Jump to content

Nominations for Tractor of the Month
Garden Tractors and Parts on eBay



Photo
- - - - -

No luck getting the 1250 running


  • Please log in to reply
137 replies to this topic

#76 accidentalchild OFFLINE  

accidentalchild
  • Senior Member
  • Member No: 68112
  • 365 Thanks
  • 444 posts
  • Location: United States

Posted March 07, 2016 - 11:12 PM

I started taking off some stuff and shot this video of the "insert technical jargon here" jobber. It seems like the more I crank this over the more pressure is built up making it more difficult to turn over. Is the exhaust valve not opening all the way or what. Obviously I am not real familiar with these old engines.

Attached Files



#77 accidentalchild OFFLINE  

accidentalchild
  • Senior Member
  • Member No: 68112
  • 365 Thanks
  • 444 posts
  • Location: United States

Posted March 07, 2016 - 11:22 PM

Some various pictures .

Attached Thumbnails

  • image.jpeg
  • image.jpeg
  • image.jpeg


#78 accidentalchild OFFLINE  

accidentalchild
  • Senior Member
  • Member No: 68112
  • 365 Thanks
  • 444 posts
  • Location: United States

Posted March 10, 2016 - 07:24 PM

Looks like I am gonna pick up another s-12-d tomorrow. I am thinking it may be useful for parts and such . 75 bucks sounds good.
  • LPBolens and AA Hayes have said thanks

#79 AA Hayes ONLINE  

AA Hayes
  • Senior Member
  • -GTt Supporter-
  • Member No: 67383
  • 324 Thanks
  • 274 posts
  • Location: Ontario Canada

Posted March 10, 2016 - 10:52 PM

Looks like I am gonna pick up another s-12-d tomorrow. I am thinking it may be useful for parts and such . 75 bucks sounds good.


I suggest compression test the new s12d before mounting to tractor if that is your route. If it needs anything do it while it is out of the tractor.
  • accidentalchild said thank you

#80 accidentalchild OFFLINE  

accidentalchild
  • Senior Member
  • Member No: 68112
  • 365 Thanks
  • 444 posts
  • Location: United States

Posted March 11, 2016 - 07:15 PM

I suggest compression test the new s12d before mounting to tractor if that is your route. If it needs anything do it while it is out of the tractor.

i passed on the motor as the cooling fins were so rusty they were breaking off in flakes. I am gonna order a head gasket and go from there.
  • TomLGT195 said thank you

#81 accidentalchild OFFLINE  

accidentalchild
  • Senior Member
  • Member No: 68112
  • 365 Thanks
  • 444 posts
  • Location: United States

Posted March 13, 2016 - 12:22 AM

So I took this beast apart and it looks like the head had a tunnel to leak right through the gasket. There are no cracks anywhere that I can find on the head itself or the block. This is my first time opening one of these up but it looks to me that it has a ton of carbon built up. I will order a head gasket and clean and adjust the points. Anything else I should be doing while I have this opened up?

Attached Thumbnails

  • image.jpeg
  • image.jpeg

  • blackjackjakexxix said thank you

#82 Eric OFFLINE  

Eric
  • Senior Member
  • Member No: 41778
  • 987 Thanks
  • 669 posts
  • Location: Wisconsin

Posted March 13, 2016 - 12:40 AM

Just a thought but did you replace the coil? Sometimes you can inadvertently put the wrong coil on these engines or possibly the wrong spark plug cable. Sorry I haven't read through all of this post but that may be a problem.
  • accidentalchild said thank you

#83 accidentalchild OFFLINE  

accidentalchild
  • Senior Member
  • Member No: 68112
  • 365 Thanks
  • 444 posts
  • Location: United States

Posted March 13, 2016 - 01:02 AM

Just a thought but did you replace the coil? Sometimes you can inadvertently put the wrong coil on these engines or possibly the wrong spark plug cable. Sorry I haven't read through all of this post but that may be a problem.

i have not replaced the coil on this tractor. Thanks for your help though.
  • Eric said thank you

#84 accidentalchild OFFLINE  

accidentalchild
  • Senior Member
  • Member No: 68112
  • 365 Thanks
  • 444 posts
  • Location: United States

Posted March 13, 2016 - 01:05 AM

More pictures.

Attached Thumbnails

  • image.jpeg
  • image.jpeg
  • image.jpeg

  • blackjackjakexxix said thank you

#85 Bruce Dorsi OFFLINE  

Bruce Dorsi

    Old, but not dead -- yet!

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 1525
  • 3,167 Thanks
  • 2,142 posts
  • Location: New Jersey

Posted March 13, 2016 - 08:32 AM

 Anything else I should be doing while I have this opened up?

 

Carefully remove all traces of the old gasket from the block & head, being careful not to gouge the head or block.

 

Clean the carbon from the block, head, piston & valves.

 

I don't know which tools you have available.  ....A putty knife or gasket scraper will help.  ....Do not use a screwdriver ! ....."Scotch-Brite" type material can be used to polish the mating surface of the block, once all traces of the old gasket has been removed. 

 

With the piston all the way up, and both valves closed, clean the carbon & residue from the piston & tops of the valves.

 

The easiest way to clean the valves is with a wire brush.  ....Rotate the engine to get either valve fully raised.  ...Use the wire brush to "scrub" around the underside of the valve head, and valve seat.  .....Rotate the engine to fully raise the other valve, and do the same thing.

 

Having a source of compressed air makes it easy to blow debris off, and out of the head bolt holes.

 

If you see anywhere on the head where the gasket may not seal, you can flatten the head gasket sealing surface by laying a sheet of sandpaper on a flat surface (such as a piece of glass or kitchen counter) and rubbing the head on the sandpaper.  ...You can quickly tell if the head is flat by checking for a full, uniform pattern where the head gasket contacts the head.


  • Bolens 1000, LPBolens, blackjackjakexxix and 4 others have said thanks

#86 LPBolens OFFLINE  

LPBolens

    Tractorholic

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 874
  • 1,176 Thanks
  • 882 posts
  • Location: North Central Illinois

Posted March 13, 2016 - 10:09 AM

And DO NOT use coarse sand paper on your flat surface. You want to clean and flatten the head, not gouge the mating surface. You can also use a thick slurry of polishing compound and water on a piece of glass.
  • blackjackjakexxix, TomLGT195, AA Hayes and 2 others have said thanks

#87 accidentalchild OFFLINE  

accidentalchild
  • Senior Member
  • Member No: 68112
  • 365 Thanks
  • 444 posts
  • Location: United States

Posted March 13, 2016 - 03:31 PM

Has anyone ever used a soda blaster to clean all the carbon and block up?
  • blackjackjakexxix said thank you

#88 MiCarl ONLINE  

MiCarl
  • Senior Member
  • Member No: 75926
  • 827 Thanks
  • 473 posts
  • Location: Livonia, MI

Posted March 13, 2016 - 03:49 PM

Has anyone ever used a soda blaster to clean all the carbon and block up?

 

You want to mask off the mating surfaces if you do that.  They need to stay flat.


  • blackjackjakexxix and accidentalchild have said thanks

#89 Bruce Dorsi OFFLINE  

Bruce Dorsi

    Old, but not dead -- yet!

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 1525
  • 3,167 Thanks
  • 2,142 posts
  • Location: New Jersey

Posted March 13, 2016 - 05:10 PM

Has anyone ever used a soda blaster to clean all the carbon and block up?

 

No, I haven't, but I wouldn't do it if it were mine (which it isn't) .

 

Although the soda is a very mild abrasive, it is nevertheless an abrasive

 

I'm concerned that the grit would get into the clearance between the piston and bore, the ring lands, and valve guides.  ....This would just accelerate wear.


  • blackjackjakexxix and accidentalchild have said thanks

#90 accidentalchild OFFLINE  

accidentalchild
  • Senior Member
  • Member No: 68112
  • 365 Thanks
  • 444 posts
  • Location: United States

Posted March 13, 2016 - 05:47 PM

No, I haven't, but I wouldn't do it if it were mine (which it isn't) .
 
Although the soda is a very mild abrasive, it is nevertheless an abrasive
 
I'm concerned that the grit would get into the clearance between the piston and bore, the ring lands, and valve guides.  ....This would just accelerate wear.

thanks Bruce, I was thinking about how well it cleans the outsides of a carb. I certainly don't want to risk it.
  • blackjackjakexxix said thank you




Top