KX Riders

Maintenance & Technical => KX250 / KX125 => Topic started by: Jopiz on June 24, 2009, 10:34:28 AM

Title: Crank seal
Post by: Jopiz on June 24, 2009, 10:34:28 AM

Hey!

How this type of seal can be changed? Do i have to split the cases?  (http://img526.imageshack.us/img526/2362/p1050425.jpg) (http://img526.imageshack.us/i/p1050425.jpg/)



How does this look to you guys? I cant really feel any edges or something. Needs to be replaced possibly? Will it seal properly?
(http://img526.imageshack.us/img526/2696/p1050400t.jpg) (http://img526.imageshack.us/i/p1050400t.jpg/)

By the way is there any way to "flush" your low end to get all crap out of there (if there's some).

Title: Re: Crank seal
Post by: Jopiz on June 25, 2009, 09:50:20 AM

Anyone?  :roll:

Title: Re: Crank seal
Post by: razornpc on July 13, 2009, 10:02:02 PM

i cannt see any pics.

if its a kx250 i know youll have to split the cases though.

post again and let us know what your working on.

Title: Re: Crank seal
Post by: jinxy on July 15, 2009, 03:07:09 AM

as above you will have to split them
it is possible to do it with out splitting
but in most cases this will cause damage
to the caseing
j

Title: Re: Crank seal
Post by: kxracer on July 28, 2009, 03:47:18 AM

To split the cases you will need a specialist tool. They cost around $ 60 upwards. Rocky Mountaain make one as the link below.

However, you can make one quite easily with slotted UNISTRUT and M6 and M8 threaded rod and nuts. If you have non-slotted UNISTRUT, you will need to drill some holes top match.

UNISTRUT is very cheap or if you know someone, they may give you a short length. The whole tool cost me about $5.

If you message me, I will email a picture.

I will try and post a picture and instructions in due course.

 My crank popped out in no time. The flywheel side is threaded M6 and the clutch side has a hole in which an M8 bolt fits easily.

To push the cases from the crank:
1. screw in a M6 rod into two of the bolt holes in the crankcase and lock down with a washer and nut.
2. screw in an m6 (for flywheel side) threaded rod or slide in a m8 (for clutch side) threaded rod into the centre of the crank.
3. put a nut on each rod about 6 inches higher than the crankcase.
4. put the unistrut on the three rods and




http://www.rockymountainatv.com/productDetail.do?navType=type&webTypeId=140&navTitle=Tools%2FShop&webCatId=22&prodFamilyId=17167

Title: Re: Crank seal
Post by: KXcam22 on July 28, 2009, 09:33:08 AM

Is there any reason why that seal can't be removed from the outside, similar to a shiftshaft seal? Looks possible, what am I missing. Cam.

Title: Re: Crank seal
Post by: cbxracer30 on July 28, 2009, 01:47:26 PM

If that is a crank shaft seal it looks as if the last person put it in backwards or upside down depending on how you look at it. and there should be a lip on the inside of the case that would keep you from pulling it out from the outside.CBX

Title: Re: Crank seal
Post by: kaw rider on July 28, 2009, 02:33:29 PM

A seal puller should get that out.

Title: Re: Crank seal
Post by: BDI on July 28, 2009, 03:23:45 PM

What is thast thing an 85 :? If you can dig it out you have to be super carefule or you will scratch the machined surface that the seal presses into and the new seal won't seal in the case.

Title: Re: Crank seal
Post by: KXcam22 on July 28, 2009, 03:26:32 PM

No lip shown in the photo.  I am not familiar with that particular bike but most times I have put the seal in from the outside after the bearing is installed.  Cam.