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NAA rotor direction

O

Olliejunkie

Well-known Member
Working on the neighbors naa. I put new points , condenser, plugs and wires on it. That was a while back. Today I finally got around to starting it but it runs like the firing order is off. I'm wondering if someone has messed up the distributor and number 1 is not where it shows on cap. I think number 1 on the cap is to the right and rear of the engine. I'm curious if that's normal. Next time I get over there I will have to find tdc on number 1. Its in a dark barn and at dusk I couldn't see so I had to quit.
 
MANY old tractors have had the distributor removed over the years and installed with the gears meshed so the #1 nipple is in a non-standard location, and it makes no difference, as long as the rotor is pointing at the #1 terminal when #1 is supposed to fire and the other wires are arranged in firing order from there.

1-2-4-3 clockwise, can be a little confusing to some as the previous model, the late 8N, was the same firing order, but the distributor rotated CCW.
 
I watched a video that showed it in approximately the same location. I will have to find tdc number 1 and go from there. The firing order is a little odd to me. Lol. It has ran in a long time and I dont know that it ran good then.
 
I had an 850 tractor I worked on for a guy that had the firing order way off. I simply started moving the plug wires one nipple at a time around the cap till it fire up and ran well. I ended up moving them 2 nipple and it fired up and ran fine on all 4 cylinder.
 
Well...that would be simple enough to try. I will probably go ahead and run a compression test tomorrow so there will be no more guessing on that.
 
Yes a compression test is a good idea also. Did a job last summer where the guy had a 641 that was lacking power. Check the compression and found #2 and #3 cylinder had very low compression. Pulled the head and found the head gasket blown between the 2 cylinders
 
Yep. I dont know the history on it. Neighbor bought it 20 years ago or more. Could have some sticky valves among other things.
 
I have been working on it off and on for years. Like a fool I pulled all the wires off with out checking first.
 
The distributor appears to be in right. It has no compression on number 3. I'm hoping for a sticky lifter as I would rather not take the sheet metal and tank off. I had a 8n once that the lifters stuck on. I'm hoping the naa is the same.
 
One way to check if it is an exhaust valve is pour some ATF down the exhaust and have #3 plug out. If it has a stuck exhaust valve on #3 the ATF will come out of the plug hole. Only draw back is after you do that you will need to pull all the plugs out and spin it over to clear all the cylinder of ATF but the ATF will help all the exhaust valve if sticking
 
That is a good thought but it has underslung exhaust. I could take my air compressor and blow air in it. I think I will pull the side cover first and check the lifters. I dont recall it popping back in the carb. Now that it kinda runs I should just go get it. I hate working on stuff away from home.
 
Yes working on stuff away form your shop makes it hard to have the right tool on hand I run into that all the time because I do a lot of mobile tractor repair for people in this area
 
Besides...I like taking thinking breaks frequently. I just remembered I have a oscilloscope I'm going to take over and see what I can see.
 
Got the rocker cover off far enough to see it is a stuck valve. Did some research that says I can remove rocker cover without removing tank so guess I will try that tomorrow. Seems like it has other problems but I suppose that's the pressure going back in the intake.
 
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