Bearing Question
Bearing Question
I got my new tranny bearings yesterday,I know I can use the heat/freeze method for putting the new ones in but how do you guys get the old ones out without a puller?
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1994 Heartless CR500R
1986 KX500
- dannygraves
- Posts: 8020
- Joined: June 1st, 2007, 2:03 pm
- Location: Las Vegas, NV
heat the shit out of the cases and they pretty much just fall out ![Wink :wink:](./images/smilies/icon_wink.gif)
![Wink :wink:](./images/smilies/icon_wink.gif)
Last edited by dannygraves on September 26th, 2008, 9:49 am, edited 1 time in total.
'09 kx450f 4-Poke
Gen-4 trail bike --SOLD--
Gen-3 badass trail/mx bike --SOLD--
Gen-1 built dunes bike --SOLD--
'05 klx110 --SOLD--
'95 pw80
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Gen-4 trail bike --SOLD--
Gen-3 badass trail/mx bike --SOLD--
Gen-1 built dunes bike --SOLD--
'05 klx110 --SOLD--
'95 pw80
![Image](http://www.e-imagesite.com/Files/nitcirc117832991.gif)
If your a good welder, weld a bead around the edge of the bearing.
It will shrink the bearing, and it will just fall out.
NEVER REMOVE / INSTALL THE BEARING BY JUST BEATING ON THEM
The interference fit is crutical to long life. If the bearing spins, the motor is junk in a short amount of time.
Heating the cases, and "Dry Icing" the bearings works awesome to install.
It will shrink the bearing, and it will just fall out.
NEVER REMOVE / INSTALL THE BEARING BY JUST BEATING ON THEM
The interference fit is crutical to long life. If the bearing spins, the motor is junk in a short amount of time.
Heating the cases, and "Dry Icing" the bearings works awesome to install.
- dannygraves
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AlisoBob wrote:If your a good welder, weld a bead around the edge of the bearing.
It will shrink the bearing, and it will just fall out.
NEVER REMOVE / INSTALL THE BEARING BY JUST BEATING ON THEM
The interference fit is crutical to long life. If the bearing spins, the motor is junk in a short amount of time.
Heating the cases, and "Dry Icing" the bearings works awesome to install.
Does the bearing shrink ? Or does the heat transfer to the case and the case expand?
When I split my 86 cases a couple days ago the 2 smaller bearings on the tranny shafts just fell out so I guess those cases are junk eh?AlisoBob wrote:If your a good welder, weld a bead around the edge of the bearing.
It will shrink the bearing, and it will just fall out.
NEVER REMOVE / INSTALL THE BEARING BY JUST BEATING ON THEM
The interference fit is crutical to long life. If the bearing spins, the motor is junk in a short amount of time.
Heating the cases, and "Dry Icing" the bearings works awesome to install.
![Image](https://bannedcr500riders.com/images/auto/2c3f0077c4fda9bddf98648d641f9904.jpg)
1994 Heartless CR500R
1986 KX500
- dannygraves
- Posts: 8020
- Joined: June 1st, 2007, 2:03 pm
- Location: Las Vegas, NV
na, those 2 smaller ones aren't a press fit. this is a good thing since one doesn't have access from behind.
every pair of cases I have split has had those just fall out.
every pair of cases I have split has had those just fall out.
'09 kx450f 4-Poke
Gen-4 trail bike --SOLD--
Gen-3 badass trail/mx bike --SOLD--
Gen-1 built dunes bike --SOLD--
'05 klx110 --SOLD--
'95 pw80
![Image](http://www.e-imagesite.com/Files/nitcirc117832991.gif)
Gen-4 trail bike --SOLD--
Gen-3 badass trail/mx bike --SOLD--
Gen-1 built dunes bike --SOLD--
'05 klx110 --SOLD--
'95 pw80
![Image](http://www.e-imagesite.com/Files/nitcirc117832991.gif)
The ones on my 87 cases are not just falling out,mind you I havn't really tried to take them out yet,I just tugged a bit with my finger and they didn't move so I figured they were press fit alsodannygraves wrote:na, those 2 smaller ones aren't a press fit. this is a good thing since one doesn't have access from behind.
every pair of cases I have split has had those just fall out.
![Image](https://bannedcr500riders.com/images/auto/2c3f0077c4fda9bddf98648d641f9904.jpg)
1994 Heartless CR500R
1986 KX500
- britincali
- Posts: 8207
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[quote=""SOLID", Bro!"]
Does the bearing shrink ? Or does the heat transfer to the case and the case expand?[/quote]
The weld shrinks when it cools and pulls the bearing with it, only try this if you know how to weld![Wink :wink:](./images/smilies/icon_wink.gif)
AlisoBob wrote:If your a good welder, weld a bead around the edge of the bearing.
It will shrink the bearing, and it will just fall out.
NEVER REMOVE / INSTALL THE BEARING BY JUST BEATING ON THEM
The interference fit is crutical to long life. If the bearing spins, the motor is junk in a short amount of time.
Heating the cases, and "Dry Icing" the bearings works awesome to install.
Does the bearing shrink ? Or does the heat transfer to the case and the case expand?[/quote]
The weld shrinks when it cools and pulls the bearing with it, only try this if you know how to weld
![Wink :wink:](./images/smilies/icon_wink.gif)
Coolness list by 90cr500guy
Bob's = 50/50
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Brit = loser
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Bob's = 50/50
Cepek = cool
Solidbro = cool
Brit = loser
Stoffer = 1 up from Brit
MFDB = cool
Danny = ok
[quote=""SOLID", Bro!"]
Does the bearing shrink ? Or does the heat transfer to the case and the case expand?[/quote]
It shrinks as the weld cools. You can come back after a hour, and the bearing will still fall out.
AlisoBob wrote:If your a good welder, weld a bead around the edge of the bearing.
It will shrink the bearing, and it will just fall out.
Does the bearing shrink ? Or does the heat transfer to the case and the case expand?[/quote]
It shrinks as the weld cools. You can come back after a hour, and the bearing will still fall out.
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Re: Bearing Question
ALL the bearings in the bottom end are "supposed" to have interference fit, with the exception of 1 bearing in the right case, and 1 bearing in the left case...these 2 bearings have a tab that holds them in place but they too should have a near 0 tolerance fit. other than the 2 "tabbed" bearings, if ANY of the others just fell out you better fix that, other wise they will spin and fuk up the bore. actually if they just fell out that means they already have started to spin. to get those bearings out you need a blind bearing puller to get behind the bearing....rather than dropping huge cash on a qaulity bearing puller set i had my buddy at the dealer pull mine with his pullers (he charged me around $30 to remove all bearings including the 2 small clutch rod bearings which are a bitch to get in and out). $30 was pocket change since ill probly never have to replace any more bottom end bearings again in my life time. you could try the stove trick like others have mentioned, ive never done that to remove bearings so i cant comment on how well it workskkvslayer wrote:I got my new tranny bearings yesterday,I know I can use the heat/freeze method for putting the new ones in but how do you guys get the old ones out without a puller?
on a side note: i would be very cautios when heating the cases. a map gas torch can and will waaaay over heat the case if your not carefull
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i think bearing driver and press (with alittle heat) is the best way but not everyone has access to those tools, including myself. i used map gas/freezer to install all mine and it works fine but use common sense when using that hot of a torch. couple ways of keeping the bearings in there, provided the bore isnt wallered out....loctite has stuff like thread locker but its for bearings, i used a different method that worked good alsoNate wrote:I wouldn't heat with a torch. get it in the oven and keep checking it.
How can you fix the bearing from falling out? the welding trick?
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I've got a jetwash at the shop, its like a giant dishwasher. That sucker will heat the casses and clean the paint from them in one shot, if I'm lucky the bearings have fallen out before I take it from the wash. Same to put them back together, I do like running my crankbearings on the edge of beeing loose. Loose is fast!
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