Replacing left side Gearshaft Oil Seal

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Replacing left side Gearshaft Oil Seal

This is a discussion on Replacing left side Gearshaft Oil Seal within the CRF50 forums, part of the General Talk category; Do I have to remove the Gearshaft to replace the left side oil seal? I tried removing it from the outside but it appears to ...

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Thread: Replacing left side Gearshaft Oil Seal

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    Replacing left side Gearshaft Oil Seal

    Do I have to remove the Gearshaft to replace the left side oil seal? I tried removing it from the outside but it appears to be wedged in by something metal. Assuming that is either the gearshift arm or return spring.

    Thanks

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    Try using two long decking screws 180° apart on either side of the shiftshaft, threaded in three or four turns, and two pair of pliers to pull on the screws slowly and evenly. Use a flat washer and a deepwell socket to install the new one. A little dab of grease on the end of the shiftshaft will prevent tearing the inside edge of the new seal
    - dirtbkr188 -



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    Thanks for the super quick response. Unfortunately it rubber on this seal has deteriorated to the point that it is literally breaking a parting in small pieces. Guess I will be removing my first gearshaft.

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    Ok. Need a little more help please. Followed the instructions in my service manual and removed the clutch and primary driven gear as well as the stopper arm and return spring. Pulled down on the gearshift arm and tried to slide the gearshift spindle out, but in only slides a few inches freely.

    Here is a photo of how far I could slide it.



    Is there some trick to getting it out? Wanted to ask before I took my rubber mallet to it.

    Also check the oil seal in the second photo. Even thou the spindle is pushed back, there seem to be some type of metal ring in there as well a small spring around the spindle.

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    Replacing left side Gearshaft Oil Seal

    Fished out the mystery spring around the left side of the spindle. Not sure if that is supposed to be in there.
    Last edited by jamesfl; 04-11-2017 at 10:23 PM.

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    The spring is part of the old seal. It's supposed to be in there. The shaft may be bent a little. You could push it back in and try to bend it back closer to straight, then remove it. Or, just use the mallet. Not too much to be worried about with the mallet method.

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    Replacing left side Gearshaft Oil Seal

    Well I have good news and bad new. I realize the metal ring that was in the spindle hole was part of the old seal and I didn't need to worry about bending it. Had the old seal out and the new sealed installed in short order.

    The bad news, while reassembling the I snapped the head off the gearshift stopper arm pivot bolt.

    Hopefully I can out figure how I came remove it without damaging the case.



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    I hate it when that happens. Go get yourself a set of left hand drill bits. Your local auto parts, menards, hardware store, likely have them. And they're usually cheap enough. Then start with about a 1/8" bit,center punch the remaining stud and start drilling. If the 1/8" bit doesnt spin it out before you get about 1/4" deep, go up one or two sizes and start drilling again. It'll probably spin out easily. Be sure to cover EVERYTHING well to keep the shrapnel out of you engine.

    LH drill bits are the shix.

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    I got excited as I got it to move a little using a screw driver and hammer, but now it won't move any more. I will try to find some left handed drill bits tomorrow.


    Sent from my iPhone using Tapatalk Pro

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    The bolt that broke is a specialty bolt. It has a shoulder on it that fits into the detent arm so the arm can pivot when the bolt is tight. You'll have to buy the correct bolt before you'll be able to reassemble. If you tighten that bolt when the shoulder is not properly seated in the arm, it will break.

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    That's probably what happened then. I have the part number already and was planning to call the local dealer today as he already has other parts ordered for me.

    As for left hand drill bits, and particular brand that you recommend?

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    No, not really. I tend to smoke them so I buy them cheap. I also went and found 2 solid carbide LH bits, I think 3/16 and 1/4".

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    I measured the bolt thread and it is only 4.3mm which means I will need small bits and likely more broken bits. Probably should buy several.

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    Most likely it is going to come out of there easily. That is a 6mm bolt, almost certain. It has a skinny spot right under the shoulder, that's what you're seeing/measuring.

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    Replacing left side Gearshaft Oil Seal

    Thank-you kirrbby and my new $8 Harbor Freight left hand drill bits. Hope I never have use them again.

    kirrbby likes this.

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