Exam time!!
- Thread starter Swesty
- Start date
r100gser
Registered user
bearing
Hi the bearing numbers you mention are for normal ball bearings, your bike, according to the parts list has tapper roller bearings the info you want is included below
try this link
steering stem
http://shop.marksman-ind.com/32028-28x52x16-1692-p.asp
the bearing number is 320 28 and is diamentions are 28 x 52 x 16
front wheel
http://shop.marksman-ind.com/6005-2rs-sealed-ball-bearing-25x47x12mm-1377-p.asp
bearing size is 25x47x12 - 2RS means 2 rubber seals
however it could also be this bearing
http://simplybearings.co.uk/shop/p1...eel+Back+Seal+17x40x14.28mm/product_info.html
use this link to a micofilche to get any info you need about parts for your bike
http://realoem.com/bmw/partgrp.do?model=0483&mospid=51688
good luck with your Jobs....ian
Hi the bearing numbers you mention are for normal ball bearings, your bike, according to the parts list has tapper roller bearings the info you want is included below
try this link
steering stem
http://shop.marksman-ind.com/32028-28x52x16-1692-p.asp
the bearing number is 320 28 and is diamentions are 28 x 52 x 16
front wheel
http://shop.marksman-ind.com/6005-2rs-sealed-ball-bearing-25x47x12mm-1377-p.asp
bearing size is 25x47x12 - 2RS means 2 rubber seals
however it could also be this bearing
http://simplybearings.co.uk/shop/p1...eel+Back+Seal+17x40x14.28mm/product_info.html
use this link to a micofilche to get any info you need about parts for your bike
http://realoem.com/bmw/partgrp.do?model=0483&mospid=51688
good luck with your Jobs....ian
Beemerboff
Registered user
There is more to it than that - the steering head bearings need to be a special quality to cope with the impact loads, and if your wheel bearings are taper roller type, and my 86 G/S are, you will need to have the equipment and know how to reshim them.
The hubs should be heated to remove and replace the bearings , but only IF YOU WANT TO AVOID PERMANENTLY DAMAGING THE HUB.
The steering head bearings can sometimes be a pig to remove too - seems to vary from bike to bike - my G/S needed either an extractor or welding gear- there was no lip to knock them out.
Cycleworks in the USA sells a shim kit for the taper roller wheel bearings and an extractor for the steering head bearings , and perhaps even the correct grade of bearings too.
The hubs should be heated to remove and replace the bearings , but only IF YOU WANT TO AVOID PERMANENTLY DAMAGING THE HUB.
The steering head bearings can sometimes be a pig to remove too - seems to vary from bike to bike - my G/S needed either an extractor or welding gear- there was no lip to knock them out.
Cycleworks in the USA sells a shim kit for the taper roller wheel bearings and an extractor for the steering head bearings , and perhaps even the correct grade of bearings too.
r100gser
Registered user
bearing
I agree with the comments about the bearing having to be installed correctley, be carefull to heat the hub evenly and it would help to chiil the bearing as well, google bmw spesial tool 36.3.650, the key to correct bearing installation is to get the preload correct.
the same commonsense approach applies to the head races, in short if you have the correct tools - use the internet or clymer manual for refference- and take your time - it is comparatively straight forward.
however, I can not find any specifacation for highload capabilty bearings in the bikes specs. like all things you get what you pay for but all reputable bearing manufactureres e.g FAG, SKF etc are made to a common manufacturing specifacation and should be ok if you stick to the bearing number that is on the bearing that is fitted (ignore BMW part numbers) if it has rubber seal then fit a bearing with rubber seals - unless you feel metal seals are more suitable and do not use C3 clearence bearings unless they are called for in the bike specs.
I agree with the comments about the bearing having to be installed correctley, be carefull to heat the hub evenly and it would help to chiil the bearing as well, google bmw spesial tool 36.3.650, the key to correct bearing installation is to get the preload correct.
the same commonsense approach applies to the head races, in short if you have the correct tools - use the internet or clymer manual for refference- and take your time - it is comparatively straight forward.
however, I can not find any specifacation for highload capabilty bearings in the bikes specs. like all things you get what you pay for but all reputable bearing manufactureres e.g FAG, SKF etc are made to a common manufacturing specifacation and should be ok if you stick to the bearing number that is on the bearing that is fitted (ignore BMW part numbers) if it has rubber seal then fit a bearing with rubber seals - unless you feel metal seals are more suitable and do not use C3 clearence bearings unless they are called for in the bike specs.
Beemerboff
Registered user
The FAQs on F650.com have a good write up on the correct grade of steering head bearings - they use the same one as airheads.
The OEM bearing BMW fitted to the early F650 GS was a piece of Rumanian crap, one wheelie would kill them as it was the wrong grade, and the BMW boxed spares even worse, so there was a need for some decent information.
I thinks sanity has prevailed and BMW have returned to using branded bearings of the correct grade, but I wouldnt take the chance if I had to buy spares.
The OEM bearing BMW fitted to the early F650 GS was a piece of Rumanian crap, one wheelie would kill them as it was the wrong grade, and the BMW boxed spares even worse, so there was a need for some decent information.
I thinks sanity has prevailed and BMW have returned to using branded bearings of the correct grade, but I wouldnt take the chance if I had to buy spares.
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