NAA no power & overheating

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NAA no power & overheating

Ross	Today I did a full tuneup on my 1953 Jubilee, plugs, points, condenser, rotor and cap. I also removed the carburetor and cleaned it up. The tractor started ok but would barely run up to about 700 rpm and had no power and began to overheat. I also put on a new coil and forgot that this unit is positive ground and put the live wire on the positive side of the coil. Also I removed the weights inside the distributor and freed them up as they were rusty. The tractor ran well up until last week when it began to backfire and lose power this is why I did the tune up. Any suggestions as to what I have done wrong? Ross
Dave	Sounds like you have it way out of time, Or you crossed some plug wires, check the wires then try resetting the timing, with no power must be retarded way to much, did you check the gap on the points?
Bob G	I would take a look at the valve timing or timing chain. I am not sure what your engine has but since it is a overhead valve engine i think it should have a timing chain. May be worn and slipped a tooth. Let us know what you find. Good luck
Ross	Thank you Dave and Bob G for your responses. First, I have not checked the timing chain nor the timing itself as I left the distributor in place when changing the points and condenser. The engine runs smooth enough but will not accelerate or produce any power as my initial post indicates. Consequently I will try first to reset the timing as I confirmed that the firing order of 1,2,4,3 is correct and I set the points to .025 as per the manual. Sure hope that it is not the timing chain and don't think that it is as my reason for doing a tune up didn't happen as the result of any immediate loss of performance. The current symptom seems to be more like starvation for fuel and I did remove and clean the Carburetor at the same time. I will try re-timing the engine tomorrow and if that doesn't do the trick I will let you know. Thank you for your help and suggestions. For now; Ross
Bob G	"The tractor ran well up until last week when it began to backfire and lose power this is why I did the tune up". this makes it sound like you did the tuneup because it was running bad, and because you did not fix it with the tune up is why i suggested the timing chain idea. make sure you have a good flow of fuel from the tank to the carb. The 8n has three screens before the fuel gets into the carb. one in tank, one in sediment bowl and one in fitting going into the carb. Yours should be simialar I think. Good luck Keep us posted.
Jim Loveridge	The NAA uses timing gears, no chain. Ross, I would check the simple things first. Are you getting good fuel flow to the carb? There are two screens ahead of the carb. One above the sediment bowl and another up in the tank. BTW, When I replaced my coil I found that it had been wired wrong since who knows when. It ran just fine. Keep us posted.
Ross	Well the mystery is finally solved. It was the timing! Never had to re-time an engine before when simply changing the points as you only remove them from the plate and make sure the gap is set right. You folks have certainly helped greatly and very timely I must say. This is a great forum with great people at the helm. I was really beginning to worry as I use this tractor at least once a week between April and November for Cutting grass with a 72" finishing mower together with my wife on a 48" Ford LGT14D. I use it for grading the lane, cultivating and landscaping, sure would hate to have it inoperative for any length of time. Attached is the manual instructions for timing although I cannot find the described timing marks on the flywheel as shown. Maybe my father had it changed when he did a rebuild in the early 70's. When I acquired this tractor in 1989 I only had it painted, new tires and cosmetic repairs. This has only been the second time that I have done a tune up since I have owned it. Again thank you folks very much, you have been great! Ross
Ross	BTW I am from Southern Ontario Canada. Couldn't post more than 1 picture at a time.
Ross	Second page from basic timing.
Bob G	Glad dto hear you got it running! always great to et thme running again Good job!!
Ross Carter	As suggested I have checked everything mentioned and the overheating problem appears to be fixed along with the lack of power. Everything works well until I run the engine over 1500 RPM and then it starts to miss and backfire. As I mentioned before I had taken the balance weights out of the distributor and loosened them up with oil as they were seized. Just wondering if I did something wrong at that point. Ross
James T	somtimes the distribitor shaft bearing gets sloppy from lack of oil since the shaft is lubed from the outside of the distribitor manualy this causes the shaft to wobble and depending on the gap set to the points it will either give you a high speed miss or a low speed miss but alot of times you can correct this by closing the point a tad or opening them a tad depending or your situation in lew of rebuilding your distribitor

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