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Thread: How to change your mechanical seal(water pump)

  1. #1
    Join Date
    Oct 2001
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    How to change your mechanical seal(water pump)

    I pretty much destroy the mech seal to get it out. I use a pair of needle nose pliers and rip out the springed seal so I just have the piece of metal in plain site. I then use a pair of metal cutters and begin to hack the metal piece out by twisting the metal so the seal sort of shrinks onto itself. Once the seal is out I pop out the oil seal and use a comparable size socket to pop the old
    bearing out.

    When I install the new bearing (I grease the bearing outer race and case) I use a comparable size socket and press the bearing in till its flush with the case.For the water pump shaft oil seal I use a over size socket and press the seal in till flush with the case. Before I press in the mechanical seal in place. I grease the outer part of the seal and the case area. I then line up the mech seal and
    press it in as much as I can with my thumb(not much). Once I know it is fairly level I put the pump shaft in.I use the old seal that was on the impeller and put the impeller on the shaft and hold the shaft with a flathead in the notch and tighten it down until it bottoms out. I then loosen it up and add some washers between the old seal and the impeller( to push the seal down further) i put the nut back on and tighten it down again until the outer metal part of the seal is flush with the case(make sure you do not tighten to much or you can break the black part of the seal and start all over again).Once that is done I install and grease the new seal for the impeller and press it in to the impeller and then I apply a liberal amount of grease to the mechanical seal and put it all together.
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  2. #2
    Join Date
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    Sounds like a good way to damage the impellar or shaft. The seal should be driven in using the outer flange as the Honda manual says. All you need is the right size socket or a piece of steel tubing that will catch the outer lip of the mechanical seal.
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  3. #3
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    nope, It works like a charm and have done it plenty of times. If someone is weary of trying it then go buy the tool, but its a waste of money.
    Atv Riders Photo Journalist and Atv riders atv specialist
    Ride:
    Laeger flip top protrax, Axis LT Shocks, Dominator +4 race axle , BWR 330 motor,Keihn 39mm pwk, 178 main, 52 pilot, DGH needle middle clip, Curtis Sparks TT Pipe& Silencer,CFM aluminum airbox, K&N Filter, 98 CR250 Boysen Rad Valve (rad 02b) W/spacer plate,Ricky Stator 200watt,Ricky Stator Rectifier, Ricky Stator Lightened Flywheel,Ricky Stator Billet Lights 200watt, Amsoil Dominator and C12 @ 50:1
    soon to have a B+B 320cc ktm rod stroker.

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  4. #4
    Join Date
    Feb 2003
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    Crestwood ky
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    I just take mine to a local honda shop. They charge me 5$ to put it in. Awhole lot easier. How ofter does your alls seals go out? I have replaced like 7 in two years. I don't have that many hours on the motor though. Also which way do you put the oil seal in? The garter spring face. I just want to make sure its in right. Also I put a new mechan. seal in then never rode it for like a month and a half and then I started it up, rode aroud for like 30mins and it started squeeling real bad and stalled the bike out. Could it be a bad bearing?
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  5. #5
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    Ive replaced a bunch of mechanical seals none of them have failed yet. Usually the pump starts leaking when the bearing wears out of spec. the oil seal faces towards the back of the mechanical seal to keep the oil in.

    if you have a problem withyour bike post it this is a thread to explain how to replace the seal.
    Atv Riders Photo Journalist and Atv riders atv specialist
    Ride:
    Laeger flip top protrax, Axis LT Shocks, Dominator +4 race axle , BWR 330 motor,Keihn 39mm pwk, 178 main, 52 pilot, DGH needle middle clip, Curtis Sparks TT Pipe& Silencer,CFM aluminum airbox, K&N Filter, 98 CR250 Boysen Rad Valve (rad 02b) W/spacer plate,Ricky Stator 200watt,Ricky Stator Rectifier, Ricky Stator Lightened Flywheel,Ricky Stator Billet Lights 200watt, Amsoil Dominator and C12 @ 50:1
    soon to have a B+B 320cc ktm rod stroker.

    ad me on facebook


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  6. #6
    Join Date
    Aug 2004
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    Long Island, New York
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    1,319
    I have coolent coming out of the bottom of the water pump on my R. Is a mechanical seal the same thing as the gasket? Any idea whats wrong?
    88 250R
    06 CRF250R

  7. #7
    Join Date
    Aug 2004
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    Long Island, New York
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    ANy one? i think nno one see's this because its to high up lol.
    88 250R
    06 CRF250R

  8. #8
    Join Date
    Oct 2001
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    N.J.
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    theres a pilot hole in the bottom of the waterpupmp, if its coming form there you need to replace your mech seal
    Atv Riders Photo Journalist and Atv riders atv specialist
    Ride:
    Laeger flip top protrax, Axis LT Shocks, Dominator +4 race axle , BWR 330 motor,Keihn 39mm pwk, 178 main, 52 pilot, DGH needle middle clip, Curtis Sparks TT Pipe& Silencer,CFM aluminum airbox, K&N Filter, 98 CR250 Boysen Rad Valve (rad 02b) W/spacer plate,Ricky Stator 200watt,Ricky Stator Rectifier, Ricky Stator Lightened Flywheel,Ricky Stator Billet Lights 200watt, Amsoil Dominator and C12 @ 50:1
    soon to have a B+B 320cc ktm rod stroker.

    ad me on facebook


    BWR part out all parts for sale!

    http://www.exriders.com/vbb/showthre...0&pagenumber=4

  9. #9
    Join Date
    Aug 2004
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    seal or gasket or what?? im confuesed not really sure which is which. It only leakes after i shut it off for like one second its a little drop.
    88 250R
    06 CRF250R

  10. #10
    Join Date
    Oct 2001
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    N.J.
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    look for a small hole on the bottom underneath the pump its called a weep hle, when the seal blows it leaks there..... use your EYES!
    Atv Riders Photo Journalist and Atv riders atv specialist
    Ride:
    Laeger flip top protrax, Axis LT Shocks, Dominator +4 race axle , BWR 330 motor,Keihn 39mm pwk, 178 main, 52 pilot, DGH needle middle clip, Curtis Sparks TT Pipe& Silencer,CFM aluminum airbox, K&N Filter, 98 CR250 Boysen Rad Valve (rad 02b) W/spacer plate,Ricky Stator 200watt,Ricky Stator Rectifier, Ricky Stator Lightened Flywheel,Ricky Stator Billet Lights 200watt, Amsoil Dominator and C12 @ 50:1
    soon to have a B+B 320cc ktm rod stroker.

    ad me on facebook


    BWR part out all parts for sale!

    http://www.exriders.com/vbb/showthre...0&pagenumber=4

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