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706 gas question/suggestions

M

MattSillinois

Member
I have a 706 gas that keeps fouling plugs, someone told me to put a little hotter plugs to help that from happening. I currently have Champions D21 in there now. Is that a good thing or not? If so what would be a better plug?
Also the screw for the points is not hold tight, would loctite work for that or split washer or ????
Thanks in advance guys.
Matt (newbee still learning)
 
Are the plugs being fouled with oil? If so chances are that your rings are worn and you are pushing oil past the rings. If that is the case the only real fix is new rings. If you are on a budget you could try to get by on the cheap. I don't like to do this as a rule but sometimes it will work okay. If the sleeves don't look to worn you might get buy honing the cylinders and putting in new rings. You would want to take a pretty close look at the rod bearing while you had them out too. I would also probably take the head to a shop and have the valves done.
 
Had a local guy check compression and he said that they all cylinders are above specs. If I remember correctly almost 200lbs/high 180-190s I think?
Matt
 
you need to get it out in the field and get it under a good load and work it for 1/2 day. that will clean up them plugs, and then you can monitor it from then on how much oil you are going through.this idling around yard with no load is no good.no sense over hauling till you know it needs it. even if it burns 1 quart in a long day i would just put up with it. you need to justify your decision.
 
190 psi is pretty darn good cyl pressure. Run 93 octane in it, or, octane booster. Had a 460 with a 263 combine engine that had cyl pressure like that, would not run on 87. Get the distributor fixed and run it light duty till it starts running better. Find a dyno to tune it up if the mechanic thinks its up to the task.
 
D21 is considered the "hot" plug. I don't know of any that are hotter.

We had lots of problems with plug fouling after they took the lead out of the gas. We could minimize it by not leaving the tractor sitting idling for very long.

Keep it revved up and moving, or shut it off.

We don't have any 6-cylinder gas tractors on the farm now, but I've had a hankering for a 460 or a 560 to add to the collection.

The 4-cylinders do end up with a gas fouled plug from time to time, but Dad's got a pneumatic spark plug cleaner. That thing is slick. It sandblasts the plugs and they come out looking brand new.
 
Had a 656 gas that fouled the back plug from the day it was bought new. A good workout in the field made it better. But when we worked it in the field sooner or later that back plug would work loose. My uncle bought one and it did same thing to the back cylinder. Local dealer said we weren't the only ones with that problem. We carried plug socket in toolbox and when would worked loose we would stop and tighten it--simple solution.
 
Had a 656 gas that fouled the back plug from the day it was bought new. A good workout in the field made it better. But when we worked it in the field sooner or later that back plug would work loose. My uncle bought one and it did same thing to the back cylinder. Local dealer said we weren't the only ones with that problem. We carried plug socket in toolbox and when would worked loose we would stop and tighten it--simple solution.
 
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