Webra 160 help

[Keith Black]

I agree totally with Dave's statement, if you don't use method 1 below you will damage the conrod!

BTW, I have had a couple of engines that required "some force" to remove the wrist pin, and others that required more force than I could provide. This lead me creating a simple tool to pry the wrist pin out. Get a long 4 mm screw and a butterfly nut and thread it through a hard flat steel rod.  Screw the end of the 4 mm screw into the wrist pin and then turn the butterfly nut down against the steel rod that is against the exhaust port.  To protect the side of the piston I also put popsicle sticks between the piston and the inside wall of the crank case. 

This is sort of a reverse gear puller. See picture at link below:

http://www.fototime.com/865BF0EA2103D32/orig.jpg

Keith Black

----- Original Message ----- 
  From: DaveL322 at comcast.net 
  To: discussion at nsrca.org 
  Sent: Wednesday, June 01, 2005 9:36 AM
  Subject: Re: Webra 160 help


  1st method is the way to go.

  If the second method works - it is only because there is enough play in the conrod that the conrod (and/or possibly the wrist pin, or piston) need to be replaced.  The conrod will most certainly need to be replaced if the "pry" method is used.

  Dave

    -------------- Original message -------------- 

    One way, the way I have done it.

    Pull the head and the sleeve, the sleeve should slide out; if not I put a wood dowel in the exhaust port and nudge it up using a prop installed then you can grip it and move it out. The sleeve is aluminum so use care.

    Go in through the exhaust port with a narrow plier or hemostat and remove the circlip holding the wrist pin in the piston, you can do this in a baggy if you dont have a spare circlip cause the clip might get away from you. Then use one of the head bolts and thread it into the wrist pin through the exhaust port and pull the pin, this might take some force depending on how much then engines been ran. If you can clean any crude out thats in the pin area that might help. The piston will come off, the rod will fall off the crank and come out the cylinder.

    An alternate way that I have heard about is to remove the sleeve and position the rod so you can pry it off the crank leaving the piston and rod together.  

    Brian

    Wes Stafford <2flyrc at 3states.net> wrote:
      Hello All,
      I need help on changing the rear bearing on a Webra 160. How do you 
      remove the rod from the crank?
      Thanks,
      Wes

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