NAA won't start after hitting object with brush hog

gregwithNAA · Sep 14, 2014

Had my NAA tractor a year now. Early this summer using brush hog I hit an object (stump or rock) which killed the tractor. Haven't been able to get it to run since except last weekend I changed the points and rotor. It started right up but ran rough and smoked like it was flooded. It ran for 5 minutes like that then it stopped and would not start again. I'm not getting spark to plugs now either. Before hitting the rock I was having a hard time getting it started. I also replaced the coil and plugs. Could hitting the object while mowing knocked the timing so far our of whack that I can't even get spark to the plugs? Any other ideas for me to try? Thanks.

Steve@Advance · Sep 14, 2014

Hitting something would not have knocked the engine out of time.

I would revisit the distributor, check bushings for excess side play. If the bushings are worn the points cannot be properly set. (Hint, if the bushing is worn, an electronic conversion kit will work with worn bushings! )

Also check the wiring, the connections to the points, the wire from the coil, and check for voltage to the coil. The sudden shock from hitting the object could have disturbed a faulty electrical connection or created an intermittent short if the insulation is bad. Also check the ignition switch, another possibility of intermittent connection or high resistance.

If it still acts like it's flooding, it could be... You may have more than one problem. The float could be leaking or set too high, or trash in the needle valve.

Black smoke is a symptom of flooding. Eye burning, raw gas smell is a symptom of intermittent spark.

El Toro · Sep 15, 2014

Pull No1 sparkplug near the radiator and bring that piston to tdc on the compression stroke. Then remove the distributor cap and see where your rotor is pointing. Should be pointing to the No1 plug tower on the cap. Hal

gregwithNAA · Sep 15, 2014

Thanks Steve. The wiring to the distribution is getting power. Checked that last weekend. The distributor could be worn since there was a little play. Will have to check into that further.

gregwithNAA · Sep 15, 2014

Thanks Hal. I'll have to check this too. If it doesn't line up what is the cause? Timing or worn distributor? It will be a week or two before I can check these out. Tractor is at farm which is a 3 hour drive.

El Toro · Sep 16, 2014

An easy way to bring No1 piston to tdc on the compression stroke is to have a helper slowly hand crank the engine while you hold your thumb over the plug hole. Once you feel pressure drop a long plastic on top of the piston then you watch the straw rise as the engine is slowly cranked. When the straw quits rising your No1 piston should be at tdc on the compression stroke.

Then look at your rotor to see where it's pointing. If it's not at your No1 plug tower something was damaged inside your engine. Probably the cam gear. Take a good mechanic along to help you. Hal

El Toro · Sep 17, 2014

Also look at your timing marks when No1 piston is at TDC on the compression stroke. My sister had a Ford car that had a timing gear fail. It looked to be plastic or nylon. Hal

gregwithNAA · Jan 3, 2015

Thanks to all for your help. I ended up taking the tractor into the shop and they got it running. The distributor assembly was replaced. I noticed it had sloppy movement but didn't know how much of that was ok. Now I have a better idea.

NAA won't start after hitting object with brush hog

gregwithNAA

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