I?ve got one of those too. My Morgan came with what looks like a TR3 rear axle
and a new 4.88 set is in spares. Not sure what I?ll do with it!
Duncan
> On Sep 7, 2018, at 1:07 PM, Bob Kramer via Fot <fot at autox.team.net> 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
>
> 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
>
>
> 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
>
>
>> Looks like the pinion was way to deep.
>>
>>
>>
>>
>> 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
>>
>> >
>> >
>> >
>> > ----- Doorgestuurd bericht -----
>> > 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 -----
>> > 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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