I guarantee you if you do not break in a new ring and pinion it will fail.
At Sebring 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.
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.
*Never be beaten by equipment.*
On Thu, Sep 6, 2018 at 9:00 AM, Bill Dentinger via Fot <fot at autox.team.net>
wrote:
> Amici...
>
> 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.
>
> Bill Dentinger
>
>
>
> -----Original Message-----
> From: John Styduhar via Fot <fot at autox.team.net>
> To: Greg Blake <gblake58tr3 at icloud.com>
> Cc: Triumph 'Friends of Triumph <fot at autox.team.net>
> Sent: Thu, Sep 6, 2018 8:07 am
> Subject: Re: [Fot] Crown and pinion gear break in
>
> 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.
>
>
> On Wed, Sep 5, 2018 at 12:53 AM Greg Blake via Fot <fot at autox.team.net>
> wrote:
>
> I would love to here the FOT experience in breaking in new differential
> gears. What has worked well for you in the past?
>
> 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.
>
> I am interested in the lists experience with brand new or new old stock
> ring and pinion break in.
>
> Here is a pic of the failed set.
>
>
>
> Sent from my iPhone_______________________________________________
> fot at autox.team.net
>
> http://www.fot-racing.com
>
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>
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>
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>
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