Jump to content

Unofficial Home of Old Simplicity & Allis-Chalmers Garden Tractors

Sign in to follow this  
Snojetter

KT17 damage

Recommended Posts

Snojetter

My brother in law had a conrod let loose on his 7117.  Damage to the cylinder is shown in the attached photo, outlined in red.  Everything else appears to be ok internally, so let's just assume this is the only issue.  The thought is to clean up the jagged edges of the break, hone the cylinder to eliminate any micro-edges on the inside of the cylinder at the break line, and then re-assemble.  Being the piston is still fully contained in the cylinder, it would seem this missing piece shouldn't cause any problems...but would like other's opinions.

Has anybody tried this?  Can you think of any problems this would cause?

Tractor1.JPG

Share this post


Link to post
Share on other sites
PGL

Never tried - it might work but the rest of the piston may be weakened and cause problems later.  If I had the $$ I'd replace while it's apart anyway and hopefully avoid another overhaul later.  Depends on whether the cylinder and crank etc. still worth the rebuild.  With that much of the piston skirt missing there is likely to be more slop as the piston moves up and down.

Share this post


Link to post
Share on other sites
puttputt

I had the same issue with a Kohler magnum. The broken area at the bottom didn't interfere where the piston rode in the cylinder. I showed it to a couple of mechanics and both said they would have no issues using it. Like you, I cleaned up the edges and had the cylinder honed. Put the engine back together and it runs like a charm. Can't say what will happen in the long run as I just did this recently. I did read other posts, I believe on this forum, where this question/issue was asked before and most said there should be no issue using the cylinder. But, it is up to you.

Share this post


Link to post
Share on other sites
720nut

Providing the piston does not travel that far down it should work ok but you need to determine bottom dead center on piston , you should be able to look in and see other piston to determine BDC

Some engines the piston protrudes out of bottom of cylinder when at bottom dead center.  Just my $.02

Edited by 720nut

Share this post


Link to post
Share on other sites
dhoadley
16 hours ago, 720nut said:

Providing the piston does not travel that far down it should work ok but you need to determine bottom dead center on piston , you should be able to look in and see other piston to determine BDC

Some engines the piston protrudes out of bottom of cylinder when at bottom dead center.  Just my $.02

Lloyd, I'm not sure I understand what issue/problem this would bring up if it did?

Share this post


Link to post
Share on other sites
bnolte

The KT17 series I had issues with oil starvation if it was operated on a slope. It was corrected with the Series II , but if you decide to rebuild a Series I engine, make sure you be careful about operating it on a slope..

Share this post


Link to post
Share on other sites
wwbragg

I agree that as long as the piston doesn't travel into the damaged area, it should be ok at the top end.  But one thing no one has mentioned is that it will probably blow oil from the crank case.  Even with a healthy coating of Permatex, there isn't much surface area to seal it in the bottom half.

I saw a pair of jugs on ebay for  $150 plus shipping ($50) and a couple of singles.  

Throw it back together and see what happens but I'd be prepared to ask Santa for some new cylinders.  Of course now we are talkin' about an upper half rebuild.

PS:  If you do get used cylinders, ask the seller to mic them for you so you know if you can even use them.  If I recall, there are 6 micrometer readings required: two at the top, two in the middle and two at the bottom.  Each pair of readings are at 90 degrees of each other.

Edited by wwbragg
PS

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

Sign in to follow this  

  • Who's Online (See full list)

    • allicatguy
    • Bear
    • Mach1martysr
    • MikeR9285
  • Today's Birthdays

    No users celebrating today
  • Recent Status Updates

    • Paul M.Murphy

      Paul M.Murphy

      Hello glad I got on this site. I hope to upload a couple of photos of my Simplicity Broadmoor 
      Model 707 Tractor. I have replaced all the belts on it and installed a new ignition switch.
      Have a mower deck which was in poor shape , repaced a couple of bushings and welded the
      deck where there was some holes. The tractor and mower deck came from a friend and the 
      mower deck metal was getting pretty thin. Some new metal was put in it and we also undercoated the underside of the deck. This was done by my friend Greg Toulman.
      I have not put the mower deck on the tractor yet, waiting for Greg to come home and give me a hand. Can you please tell me if there is a manual for the mower deck and where I could get one.
      I would also like to get some moon wheel discs as well.
      I will try and down load some photos of the tractor when my wife shows me how to. 
      I really love driving this tractor and also how well it is made compare today's tractors, especially the flexible rear end and the rollers.
      Tell the next time 
      Paul
       
      · 7 replies
    • jbrooks

      jbrooks  »  Talntedmrgreen

      Josh
       
      folowing  this from a link at the downloads.  I just rescued an AC 920 with the lambodini diesel. I can' t download  yet .  Where did you find the PDF copy you posted. . I would like to figure out how to adjust the injection pump. 
      I assume it's a bosche, correct
      · 0 replies
  • Adverts

×