Final Drive overheating

[crazy steve]

Yeah, that shouldn't come out.... but I've got one wheel here where that spacer doesn't have the lip on it and will come out, so there are some out there...

One thing I've noticed about the parts fiche; it reflects service, i.e replacement parts, not necessarily what was originally installed. So I'm not so surprised when I find stuff that doesn't quite match what's shown. Just one example of that is the '78-79 mechanical advance unit; the fiche show the same number for both, but I've personally verified that they're two different parts.

You're in car repair biz, how many times have you got a new replacement part that's slightly different from what you took out? I know you've run into this....

[BA80]

You're in car repair bisiness, how many times have you got a new replacement part that's slightly different from what you took out? I know you've run into this....

Yeah +1 on that. Sometimes the aftermarket replacement doesn't even look like it will work.

I was ready to back you up on what you had posted but I couldn't recall ever having that spacer fall out so I went and looked.

The only thing that bothers me about it is that LR bearing is made of unobtainium so there doesn't seem to be a lot of different aftermarket replacements that could be different.

[crazy steve]

I'd take a pic of that wheel but it's up in the overhead covered with other 'stuff'...

But the fact remains that if all the spacers are in place, all of the axle torque should be transferred through those, with none on the bearings. These aren't like an front hub on a older car where you set your bearing pre-load with the spindle nut; it's designed to tighten that axle nut down tight to give rigididity to the swingarm.

This is a weird one for sure, and I think I'd be looking for another wheel at this point....

[BA80]

This is a weird one for sure, and I think I'd be looking for another wheel at this point....

That's what I'M sayin'. Even if just for a test.

[crazy steve]

...There's a clearance between the dust cover and the FD (can slide paper between them, all around, so no binding there)...

This quote is what bothers me; every wheel/FD I've assembled has had lots of room between the FD and cover. So if this is down to where he can just 'slide paper between' indicates to me that wheel is going into the FD too far...

[BA80]

What bothers me is that it was fine until it was taken off and reinstall was attempted. That is when the problem occured.

Something went fruit in between removal and reinstallation. No offense but it seems a lot like operator error.

Something is missing or installed wrong according to Hoyle.

[gargoyle_house]

I think you are correct

I'm going to take it apart again and see, but I don't have that little spacer sticking out of the seal -- it's a sleeve in the bearing that can slide in and out easily -- I only have the Clymer manual -- and it's diagram on pg 215 shows two things I don't have, so that's probably the real problem...

the first is #9, a 'flange spacer' that it shows is between the distance collar and the LHS bearing. My collar was all I found inside the wheel when I removed the bearings.

The second, and probably the most important, is #18, the 'collar' between the LHS bearing and the FD, which is under the oil seal (#19). I just removed the seal this morning to clean & check the bearings -- clearly wasn't there before since it seems (in the diagram) to have a shall ridge/shoulder that keeps it inside the seal.

I'll strip down the wheel/etc. and take closer pics this evening. Is there another diagram somewhere in this site that I can get a part number for that collar?

And thanks guys. I always blame the operator whenever something goes wrong -- oh, wait, that's me...

[BA80]

Try this

[steelraider]

2 Cents worth. Don't forget, This is a pinching arrangement compressing both sides of the axel and spacer items located on it. The problem doesn't necessarily have to be on the "nut" side. Check items on both ends of the axel. Steve is right that all torque should be on the spacers, not the bearings. The proof of the pudding will be when you torque the nut, you should be able to torque as much as you wish with no additional friction applied to the wheels ability to turn. 108 ft/lbs is the pressure the factory says is enough to keep averything tight. This is not a magic number and should have no real affect on bearing wear. To check proper spacer lengths is that after torquing you should be able to grab the wheel and check side play (move it left and right horizontally. If there is play then spacers are to long. If wheel doesn't spin well, then spacers are to short allowing bearings to be compressed.

[BA80]

If there is play then spacers are to long. If wheel doesn't spin well, then spacers are to short allowing bearings to be compressed.

agreed.........or missing.

[gargoyle_house]

Solved -- but now need part...

Yes, the collar is missing. I've found the part number (90387-20741-00 COLLAR) thanks to BA80 and have been searching parts sites for it...if any of you know a good place to find such an obsolete part -- let me know. So far, you guys have known answers to all my questions -- I really do appreciate it.

Ron Butzlaff
gargoyle_house

[Rasputin]

I may have one in my parts bin but I am not sure. I will look for you but do not stop looking elsewhere as I might not have it.

[gargoyle_house]

I found the part on

http://www.m-and-d.com

Ordered two -- will see if they actually have it in stock and ship it --

Rasputin, if you find you have it, PM me and I'll buy yours, too -- esp if you can Fed Ex it to me -- I suspect m-and-d.com will take two weeks to send theirs...and I want to ride -- so bad!

Thanks.

[crazy steve]

I'm going to take it apart again and see, but I don't have that little spacer sticking out of the seal -- it's a sleeve in the bearing that can slide in and out easily -- I only have the Clymer manual -- and it's diagram on pg 215 shows two things I don't have, so that's probably the real problem...

That 'sleeve' is the inner race for the LH wheelbearing. Yep, that spacer missing is the problem (oh ye of little faith...) and running it without that is what killed the FD. As to that 'flange spacer', you might be able to get away with not having that.

[BA80]

Yes, the collar is missing. I've found the part number (90387-20741-00 COLLAR) thanks to BA80 and have been searching parts sites for it...if any of you know a good place to find such an obsolete part -- let me know. So far, you guys have known answers to all my questions -- I really do appreciate it.

Ron Butzlaff
gargoyle_house

Figures it would be #13.