Now that would be fun.
Sent from my iPhone
> On Sep 7, 2018, at 1:07 PM, Bob Kramer <rkramer56 at gmail.com> wrote:
>
> I have a 4.88 ring and pinion in a box. My Triumph club is running the VTR
> National near Austin next year and I've been volunteered to head up the
> autocross. I think I'll build a diff with it and put it in the Beandito, and
> sell tickets!
>
> Bob Kramer
>
>> On Fri, Sep 7, 2018 at 8:37 AM, barry rosenberg via Fot <fot at
>> autox.team.net> wrote:
>> Wasn't this the new set of gears? If so, they were new old stock from
>> England. They once belonged to Jim Ealy, who owned a black, 1966 TR4A race
>> car. I bought his junk yard to get his race car and the gears were new in
>> the box. I knew him since 1973 and he had the gears then. I had them until
>> recently. I would not think that back then there were cheap reproduction
>> gears available. He had 4:11, the 4:55 and 4:88 (great fun but useless). The
>> 4:11 went in the car when I sold it, the 4:88 were put in a locked diff and
>> played with on the street; the 4:55 sat on a shelf for all those years. If
>> the diff still had fluid in it, then it has to be improper set up,
>> unfortunately.
>>
>> Barry
>>
>>
>> From: Greg Blake via Fot <fot at autox.team.net>
>> To: Fot <fot at autox.team.net>
>> Cc: fot <fot at autox.team.net>
>> Sent: Friday, September 7, 2018 6:14 AM
>> Subject: Re: [Fot] Fwd: Crown and pinion gear break in
>>
>> Thanks guys for all the feedback.
>>
>> So far I have only put the car in the air and pulled the cover. There is
>> ample evidence of excessive heat so something went wrong with my setup.
>>
>> I might get the chance to pull it all out of the car and take some
>> measurements on Sunday. Once I do, I?ll share my original setup notes and
>> what I measure upon disassembly.
>>
>> On a related note. I ordered a new gear set from Rimmer on Monday and it
>> arrived in Austin today, standard shipping. Amazing. Way faster than some of
>> our domestic suppliers.
>>
>> This new gear set was supplied by Bastuck. Hopefully lasts a little longer.
>>
>> Sent from my iPhone
>>
>>> On Sep 6, 2018, at 7:41 AM, Rick Parent via Fot <fot at autox.team.net>
>>> wrote:
>>>
>>> Looks like the pinion was way to deep.
>>>
>>>
>>> On Thursday, September 6, 2018 6:38 AM, Bill via Fot <fot at
>>> autox.team.net> wrote:
>>>
>>>
>>> I doubt if a break-in procedure could have prevented failure, but as Marcel
>>> says, checking the temperature of the diff could have stopped the damage.
>>> The likely culprits are incorrect engagement or bad parts, but anything
>>> that heats the gears enough to cook the oil off the parts will kill the
>>> gears. I had a close call with one of the gear sets I use. Apparently I
>>> screwed up somewhere in checking fit?when I pulled the rear end to assess
>>> the problem there was no backlash. I have a huge finned differential cover
>>> so checking temperature doesn?t help, but I could feel the car slowing
>>> quickly between shifts. Fortunately I wasn?t doing my usual clutchless
>>> shifts and noticed the sudden deceleration every time I disengaged the
>>> clutch. The gear teeth were slightly blued and the oil smelled like a
>>> cesspool, but the gears were still usable once I did the setup properly.
>>>
>>> Bill
>>>
>>> > On Sep 5, 2018, at 1:48 AM, van.mulders.marcel--- via Fot <fot at
>>> > autox.team.net> wrote:
>>> >
>>> >
>>> >
>>> > ----- Doorgestuurd bericht -----
>>> > Van: "van mulders marcel" <van.mulders.marcel at telenet.be>
>>> > Aan: "Greg Blake" <gblake58tr3 at icloud.com>
>>> > Verzonden: Woensdag 5 september 2018 10:47:59
>>> > Onderwerp: Re: [Fot] Crown and pinion gear break in
>>> >
>>> > I think it is good measure to check the heat of the differential casing
>>> > after a few laps when the pinion and crownwheel are freshly mounted :
>>> > when the casing gets very hot, something is wrong : or the parts are bad
>>> > or they are mounted not correctly
>>> > There are at least 2 manufactures of the TR parts, I forgot about the
>>> > names. As far as I know, used original parts are running cooler than some
>>> > of the aftermarked parts. How was the noise of the diff? Did you notice
>>> > the smell during the first laps?
>>> > Marcel
>>> >
>>> > ----- Oorspronkelijk bericht -----
>>> > Van: "fot" <fot at autox.team.net>
>>> > Aan: "fot" <fot at autox.team.net>
>>> > Verzonden: Woensdag 5 september 2018 03:25:39
>>> > Onderwerp: [Fot] Crown and pinion gear break in
>>> >
>>> > 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.
>>> >
>>> >
>>> >
>>> > [image/jpeg:image1.jpeg]
>>> >
>>> >
>>> >
>>> > Sent from my iPhone
>>> > _______________________________________________
>>> > fot at autox.team.net
>>> >
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>>> >
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>>> >
>>> >
>>>
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>>
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>>
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