Wheel bearings - spacing issue... idea's???

[squishio]

Hi All

Just fitting bearings into the front wheel on my gpz400r ('83)

I have fitted one side and now need to do the other (speedo drive side) however I have now discovered an issue with the spacer thing in the middle.

The sequence should go...

Spacer > Bearing > Speedo driver > circlip



https://www.rdphoto.co.uk/pictures/labled.JPG




the problem is with the spacer and the bearing, see below photo....

https://www.rdphoto.co.uk/pictures/IMG_1690.JPG


You can't really see it but the spacer is higher than the bearing seat so if you were to drive the bearing down the spacer would hit the inner race of the bearing before it is fully seated.

The old bearings only just came out and there wasn't anything else in there so washers etc are out of the question. From our measurements with the bearing sitting on the spacer everything would fit (speedo driver+circlip) but we don't want to drive it down and break the bearing by putting presure on the inner race only.


Any idea's what has gone wrong?

the other side is also driven correctly as the circlip to hold it in is perfect.


Quick response much appreciated!!!

Cheers!
Rich

paint may demonstrate the problem better.....



https://www.rdphoto.co.uk/pictures/paint.png
____________________
Current - Hornet 600, Transalp 650, X140 Pit, GPZ400R
Past - SY125, GT250, GT650, CX400, CBF600, Bandit 600, SL1000, GT250

[Timmeh]

Now I'm no expert but shoudn't the ID of the bearing be bigger than the spacer's?
____________________
GSXR400 x2 | '94 RVF400 | '93 TZR125 4DL (again)
20:22:30 BLUEX5: i would love to be forced to undergo a**l plugging with different sizes
20:48:18 Temeluchus: comp you hunk of smouldering homos3x you

[G]

[BanditsHigh]

It's normal for one bearing to be inserted flush with the bearing seat of the wheel, with the second one resting on the end of the spacer slightly above the bearing seat.

The manual should state which bearing should be inserted (flush to the surface) first.

This is done so that the inner race of the bearing is always guaranteed to be in contact with the spacer, thereby ensuring the inner races/spacer/forks are clamped together tightly ... if the bearing seats were flush and the spacer slightly too short then undue pressure would be put on the outer races.

All the best ... Barry

[Kickstart]

Hi

That doesn't look right. The spacer looks a bit too wide for it to be meant to be like that. Drive the bearing home and it would put a massive side load on the bearing.

However on some Kawasakis (eg, ZZR600) there is no ridge on one side for the bearing to rest on, so it is possible to put the bearing in too far.

All the best

Keith
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[squishio]

pretty certain the spacer is original.

There is definately a seat for the bearing to sit on.

When the bearings came out there wasn't a noticable gap, but I can't say for sure.


I have 2 bearings, so do have one spare, so I may smack it in and see what happens, but the distance between the bearing seat and the the top of the spacer is approx 3mm so is quite considerable

what function does the spacer have? (could I lose it?)
____________________
Current - Hornet 600, Transalp 650, X140 Pit, GPZ400R
Past - SY125, GT250, GT650, CX400, CBF600, Bandit 600, SL1000, GT250

[Kickstart]

[G]

Without the spacer, when you do up the spindle or similar, it will try and push the inner race of each bearing towards the centre of the wheel, generally knackering the bearings. So definitely not something you can do without!

[squishio]

Aha, i see it's function now

in which case can someone think of a magical solution for me
____________________
Current - Hornet 600, Transalp 650, X140 Pit, GPZ400R
Past - SY125, GT250, GT650, CX400, CBF600, Bandit 600, SL1000, GT250

[iooi]

[squishio]

bearings are the same as what came out...

I hit the other side down with a big socket hitting the outer race only so the inner race hasn't moved or been touched at all
Still moves smoothly so I dont think I have knocked it or anything accidentally.
____________________
Current - Hornet 600, Transalp 650, X140 Pit, GPZ400R
Past - SY125, GT250, GT650, CX400, CBF600, Bandit 600, SL1000, GT250