After repair, NAA won't start

petertay

Member
This NAA gets used weekly and runs fine. I took things apart to replace the valve cover gasket and push rod cover gasket on the side. Took off the gas tank and pulled the distributer. All put back together now and it wont start.
? Spark plugs are new (AL437). Fireing order: 1243
? I static timed it with rotor pointed at #1 plug. I'm sure the timing is correct, because a timing light flashes on the 8 degree line while running the starter.
? The flywheel is numbered from 0 to 30 or 40, but there are no numbers on the other side of zero, so all the numbers must BTDC. Right? It's not a matter of confusing the numbers on the flywheel.
? All the plugs show good spark with a spark tester.
? Pulled the gas line from the carb and there is good fuel flow.
The engine doesn't even putt as I run the starter.

Any ideas? Thank you for your help! --peter
 
Are you sure the distributor is not installed 180 out. You may have to pull the valve cover back off to make sure the valves are closed when the dist hits no 1 plug.
 
Another way to check would be to pull number 1 spark plug out and crank the engine with a finger in the spark plug hole. When it blows your finger out it is coming up on compression and you can check to see where the rotor is at that point.

Mark
 
Thank you for the suggestion about the distributer being 180 off. It doesn't seem like it, because it has an oiler tube on it which projects out for easy access. If the distributer were backwards, the tube would be against the block instead of out in the air. More importantly, the base shaft of the distributer has a punch mark on it which lines up perfectly with a mark on the block, so it sure seems as if it is in correct position.
 
What they are trying to tell you, is that the timing marks on flywheel will show in the window once the number one piston is at TDC on exhaust stroke and again at TDC on compression stroke. You have to determine which is TDC-compression and install distributor at that point, not at TDC exhaust stroke. You can detrermine compression by thumb over spark plug hole by feeling compression just befor TDC-compression or by observing the rocker arms to see both valves closed on compression stroke, but not on exhaust stroke.
 
You have the distributor CASE back in the same position. That does not mean that the distributor SHAFT is in the same position.

The end of the shaft is not indexed to only fit one way when it is installed. If you turned the engine any or spun the shaft any, then you are out of time.

Like everyone said more than likely 180 degrees.

HTH
Keith
 
or... move your wires on the top of the dist.cap around two ports.. that will move the timing 180 degrees as well.
 
Still not running this evening. Thank for the advice. Have the manual and followed it precisely. Oh well, a tractor mechanic will stop by
tomorrow. I'll let you know what I had wrong. --Peter
 

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