoloration or =
overheating, significant damage, etc.
>> It did fail when I was decelerating in second gear at high RPMs down =
the steep downhill on the new course in Pittsburgh, so the engine =
promptly slowed down - still, amazingly, there is minimal sign of =
rotational damage to the driveshaft - just a couple of paint scrapes. =
It was essentially unsecured at the rear, but perhaps the outer/forward =
pinion bearing kept it centered.
>> Both the shaft and the gear rubbed against each other so much there's =
no way to see any fracture marks.
>> One of the four bolts securing the spring to the top of the =
differential had cracked the housing, and it clearly leaked some oil =
there, but judging by the lack of oil on the underside of the car, I =
don't think this contributed to the failure. I had just topped it up =
before the weekend, and there was no sign of oil under the car =
throughout the weekend. Guess I'll be tapping the next diff for two =
more bolts, so there are six securing the spring next time.
>>=20
>> Photos attached. <FullSizeRender.jpg>
>>=20
>> <FullSizeRender.jpg>
>>=20
>> <FullSizeRender.jpg>
>> _______________________________________________
>> fot@autox.team.net <>
>>=20
>> http://www.fot-racing.com <>
>>=20
>> Donate:
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>> Unsubscribe/Manage:
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>>=20
>>=20
>> _______________________________________________
>>=20
>> http://www.fot-racing.com <http://www.fot-racing.com/>
>>=20
>> Donate: http://www.team.net/donate.html =
<http://www.team.net/donate.html>
>> Archive: http://www.team.net/archive <http://www.team.net/archive>
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>> Unsubscribe/Manage: =
http://autox.team.net/mailman/options/fot/jason@multivintage.com =
<http://autox.team.net/mailman/options/fot/jason@multivintage.com>
>>=20
>>=20
>=20
> _______________________________________________
>=20
> http://www.fot-racing.com <http://www.fot-racing.com/>
>=20
> Donate: http://www.team.net/donate.html =
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> Unsubscribe/Manage: =
http://autox.team.net/mailman/options/fot/johnstydo@gmail.com =
<http://autox.team.net/mailman/options/fot/johnstydo@gmail.com>
>=20
>=20
>=20
>=20
> _______________________________________________
> fot@autox.team.net
>=20
> http://www.fot-racing.com
>=20
> Donate: http://www.team.net/donate.html
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>=20
>=20
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Content-Transfer-Encoding: quoted-printable
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">John,<div class=3D""><br class=3D""><div class=3D"">I saw the =
GT6 axle damage when we were strolling the paddock. We did not =
connect but I did get to see your final race. I hope to race at =
Schenley park someday =E2=80=94 looks like a fun track.</div><div =
class=3D""><br class=3D""></div><div class=3D"">Duncan</div><div =
class=3D"">(Texas)</div><div class=3D""><br class=3D""><div><blockquote =
type=3D"cite" class=3D""><div class=3D"">On Jul 21, 2015, at 9:25 AM, =
John Styduhar <<a href=3D"mailto:johnstydo@gmail.com"; =
class=3D"">johnstydo@gmail.com</a>> wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div dir=3D"ltr" =
class=3D""><div class=3D"gmail_default" style=3D"font-size:small">While =
we are on GT6 drive train woes, the GT6 of James Dolan broke the =
driver's side axle at the Pittsburgh Vintage GP. Sheared right off at =
the brake backing plate. The axle diameter looks uncomfortably =
small. Didn't look like any body damage fortunately. I believe =
this is the historic Group 44 GT6. The Kastner GT6 of Brian Dolan =
was also there and racing well. </div></div><div =
class=3D"gmail_extra"><br class=3D""><div class=3D"gmail_quote">On Mon, =
Jul 20, 2015 at 10:38 AM, Jason Ostrowski <span dir=3D"ltr" =
class=3D""><<a href=3D"mailto:jason@multivintage.com"; target=3D"_blank"=
class=3D"">jason@multivintage.com</a>></span> wrote:<br =
class=3D""><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 =
.8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"auto" =
class=3D""><div class=3D"">Wow, I have not seen that happen before. For =
me, Usually it's ring and pinion, which often destroys the =
case. </div><div class=3D"">In terms of bearings, We have always =
used good looking and working original stock ones as well. I suspect =
this one just went as a result of an high revving extreme load under the =
conditions you describe. As knowing your attention to setup details are =
spot on the factory manual methods. That is our way too (less the welded =
spider gear). I think it's just a failure more racing related which just =
happens when you are trying to go fast and shows you are doing a good =
job of trying to drive harder ( can't be mad about =
that). </div><div class=3D""><br class=3D""></div><div =
class=3D"">I've been told by some of the best that the 4 bolt spring =
attachment is fine and will be fine. Yet I agree with you completely and =
feel that the 6 studs are necessary and a proper choice for the =
GT6. </div><div class=3D"">Thanks for the update.</div><div =
class=3D"">Keep doing what you have been doing with the =
differential. </div><div class=3D"">And maybe it's best to just try =
to keep it in third for the descent and shift again way later. Just use =
second (if you must) after a nice blip once you are all slowed down and =
ready to accelerate again. </div><div class=3D"">Jason =
Ostrowski</div><div class=3D"">Friendly Ghost Racing</div><div =
class=3D""><br class=3D"">Sent from my iPhone</div><div class=3D""><div =
class=3D"h5"><div class=3D""><br class=3D"">On Jul 20, 2015, at 7:08 AM, =
Scott Janzen <<a href=3D"mailto:sjanzen@me.com"; target=3D"_blank" =
class=3D"">sjanzen@me.com</a>> wrote:<br class=3D""><br =
class=3D""></div><blockquote type=3D"cite" class=3D""><div class=3D""><div=
class=3D"">Bearings are what was in it. If bearings look =
good/feel good, I tend not to replace them. Figure old used stock is =
probably best, but maybe not. Pre- load, always suspect. The =
diff I have "ready" to put in is going to be disassembled and =
reassembled just to confirm. Shims and spacers at the ready - !<br =
class=3D""><br class=3D"">Sent from my mobile device </div><div =
class=3D""><br class=3D"">On Jul 20, 2015, at 7:58 AM, fubog1 <<a =
href=3D"mailto:fubog1@aol.com"; target=3D"_blank" =
class=3D"">fubog1@aol.com</a>> wrote:<br class=3D""><br =
class=3D""></div><div class=3D""><font size=3D"2" face=3D"Arial, =
Helvetica, sans-serif" class=3D"">
<div class=3D""> Sc<font size=3D"2" class=3D"">ott I realize it's after =
the fact, and that thing is pretty torn up,
so I'm a little hesitant to speculate... but when you rebuild it make=20=
sure NOT to use the crap bearings on the market, Timken only, and make=20=
sure the preload is correct...<br class=3D"">
Glen<br class=3D"">
</font>
</div>
<div class=3D""> <br class=3D"">
</div>
<div class=3D""> <br class=3D"">
</div>
<div style=3D"font-family: arial, helvetica; font-size: 10pt;" =
class=3D"">-----Original Message-----<br class=3D"">
From: Scott Janzen <<a href=3D"mailto:sjanzen@me.com"; target=3D"_blank"=
class=3D"">sjanzen@me.com</a>><br class=3D"">
To: 'Friends of Triumph' Triumph <<a href=3D"mailto:fot@autox.team.net"=
target=3D"_blank" class=3D"">fot@autox.team.net</a>><br class=3D"">
Sent: Sun, Jul 19, 2015 6:54 pm<br class=3D"">
Subject: [Fot] GT6 differential failure follow-up<br class=3D"">
<br class=3D"">
<div class=3D"">
<div style=3D"word-wrap:break-word" class=3D"">
=20
<div class=3D"">
Pulled my differential out and apart today - did not find what I =
expected.
</div>
=20
<div class=3D"">
The input/pinion shaft is sheared off just forward of the pinion gear. =
</div>
=20
<div class=3D"">
The crown wheel has barely a mark on it, all teeth intact, no signs of =
damage.
</div>
=20
<div class=3D"">
The inner tapered bearing race on the pinion shaft is just mangled and =
there are roller bearings all over the place. However, the outer =
races for both pinion bearings look fine - no sign of discoloration or =
overheating, significant damage, etc.
</div>
=20
<div class=3D"">
It did fail when I was decelerating in second gear at high RPMs down the =
steep downhill on the new course in Pittsburgh, so the engine promptly =
slowed down - still, amazingly, there is minimal sign of rotational =
damage to the driveshaft - just a couple of paint scrapes. It was =
essentially unsecured at the rear, but perhaps the outer/forward pinion =
bearing kept it centered.
</div>
=20
<div class=3D"">
Both the shaft and the gear rubbed against each other so much there's no =
way to see any fracture marks.
</div>
=20
<div class=3D"">
One of the four bolts securing the spring to the top of the differential =
had cracked the housing, and it clearly leaked some oil there, but =
judging by the lack of oil on the underside of the car, I don't think =
this contributed to the failure. I had just topped it up before =
the weekend, and there was no sign of oil under the car throughout the =
weekend. Guess I'll be tapping the next diff for two more bolts, =
so there are six securing the spring next time.
</div>
=20
<div class=3D"">
<br class=3D"">
</div>
=20
<div class=3D"">
Photos attached.
<FullSizeRender.jpg>
</div>
=20
<div class=3D"">
<br class=3D"">
</div>
=20
<div class=3D"">
<FullSizeRender.jpg>
</div>
=20
<div class=3D"">
<br class=3D"">
</div>
=20
<div class=3D"">
<FullSizeRender.jpg>
</div>
</div>
</div>
<div style=3D"margin: 0px; font-family: Tahoma, Verdana, Arial, =
sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);" =
class=3D"">
<pre style=3D"font-size:9pt" class=3D""><tt =
class=3D"">_______________________________________________
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</tt></pre>
</div>
=20
</div>
</font></div></div></blockquote></div></div><blockquote type=3D"cite" =
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