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john deere A rebuild

N

Nick167

Member
Would his be hard for a amuteur engine rebuilder? My dads friend asked me to rebuild his JD A after I'm finished with the ford 8n I'm doing which my first rebuild I wanted to ask you guys here and see what you guys would think.
 
Not really that hard of work but make darn sure he knows he will have more in doing a rebuild than the tractor will ever sell for. You can by good JD "A" tractors with zero engine issues for $1500-2500. You will easily have that in it if you have to replace the pistons or have it bored out.
 
Nick,

They are not that tough, but be REAL sure you know what you are doing if you do it for someone else. You really struggled through the first overhaul, I would get more experience on your own equipment.
 
John Deere A is not a sleeved engine block. If it needs it you will have to get oversize pistons and bore the block to size.
 
Nick,

As stated, it is not a sleeved engine, will to have the block removed and bored with new pistons.
 
JD,

I would add some snort to it if I was boring and replacing pistons. Get the compression ratio up nicely.
 
Must be. Every time some first time tractor owner buys one,they say it's because anybody can fix one with a screwdriver and a pair of pliers.
 
And if you bore the block a sand hole will probably appear that will cause trouble for the owner a little later, who in turn will blame you.

Best just to decline to work on it.
 
Thanks everyone for all the replies and David I do have a lot to learn he is an family friend he grew up with my dad. Its not a sure thing he had just mentioned it I will talk with him when I get my projects done thanks again everyone
 
(quoted from post at 10:47:27 08/03/14) I think this guy just wants new rings and maybe new sleeves are these availible?
Click to expand...

sleeves ?
Only sleeved two cylinder tractors were the starting engines on the diesels and the 435/440.
 

I'm not a JD guy but most will tell you that simply because the pistons run foolishly back and forth instead of up and down gravity causes the bores to get way out of round on anything with a lot of hours. Hence re-ringing is not usually realistic.
 
I did not know they weren't sleeved I was assuming that. I
prefer the up and down movement but now that you mention
that it would wear different
 
(quoted from post at 20:22:01 08/03/14)
I'm not a JD guy but most will tell you that simply because the pistons run foolishly back and forth instead of up and down gravity causes the bores to get way out of round on anything with a lot of hours. Hence re-ringing is not usually realistic.
Click to expand...

Check every engine. They all wear the bore into an out of round egg shape.
 
Your right they all do wear it seems like they would wear
more because they are laying down rather than up and down
 
(quoted from post at 16:38:27 08/04/14) Your right they all do wear it seems like they would wear
more because they are laying down rather than up and down
Click to expand...

The force of gravity is minor compared to stresses during compression, combustion, power stroke. Plus being jerked to a full stop, then accelerated to full speed twice per crank rotation.
 
(quoted from post at 18:13:55 08/03/14)
(quoted from post at 20:22:01 08/03/14)
I'm not a JD guy but most will tell you that simply because the pistons run foolishly back and forth instead of up and down gravity causes the bores to get way out of round on anything with a lot of hours. Hence re-ringing is not usually realistic.
Click to expand...

Check every engine. They all wear the bore into an out of

True,dosen't make any difference weather the engine is verticle,laid over to one side,horizontal,V or upside down.














]
Click to expand...
 
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