fot
[Top] [All Lists]

[Fot] Crown and pinion gear break in

Subject: [Fot] Crown and pinion gear break in
From: duncan.charlton54 at gmail.com (Duncan Charlton)
Date: Fri, 7 Sep 2018 20:36:16 -0500
References: <7FAC951C-9CE7-49E5-8DCA-37BDD2E7B8E6@icloud.com> <1425223651.1077147502.1536137279966.JavaMail.zimbra@telenet.be> <1518278895.1077153139.1536137336417.JavaMail.zimbra@telenet.be> <C32F1C79-7520-43DA-8280-01E2EAB5C50A@ponostyle.com> <2031959496.408884.1536237686897@mail.yahoo.com> <AE6D512D-2CF2-42AB-BA52-9B1F9F5065C3@icloud.com> <520565677.1085482.1536327452002@mail.yahoo.com> <CABFvdWsbXWYtGnNyspFni8QcX78LjRtr+iKcLy1Ypv7f0QaYkQ@mail.gmail.com>
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
>> > _______________________________________________
>> > 
>> > http://www.fot-racing.com <http://www.fot-racing.com/>
>> > 
>> > Donate: http://www.team.net/donate.html <http://www.team.net/donate.html>
>> > Archive: http://www.team.net/pipermail/fot 
>> > <http://www.team.net/pipermail/fot>
>> > Unsubscribe/Manage: 
>> > http://autox.team.net/mailman/options/fot/van.mulders.marcel at telenet.be 
>> > <http://autox.team.net/mailman/options/fot/van.mulders.marcel at 
>> > telenet.be>
>> > _______________________________________________
>> > 
>> > http://www.fot-racing.com <http://www.fot-racing.com/>
>> > 
>> > Donate: http://www.team.net/donate.html <http://www.team.net/donate.html>
>> > Archive: http://www.team.net/pipermail/fot 
>> > <http://www.team.net/pipermail/fot>
>> > Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/bill at 
>> > ponostyle.com <http://autox.team.net/mailman/options/fot/bill at 
>> > ponostyle.com>
>> 
>> > 
>> > 
>> 
>> _______________________________________________
>> 
>> http://www.fot-racing.com <http://www.fot-racing.com/>
>> 
>> Donate: http://www.team.net/donate.html <http://www.team.net/donate.html>
>> Archive: http://www.team.net/pipermail/fot 
>> <http://www.team.net/pipermail/fot>
>> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/rick.parent at 
>> att.net <http://autox.team.net/mailman/options/fot/rick.parent at att.net>
>> 
>> 
>> 
>> 
>> _______________________________________________
>> 
>> http://www.fot-racing.com <http://www.fot-racing.com/>
>> 
>> Donate: http://www.team.net/donate.html <http://www.team.net/donate.html>
>> Archive: http://www.team.net/pipermail/fot 
>> <http://www.team.net/pipermail/fot>
>> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/gblake58tr3 at 
>> icloud.com <http://autox.team.net/mailman/options/fot/gblake58tr3 at 
>> icloud.com>
>> 
>> 
> 
> _______________________________________________
> 
> http://www.fot-racing.com <http://www.fot-racing.com/>
> 
> Donate: http://www.team.net/donate.html <http://www.team.net/donate.html>
> Archive: http://www.team.net/pipermail/fot <http://www.team.net/pipermail/fot>
> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/britcars at 
> bellsouth.net <http://autox.team.net/mailman/options/fot/britcars at 
> bellsouth.net>
> 
> 
> 
> 
> 
> _______________________________________________
> 
> http://www.fot-racing.com <http://www.fot-racing.com/>
> 
> Donate: http://www.team.net/donate.html <http://www.team.net/donate.html>
> Archive: http://www.team.net/pipermail/fot
> Unsubscribe/Manage <http://www.team.net/pipermail/fotUnsubscribe/Manage>: 
> http://autox.team.net/mailman/options/fot/rkramer56 at gmail.com 
> <http://autox.team.net/mailman/options/fot/rkramer56 at gmail.com>
> 
> 
> 
> 
> _______________________________________________
> fot at autox.team.net
> 
> http://www.fot-racing.com
> 
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/pipermail/fot
> Unsubscribe/Manage: 
> http://autox.team.net/mailman/options/fot/duncan.charlton54 at gmail.com
> 
> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: 
<http://autox.team.net/pipermail/fot/attachments/20180907/d5f46ab6/attachment.html>

<Prev in Thread] Current Thread [Next in Thread>