Triumph Spitfire - Differential Rebuild Take 2 | Roundtail Restoration

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Taking another shot at the differential. Gear mesh pattern is better, but still not to my satisfaction (or understanding). Can you help?
Want to see all of the body restoration of my 1966 Triumph Spitfire? This playlist starts shortly after engine rebuild and goes through completion: • Triumph Spitfire Resto...
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00:00 Intro
01:02 Determining Pinion Height
06:42 Adjusting Pinion Bearing Pre-Load
11:55 Measuring Differential Float
15:59 Shimming for Differential Pre-Load
17:55 Measuring Differential Backlash
19:36 Measuring Gear Mesh

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24 июл 2024

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Комментарии : 29

@timpsensky5181 5 месяцев назад

Increase the backlash to try to get in the middle or upper of the range, should give you a better pattern. I think taking a small amount of shim out of the pinion might also help.

@roundtailrestoration 5 месяцев назад

Thanks, Tim. Adjusting the backlash is a lot easier than the pinion, so I'll try that first and see what it does to the pattern. And when you say take some shim out of the pinion, just so I'm sure (since I messed it up once already), that will cause the pinion to move further away from the ring gear (lower into the diff housing), right?

@charlesbaker4508 5 месяцев назад

Interesting video certainly, and I wish I could contribute to solving your issue. I am planning on changing the ratio in my TR6 differential and in some of the reading I have done so far people have mentioned differences in pinion bearing thicknesses (as mentioned in a previous comment) to be aware of. Also, Steve Denton did a video of a Spitfire Diff rebuild with one of the well known service providers in the UK (can’t remember their name now, sorry) which you can search for here on YT that might be helpful. Good luck and thanks for putting these videos together!

@roundtailrestoration 5 месяцев назад

Thanks, Charles. Good luck with your TR6 diff. I did watch Steve's video and, while good, it didn't get into the nitty-gritty of some of the measurements and all where I thought my problem is. It's helpful, but not in my specific case. I also watched a few of Elin's videos, which are also good, but he nails the mesh pattern pretty much right off and I think my process, while not identical, accomplishes his actions equivalently. Still an interesting problem...hasn't beaten me yet!

@charlesbaker4508 5 месяцев назад

Very good! I’m sure you will figure it out soon. Hopefully there’s a video with the resolution…? @@roundtailrestoration

@typhoon1j 5 месяцев назад

Hi Chris- Another thing I notice is that @10:00 you are measure something and trying to overcome "Static Friction" which will be higher than the friction you will have when you start to rotate. In the end, you may be over compensating because you are measuring higher friction. - Phil

@RobertEHunt-dv9sq 5 месяцев назад

I agree and with what looks like …. No lubrication. Based on mechanics you could say the dynamic friction would be about 95 % of the static friction.

@roundtailrestoration 5 месяцев назад

That's a good point. I do have minimal lubrication (oil and some grease) all over everything. The workshop manual doesn't mention using an assembly lubrication and all of the videos I've watched don't show anything concerning that (across all sorts of different cars). You raise a good point, though. I'll give it a shot of fresh oil/grease and see if that changes anything.

@roundtailrestoration 5 месяцев назад

Yup, I agree. Running torque, also called prevailing torque is actually what I'm measuring here. It's the torque required to overcome that static friction. I think that's the point of this measurement is to determine that because the determines the preload you have on the whole thing. But, again, lubrication will definitely affect this (why ARP wants you to use their grease to torque their head studs) so I'll put fresh lubrication in there and do the measurements again.

@paulmcnair8106 5 месяцев назад

Oh! and differentials are hard!

@roundtailrestoration 5 месяцев назад

Still are, yes!

@paulmcnair8106 5 месяцев назад

Henry the V.... God bless.

@roundtailrestoration 5 месяцев назад

Thank you!

@ercost60 5 месяцев назад

Looks cold there! Do low temps affect clearances & assembly?

@roundtailrestoration 5 месяцев назад

That's a good question. It's about 35-40F down there, so that's what the metal temps are. Only thing I can say to that is I think that's within the expected temperature range where the car could be driven so I'd assume the tolerances account for that.

@redfoxclassics 5 месяцев назад

Afraid I’ve done pretty much everything on Heralds and Spitfires now except for a diff! The question I’d ask though is do you know (and how would one know) if your gear teeth are worn? If you have built everything to spec, that seems logically to be the remaining possibility for an imperfect mesh.

@roundtailrestoration 5 месяцев назад

Yup, I agree and that kind of goes to Nick's question below. I think if the gears are uniformly worn, then by me rebuilding it, it would "reset" everything and I'd be able to account for the wear with all of the shims. But, if the wear is not uniform, or something is bent or whatever, I don't think you could adjust that out and I'd have a problem (and need a new set of gears...again). Thanks!

@typhoon1j 5 месяцев назад

Hello Chris- I really like you vid's, you have gotten me through my 1970 SPIT build! @5:30 you show you height gauge placed on a curved surface. If I am seeing that right, you are really measuring from a cord of a circle and not the base of the circle. It is hard to tell from the video but that would be a problem. The dimensions you are talking about, you are adding to the error. - Phil

@roundtailrestoration 5 месяцев назад

Hi, Phil. My stupid arm is in the way. The depth gauge is running across the two carrier bearing supports. Hard to explain without giving you a picture, but that is a flat surface. Glad you are enjoying the videos!

@omegaman344 5 месяцев назад

I’m not sure if this is salient, but I have seen the newer TR6 pinion bearings having a different dimension than the originals. I do not know if you changed it, measured and compared the bearings. It would seem from what I see, the pinion needs adjustment. Thanks for the video, it is very educational and satisfying when you figure it out.

@roundtailrestoration 5 месяцев назад

Thank you. I do need to check the old pinion and see what I get. The gear teeth are shot, but comparing measurements may provide insight. Thanks!

@mikeparsons1905 5 месяцев назад

Generally speaking, two differing patterns on the ring gear, would indicate a bad grind of the gears from manufacturer... but i didnt hear you say these were new pinion and ring gears..

@roundtailrestoration 5 месяцев назад

Thanks, Mike. The gears are new to me, but not new. My old set was pretty badly pitted. But, I might put them back in just to see what kind of pattern they give me. If it's better, then I think I have my culprit.

@mikeparsons1905 5 месяцев назад

I think I see the issue... you have a set of gears from one housing that probably wore in or was set up wrong. Try the old gears, but I think the old gears will show a better pattern.. if that is the case, it might be a good idea to buy a new set.

@roundtailrestoration 5 месяцев назад

@mikeparsons1905 well that would be disappointing. At least I'm getting pretty good at taking it down and putting it back together

@nickyalousakis3851 5 месяцев назад

you may want to paint four sections of the crown instead of one. it will tell you if your crown ring is kaput. it does sort of look it.

@roundtailrestoration 5 месяцев назад

Good idea. I'll do that. I hope it's not the gear itself. I bought it used to replace the ones that were in there that were severely pitted. I might just put them back in and do the whole thing again and see what I get. If I get a good pattern using the old stuff, I'd say my only difference is the new pinion/crown gears. That would be disappointing!