<div dir="ltr">I guarantee you if you do not break in a new ring and pinion it will fail. At <span class="" id=":kj.1" tabindex="-1" style="">Sebring</span> in 1966 I had four cars, all TR-4 cars IRS. Due to a problem with the limited slip devices the gears overheated, actually just the oil, the gears were okay. BUT, could not start a race I knew we would never finish. So, I sent back to Calif and had them send me three new diffs with the proper ratios. Installed started right off with hard practice no break in. No time for that.. By the 9th hour one diff had failed completely (spare installed car finished), one was making a racket but I thought would make it, the third limped around on the last lap at 15-20 mph to finish and the gears were totally wiped out. When taking the diffs apart in the shop the gears could offer a very close shave or even cut your throat. <div><br></div><div>Meantime in 1963 I ran three cars same type diffs same ratios but they had a 150 mile breakin in on Calif roads, then they were driven to the track from Miami. Never a whimper from them, all perfect, all cars finished and did the class, went went on to other racing after that.</div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature"><p><strong><font color="#000099">Never be beaten by equipment.</font></strong></p></div></div>
<br><div class="gmail_quote">On Thu, Sep 6, 2018 at 9:00 AM, Bill Dentinger via Fot <span dir="ltr"><<a href="mailto:fot@autox.team.net" target="_blank">fot@autox.team.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><font color="black" size="2" face="arial">
<div>Amici...</div>
<div><br>
</div>
<div>God knows I lack the horsepower to horn in on issues, and I know the parts were described as new, but to me the picture makes me wonder if that was a 'matched pair' to begin with.</div>
<div><br>
</div>
<div>Bill Dentinger</div>
<div><br>
</div>
<br>
<br>
<div style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original Message-----<br>
From: John Styduhar via Fot <<a href="mailto:fot@autox.team.net" target="_blank">fot@autox.team.net</a>><br>
To: Greg Blake <<a href="mailto:gblake58tr3@icloud.com" target="_blank">gblake58tr3@icloud.com</a>><br>
Cc: Triumph 'Friends of Triumph <<a href="mailto:fot@autox.team.net" target="_blank">fot@autox.team.net</a>><br>
Sent: Thu, Sep 6, 2018 8:07 am<br>
Subject: Re: [Fot] Crown and pinion gear break in<br>
<br>
<div id="m_-7237870189708816825AOLMsgPart_1.2_f5761b11-f17d-40e7-9368-3abdb3a25e18">
<div class="m_-7237870189708816825aolReplacedBody">
<div dir="ltr">
<div class="m_-7237870189708816825aolmail_gmail_default" style="font-size:small">Proper R/P breakin includes heat cycling the gears and allowing them to cool. Failure to heat cycle may lead to catastrophic failure. I would also jack up the rear end between sessions to see if the backlash is being maintained. </div>
<div class="m_-7237870189708816825aolmail_gmail_default" style="font-size:small"><br>
</div>
</div>
<br>
<div class="m_-7237870189708816825aolmail_gmail_quote">
<div dir="ltr">On Wed, Sep 5, 2018 at 12:53 AM Greg Blake via Fot <<a href="mailto:fot@autox.team.net" rel="noopener noreferrer" target="_blank">fot@autox.team.net</a>> wrote:<br>
</div>
<blockquote class="m_-7237870189708816825aolmail_gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I would love to here the FOT experience in breaking in new differential gears. What has worked well for you in the past? <br>
<br>
Last weekend, I was running the TR3 at Hallett with a brand new 4.55 gear set and it failed. I probably got 30 laps total in 4 sessions on track. I did not think to follow any set break in procedure with the gears and I am wondering if that is why they failed. <br>
<br>
I am interested in the lists experience with brand new or new old stock ring and pinion break in. <br>
<br>
Here is a pic of the failed set. <br>
<br>
<br>
<br>
Sent from my iPhone________________________<wbr>_______________________<br>
<a href="mailto:fot@autox.team.net" rel="noopener noreferrer" target="_blank">fot@autox.team.net</a><br>
<br>
<a href="http://www.fot-racing.com" rel="noopener noreferrer" target="_blank">http://www.fot-racing.com</a><br>
<br>
Donate: <a href="http://www.team.net/donate.html" rel="noopener noreferrer" target="_blank">http://www.team.net/donate.<wbr>html</a><br>
Archive: <a href="http://www.team.net/pipermail/fot" rel="noopener noreferrer" target="_blank">http://www.team.net/pipermail/<wbr>fot</a><br>
Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/fot/johnstydo@gmail.com" rel="noopener noreferrer" target="_blank">http://autox.team.net/mailman/<wbr>options/fot/johnstydo@gmail.<wbr>com</a><br>
<br>
<br>
</blockquote></div>
</div>
</div>
______________________________<wbr>_________________<br>
<a href="mailto:fot@autox.team.net" target="_blank">fot@autox.team.net</a><br>
<br>
<a href="http://www.fot-racing.com" target="_blank">http://www.fot-racing.com</a><br>
<br>
Donate: <a href="http://www.team.net/donate.html" target="_blank">http://www.team.net/donate.<wbr>html</a><br>
Archive: <a href="http://www.team.net/pipermail/fot" target="_blank">http://www.team.net/pipermail/<wbr>fot</a><br>
Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/fot/billdentin@aol.com" target="_blank">http://autox.team.net/mailman/<wbr>options/fot/billdentin@aol.com</a><br>
<br>
<br>
</div>
</font><br>______________________________<wbr>_________________<br>
<a href="mailto:fot@autox.team.net">fot@autox.team.net</a><br>
<br>
<a href="http://www.fot-racing.com" rel="noreferrer" target="_blank">http://www.fot-racing.com</a><br>
<br>
Donate: <a href="http://www.team.net/donate.html" rel="noreferrer" target="_blank">http://www.team.net/donate.<wbr>html</a><br>
Archive: <a href="http://www.team.net/pipermail/fot
Unsubscribe/Manage" rel="noreferrer" target="_blank">http://www.team.net/pipermail/<wbr>fot<br>
Unsubscribe/Manage</a>: <a href="http://autox.team.net/mailman/options/fot/kaskastner@gmail.com" rel="noreferrer" target="_blank">http://autox.team.net/mailman/<wbr>options/fot/kaskastner@gmail.<wbr>com</a><br>
<br>
<br>
<br></blockquote></div><br></div>