Transaxle trouble Options

[Hank914]

Last two

I think this bearing is usable.

[Hank914]

Nah, save the money on shipping unless you really want me to mess with it. If the races give you a hard time, then send it to me and I will handle the whole shooting match. Pics of the diff and associated gears should suffice, though (IMG:style_emoticons/default/smile.gif)

Got the races out, but on the smaller one I could only get one of the clips out. Do you need both little spring clips?

I'm ready to box it up and ship it out tomorrow. Let me know if you want more pics.

I'll pm you regarding bushings etc.

[Dr Evil]

No need for any of the clips, just as long as the races come with the stack. I will make sure they are good to go as it would such to toss new bearings if not necessary.

When I was asking or guts, I meant the spider gears and shaft INSIDE of the diff (IMG:style_emoticons/default/wink.gif)

[Dave_Darling]

Are you going to re-use anything from that trans? I'd think that it would be far easier (and cheaper!) to just get a new/used trans to use as a core. With the trashed case and the trashed R&P...

--DD

[Hank914]

No need for any of the clips, just as long as the races come with the stack. I will make sure they are good to go as it would such to toss new bearings if not necessary.

When I was asking or guts, I meant the spider gears and shaft INSIDE of the diff (IMG:style_emoticons/default/wink.gif)

Oh....

[Hank914]

No need for any of the clips, just as long as the races come with the stack. I will make sure they are good to go as it would such to toss new bearings if not necessary.

When I was asking or guts, I meant the spider gears and shaft INSIDE of the diff (IMG:style_emoticons/default/wink.gif)

Oh....

Those all looked fine, spun them around and saw no damage.

Same with the splines.

[Dr Evil]

Interesting. Such damage done by one tooth from the pinion. I am also surprised that the wheels locked as I have seen race boxes with teeth shorn off (I call them hillbilly gears) when a malfunction allows selection of two gears at once, or there is a missed shift. But, the gears are supposed to be the weak link.

[6freak]

Well, I was not drunk at this clinic and I am not sure what you are insinuating that I missed at the one at your house, and I take accusations like that seriously. All I have with my biz is my reputation. So, what exactly are you referring to?

And, your assessment that the pinion depth was off is way wrong. Pinion is set finite for noise reasons. It will work just fine if out by an amount that is not ridiculous. If it were out, he would have heard loud whining during the long trial that he did. Your assumption seems to have missed some very key details that were provided.

I was not laying blame in anyway and never said you were drunk.
, sorry you took it that way.I don`t remember any that came from my house that where not 100% correct or never heard of any issues pop up ! there was one in Oregon something backwards gears,Hell I dont remember
.I`m just going on percentage`s fix 100 and 1 is bound to go south or break or leak or something! that`s all i was saying ..he was just the unlucky one

[Dr Evil]

Well, I have received and have have had time to go through the guts of the tranz. Interesting things found. Lets start with the main culprit that caused the casualty. The roller bearing in 1sy gear failed and welded the pinion shaft to the gear. Thus, the tranz was always in 1st. You can see where this would be a problem when you select 5th.

Above of the gear is what the roller bearing should look like.


The race of the int plate bearing was welded to the washer that goes between first and the bearing. You can see the discoloration on the washer from the heat.


So, why the hell did this bearing fail? Great question, and a great time for some teaching on a very fine point in rebuilding that I have only come across about 2 times.

The bearing and the inner race should be able to pass through the gear with very little friction (basically none if kept parallel to the gear face). I salvaged the dog teeth off of the old, welded 1st as they were in perfect shape. I installed them on the new 1st and then checked everything for fit. That is when I noticed that when the roller bearing and inner race were pushed through to the side of the gear with the dog teeth, it started to bind and eventually stuck. This was odd. I took the dog teeth off and everything pushed through without effort. So, the teeth likely shrank the ID of the gear by such a slight amount that every thing bound up and failed. I put a different set of teeth on the gear and tried everything again and noted that the roller and inner race moved through the gear with no issues.

So, likely scenario is that the dog teeth were manufactured to poor tolerance, closed the ID of the dog teeth side of the gear by a small amount when installed, caused the roller bearing to bind, which welded everything together, and caused the stack to seize.

The easy lesson; if stuff is sticking, look for a cause.

The only other casualties from this; 5th gear had one tooth with a mark on it so 5th was swapped, and the large pinon roller bearing had wear on the race.

Hopefully folks can learn from this. Always good to share things like this.

[veekry9]

Illuminating.

[rhodyguy]

do you know if one of the new bearing sets were installed? or is the failed bearing not one of the ones included in the set?

[Dr Evil]

The failed bearing was a needle bearing and not one of the new ones. However, one of the new roller bearing was damaged so has been replaced.

[veekry9]

I presume the negative clearance on the synchro ring has a limit.
Did the factory shrink them on?
Pressing them would for sure gall the surface.
SOP for 20Krev spindle tooling is that type.
Liquid nitrogen/Hot oil/induction.
Haven't researched the method used,if at all referenced.

[Dr Evil]

They are pressed on. No NASA shit here. Pretty simple. Also, the offending teeth set went on easy which is misleading.

[veekry9]

SOP in any m/c shop cool the male heat the female.
Since'68,a Bearing worth 30K is given no chance to fail on first run.
Turbine power generators and transmission.
Nothing to it.
Delta T.