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Unsticking a drain plug

Discussion in 'Fisher Engineering Discussion' started by Carpenter98, Feb 7, 2012.

  1. Carpenter98

    Carpenter98 Member
    Messages: 41

    I tried removing the drain plug to change the oil in my SEHP but the allen head stripped out. I tried heating it up with a torch and then backing it out with no luck. I want to try drilling it out but then I'll have to re-tap threads and put in a bigger plug. Before I go through this hassle do you guys have any other suggestions?
  2. Flipper

    Flipper PlowSite.com Addict
    from CT
    Messages: 1,180

    Its pipe thread. I would try drill through it and the use an extractor. If that doesn't work I have kept drilling them to the tap size and then used the tap to cut the rest out and have nice thread.

    I replace all of mine with square head brass plugs so make removal easier but I seldom take them out anymore.

    Are you changing fluid? I do mine by removing motor and disconnecting lift pins. Then I dump out fluid, remove pump and clean the whole resevoir out. Remount to framw and then fill resevoir with fluid before replacing motor. Don't forget to get old fluid out of hoses.
  3. ChrisFromBoston

    ChrisFromBoston Junior Member
    Messages: 11

    I've found welding a bolt to the plug works quickest and easiest for me.
  4. White Gardens

    White Gardens 2000 Club Member
    Messages: 2,665

    First, before I did any drilling, I would take a large easy-out and cut the tip of it off so you can take advantage of the recess for the Allen wrench.

    At that point, if it doesn't come loose, then I would start drilling and trying again. I personally would stay clear of drilling anything if possible, just so you don't contaminate your pump with metal shavings.

  5. sweetk30

    sweetk30 PlowSite.com Addict
    Messages: 1,588

    when you get it out and work done before reinstall put some copper anti seze on the threads so it will not freeze to the plug/aluminum body again.
  6. 06Sierra

    06Sierra PlowSite.com Addict
    from Maine
    Messages: 1,329

    Get some SeaFoam deep creep. Weld a bolt on and spray it as soon as you get the weld done. It should come out pretty good that way.
  7. deere615

    deere615 2000 Club Member
    Messages: 2,919

    Funny you post this as I am having the same problem on my atv front diff its a small allen key and wont come off. in the past I have welding a nut on and got them off that way the heat from the weld helps break it loose, I am going to do that to mine this weekend probably. Also I plan on replacing it with a hex head drain plug I would recommend you do the same
  8. NickT

    NickT Senior Member
    Messages: 707

    Haven't used my drain plug, just take the cap off and remove the bolt from the lift ram, then swing the pump down.
  9. Carpenter98

    Carpenter98 Member
    Messages: 41

    Thanks for the replies. I have not had the time (or the snow) to think about it. Maybe what I will do to save time and hassle is just drill & tap another hole and thread in a hex bolt for the new drain. My only worry about drilling is getting metal shavings in the tank but if I drill it and the oil runs out right away it should flush our any shavings.
  10. Flipper

    Flipper PlowSite.com Addict
    from CT
    Messages: 1,180

    As stated above the best and easiest way to fully change fluid is to remove motor (2 bolts) and dump it. Then while its out pull the pump (2 more bolts) and then you can drill and tap anything you want.