TRI-Z transmission question

[bigredridr]

just got my engine back from caverider. installed in the trike and had a question for you TRI-Z guys. cases assembled and looking at the drive axle, there is a steel collar that slides over the shaft in which the od of this collar seals against seal in the engine case. in all the tech pics ive seen the next piece to go on is the sprocket. but what seals the id of that collar??

maybe ive spent to many hours working on this trike and im overlooking something.

[MTS]

Nope, sprocket go's next. Once its all tightend down no leaks, dont forget the locking washer for the big nut.

[bigredridr]

thats how it came off but there was oil seepage all around that area. so thats normal?

[tecat-z]

I install a very narrow width o-ring between bearing and collar. This seals the inside. The bearing/collar have a small taper which creates a perfect seal when sprocket nut is tight. Often o-ring needs to be stretched considerably to achieve correct fit. I hope this makes sense... Oil needs to be maintained inside the cases, otherwise a leak will surely follow.

[bigredridr]

tecat-z thanks i did try with an o ring exactly like you have. i must need a thinner o ring because the sprocket washer will not sit properly on the teeth with my attempt.

[El Camexican]

The reason there is no seal for the I.D. of the bushing is because the bearing in the case that the output shaft rides on is sealed. If it was not it would leak in the area you are concerned about. As some have mentioned here there are engines that use a small o-ring behind that spacer bushing you are talking about, but as I said, on your model this is not necesary as the bearing is sealed. If you had seapage there before it could have come from only three places 1. The outer seal 2. The seal on that inner bearing is leaking 3. There was chain lube behind the sprocket that was seaping when hot ( very unlikley). Assuming you have changed the seal for that bushing take a look at the bushing and see if there is a grove in it. If so you can try turning it around so that a new, unscored portion of the bushing rided on the seal lip and creates a better seal than the worn part. And finaly, make sure you put grease on the lip of the seal before you insert the bushing, if you don't it will wear out prematurely and cut another grove into the bushing.

[El Camexican]

Almost forgot. That sprocket lock washer barely catches the teeth, so make sure you have it on properly before you tighten the nut.