Crank Seal replacement

[theo547]

while i was pretty lucky to find out my crank is not bad... the seals are leaking and need to be replaced.

Now ive read through a few posts and in one im pretty sure Brent was saying you can just put a screw in the old seals and pull them through... the new ones should be just as easy to install.

But then i saw one where they were saying that wouldnt work and the case needs to be split.....


So how do i do this?!

[90GTVert]

You can do it without splitting the case. For a metal seal (some are metal some are rubber on the stator side) you can use a screw to remove it. For the rubber ones You can either pry them out gently (don't wanna damage the sealing surface of the case in any way) or poke through them and pull them out with a curved pick or hook of some sort. Clean the area around the seal. Push the new ones in straight as best you can by hand. Gently tap them the rest of the way in. Just be gentle with everything.

[jmkjr72]

and find your self some old pipe thats about the size of the seal and longer then the parts of the crank that sticks out that way you have a tool to help drive the seals in

[theo547]

Thanks man - i switched to premix today and i was running pretty lean with my 105 jet in... so this thing needs to get fixed because i refuse to go bigger

[theo547]

jmkjr - good idea.. i think i have some pvc thats about the right size, but ill figure that out when i get to it.

[90GTVert]

I usually use a wide sorta rounded edge brass punch I have and a hammer and work my way around. Again,I'll say... gently. lol

[theo547]

Gently. no 5lb mini sledge for this job huh?!

[jmkjr72]

yeah ill let you borrow my 1 ounce brass hammer

[90GTVert]

lol I use a 3lb for most jobs. Just tapped a seal in this morning with it.

[theo547]

1 ounce brass hammer?! did that come with a lincoln log set?! thanks - im pretty sure ive got atleast 2 of those little starter hammers lying around here somewhere. ill just use that

Now if you have a fly wheel puller i wouldnt mind borrowing that! either that or i need to grab my buddies bolt puller again.

[jmkjr72]

no i dont have a fly wheel puller for the hm i do have a stella/vespa p series puller
actauly i made it when i was working in a machine shop to help with real small adjustments on the tooling

if they have the shop open joel might have one

[aeroxbud]

A good Idea is to measure how far the old seals are sat in before you take them out. Then you wont put the new seals in to far.

[theo547]

thanks for the help guys - the seal on my stator side was totally messed up... took a screw driver to the metal edge and didnt even have to pry it fell out. tons of oil around it.

Thanks for the help

[bathtubfartbubble]

Grab yourself a roll of toilet paper.

Use the entire roll

Take the cardboard tube, and slip it in the slot where the seal goes..

That is the exact inner diameter where the crankseal slides into

One day, I splurged and bought 'CHARMIN', so I could have a stronger quality cardboard tube. I wrapped a couple layers of electrical tape on the end of the cardboard roll, and used it insert the seal by tapping the other end of the toilet paper cardboard roll. Gave little taps and looked how deep the seal was after so many taps.. You don't have to pound it too hard! Soft like Charmin

[FrankenMech]

I laughed when I saw your name bathtubfartbubble -it has been many years (65?) since I have used a bathtub but I remember those fart bubbles LOL

I also carefully examine the crank for worn spots and scratches. I also measure the old seal distance between the inside face and the seal lip to compare with the replacement seal. I try not to seat the new seal where the lip would ride on the same spot on the crank. I cut cardboard rings to use as spacer shims. I also use Permatex aviation form-a-gasket to retain loose seals.

This thread is almost 12 years old LOL but the info is still good.