5 replies [Last post]
312Icarus
312Icarus's picture
 Offline
Joined: 07/15/2016
Posts: 407

I have owned my ‘68R50 US for over 40 years and have never touched the wheel bearings. Granted, it has sat for most of the last 20 or so years in dry storeage, but since I have resurrected it, it seemed time. Reading Duane Asherman’s instructions, I was a bit daunted, but decided to tackle them.

I took the rear apart, and it is perfect. The bearings are clean, the grease is clean, they have not been leaking around the seals or anything. Rather than driving out the entire bearing assembly as Duane instructs, do you think I can simply clean up the hub cap side of the bearings, shoot some grease into the hub to get the back side, pack the hub cap side conventionally and simply put it back together with new felt seals?

I ride a couple thousand miles per year, at most, mostly 40-50 mph on country roads with some in town errands.

Opinions welcome.

Icarus

PS. Duane’s site posts a bearing longevity graph that shows that the bearing ought to last several BILLION miles so I am not too worried about failure.

T

malmac
malmac's picture
 Offline
VBMWMO #8751
Toowoomba, Australia
Joined: 06/29/2014
Posts: 299
I would guess

I would guess most wheel bearings, car, bike trailer etc - fail because they run dry or get water past the seals and rust up - I guess there are other possibilities - but really.

So if your bearing are not out of adjustment and have an adequate supply of the correct lubricant - why disturb them further.

Cheers - just my opinion.

Mal

__________________

mal - R69s
Toowoomba- Australia

312Icarus
312Icarus's picture
 Offline
Joined: 07/15/2016
Posts: 407
That’s sort of my feeling, if

That’s sort of my feeling, if it aint broke...don’t fix it. Since the grease is not dirty, or dry (or wet) I’m simply going to clean up as I can without disturbing the pack, shoot grease into the pack, put new felts on andbe done with it. After at least 40 years I am probably fine for my life time the way I ride.

Thanks.

Icarus

schrader7032
schrader7032's picture
 Offline
VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6734
The tapered roller bearings

The tapered roller bearings do very well with some slight preload on them. I think that is the point of Duane's chart. There are a couple of ways to get the preload. A guy known as Snowbum has an extensive discussion about bearing preload and suggests using a fish scale to measure the amount of resistance when the stack is properly torqued. It's pretty complicated. Duane's approach is the "shake the wheel" test. He specifies that as the axle is torqued, periodically grab the tire at opposite sides and see what kind of slop there is. That slop should disappear just as the final torque is applied. That way you have a small amount of preload but not too much.

If the slop disappears way to early, that means the bearing stack is being overly compressed. Duane used to sell small shims. The idea was that one of the shims placed in a specific spot in the stack would minimize the amount of compression. If the slop never disappears, then the wedding band spacer was too thick and had to be changed out for a thinner size or carefully sanded figure-8 style to remove a small amount, be sure to keep the surfaces of the spacer parallel to each other.

__________________

Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

wa1nca
wa1nca's picture
 Offline
VBMWMO #8374
Ashfield Ma.
Joined: 09/27/2012
Posts: 489
Shims

If you are using the original bearings their should be no need to shim the stack
I may be wrong but it is my understanding that shims may be changed because of a slight difference of the width of a new bearing

Tommy

__________________

Tommy Byrnes
54 R51/3 55 R50 64 R27 68 R69US 68 Sears Allstate 250 (Puch)

schrader7032
schrader7032's picture
 Offline
VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6734
I agree, Tommy, but it would

I agree, Tommy, but it would be best to at least go through the steps to see where the bearings are. I don't know how stable the hubs are where the external races seat, but could be over time with all those miles and torque on them, the dimensions could change slight. Trust but verify!!

__________________

Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.