[Fot] Fwd: Crown and pinion gear break in

Greg Blake gblake58tr3 at icloud.com
Fri Sep 7 13:38:34 MDT 2018 

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
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>> 
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