Posted April 20, 201015 yr Hi All I ave a dt250mx (1980) and need to change the crank seals, now I have never done this before or stripped an engine this far. So my questions are: How do I do it, is it just a matter of taking it apart and carefully noting the procedure and then putting it back together. Do I have to split the cases or can the be done from the outside. Ad last do I need any special tools. Oh and if any one has a step by step guide.........(think that's asking to much). Thanks an hope I don't sound to much of a muppet!!
April 20, 201015 yr Moderator The magneto side will be the easiest. Why do you want to change them, have you found them to be faulty?
April 21, 201015 yr Moderator Hi Yes I have an air leak and it's pointing to the crank seals. Well i expect it to be similar to the 175. How much appetite have you got to do a full engine out and cases split. if you only plan on doing the seals alone I would attempt to do them with engine still intact and in the frame. Of course this does rather depend that your crank bearings are in good order this will save a lot of time. It's your call.
April 21, 201015 yr Author Well i expect it to be similar to the 175. How much appetite have you got to do a full engine out and cases split. if you only plan on doing the seals alone I would attempt to do them with engine still intact and in the frame. Of course this does rather depend that your crank bearings are in good order this will save a lot of time. It's your call. Hi Thanks for replying, don't have much of an appetite for an engine out job! just want to get riding as I have spent all winter getting it ready and thought when I stared it it would be straight down to the mot station. So just want to get the seals done the easiest way I can.
April 21, 201015 yr Moderator ok before we start what did you do to condemn the seals, how do you know they are faulty?
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