[Fot] Fwd: Crown and pinion gear break in

[barry rosenberg]

Did it run out of fluid? It looks like the gears got hot and melted. I have seen one do this at Road Atlanta after it lost fluid from a leaking seal and an ignorant owner who ignored all the little puddles in the paddock under the car after every session. The pinion gear melted and wore the shaft into a hourglass shape from the heat. The ring gear looked ok. I always use a 90 weight gear oil or heavier, up to 140 with a half can of STP. Never ran a break in period, just drove the car. Did you paint the gears after assembly and check the mess pattern? Did you use the Triumph set-up tools or guess at the clearances? Teethe usually break if they are not meshed correctly or the pinion pre-load is not enough and the gear gets a little wobble at speed. I use a few drops of ATF on the bearings when setting the pre-load and not heavy gear oil.
Barry

      From: van.mulders.marcel--- via Fot <fot at autox.team.net>
 To: fot <fot at autox.team.net> 
 Sent: Wednesday, September 5, 2018 12:06 PM
 Subject: [Fot] Fwd: Crown and pinion gear break in
   


----- 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]



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