O.S.140 RX

[Dave Smith]

Eric:   I think the problem with the hard to remove wristpin is solved.   After a bit of thought on the subject,I decided to check the pin for trueness.
It is not straight!
It is not out much,but there is a definite whoop-de-do in it. Even with one extra head shim,this engine seemed to pound on 20% fuel,(the only fuel used in it).  Otherwise it was a gem of an engine. 

Any suggestions on removing the carb??

Thanks,,,,,,,,,,,,,,,Dave
  ----- Original Message ----- 
  From: Henderson,Eric 
  To: discussion at nsrca.org 
  Sent: Sunday, February 02, 2003 10:41 PM
  Subject: RE: O.S.140 RX


  Dave,
            Are you saying that the piston and rod are still in the engine??

  Regards,

  Eric.


  -----Original Message-----
  From: Dave Smith [mailto:dfs at navnet.net]
  Sent: Saturday, February 01, 2003 6:10 PM
  To: discussion at nsrca.org
  Subject: Re: O.S.140 RX


  Mike:  Thanks for the clip info.  I finally got the clip off,by thinning the nose of a hemostat on one side. That enabled me to get behind it and get sufficient grip to remove it.
  That was just the start of the fun!
  The wrist pin can not be pushed out,it has to be pulled out,and it was in there mighty hard!
  To my way of thinking it would be great if the engine had an access hole in the front so one could just remove a plug,then push the pin out.
  I fashioned a hook from music wire,bent it back just a bit past 90 degrees,fitted it to size so it would be under tension when pulled. Eventually the pin came out,but I had to secure the wire in a vise,and apply heat from a heat gun.
  I am no engine expert,but I have been taking the things apart for 50 years,and I never ran into this problem before.

  Thanks very much for the info.

  Regards,,,,,,,,,Dave



    ----- Original Message ----- 
    From: mdarr00 at comcast.net 
    To: discussion at nsrca.org 
    Sent: Saturday, February 01, 2003 6:43 PM
    Subject: Re: O.S.140 RX


        Sorry Dave, my last e-mail stated that the tang should be about 3 1/6 long.  The correct size is 3/32 of an inch.

    Mike Darr
      ----- Original Message ----- 
      From: mdarr00 at comcast.net 
      To: discussion at nsrca.org 
      Sent: Saturday, February 01, 2003 5:37 PM
      Subject: Re: O.S.140 RX


          Dave, the tang on the clip should only be about 3 1/6 of an inch long, it does not go all the way across.  You need to use some very small needle nose pliers to remove the clip.  I can be tricky though, because the clip will just want to keep on spinning in the groove.  It really is not that bad though.  The inside of the wrist pin is not threaded.  Once the clips are removed you should just be able to use a pick or small scewdriver to push the pin through the other side.  Sometimes there will be some build-up on the piston, so the wrist pin may come out easier one way, as opposed to the other.


      Mike Darr
        ----- Original Message ----- 
        From: Dave Smith 
        To: discussion at nsrca.org 
        Sent: Saturday, February 01, 2003 10:06 AM
        Subject: O.S.140 RX


        HELP!     In disassembling the above engine,I have run into a problem in removing the clip holding the wristpin in place.

        The tang of the clip is so short,it seems nearly impossible to grip it in order to remove it. According to the diagram in the instructions,the tang should go almost all the way across to the other side of the clip. It is almost as though the tang was broken,[like used to happen on engines using this system years ago,such as the Kraft .61],but there is no evidence of this.

        Short of sending it to the service center,how do I remove this clip?

        Then once the clip is out,is the wristpin threaded internally so it can be pulled out?  If not,how?

        Thanks in advance,,,,,,,,,,,,,,,,,,,,,,,,Dave   NSRCA # 943
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