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NAA engine swap to 134 ci industrial CONN6015-G

R

RSouth

New User
I bought a NAA in the spring to learn shortly thereafter that the engine was in bad condition. I found a overhauled CONN6015-G
engine locally which the seller said was the same identical engine as the original. I learned that this is a sleeveless engine
but for the most part he was correct. I swapped it out in order to keep using my tractor until I can overhaul the other original
engine.
The manifold is slightly different then the original in that it is slightly offset and seems slightly heavier in design. I
mounted my original manifold and Marvel TSX428 carb.
Does anyone have experience with this type conversion? With this setup, I can get the engine to barley run but having to use
full choke, then it floods and begins to quit until I release the choke. Then once the choke is released it starts to run again
for a very short time then begins to quit again until I give it full choke.
I'm wondering if I need to switch to a different carburetor, install the original manifold with a different carburetor or just
what in order to get her going?
Any help and knowledge would be a great help.
Thank you,
Ron
 
the engine is not the problem, unless it had some other internal problem.

Your NAA carb should work on that 134ci replacement engine ( my naa has a replacement sleevless engine on it as well )

Make sure your old manifold is not cracked and that it is installed correctly, good gasket.

I think I'd have used the manifold that came with the engine and just swapped my carb to it.

As UD said.. the first check you always do is to check spark.. because it's cheap, and easy and fast, and then lets you rule out electrics and focus on things like fuel, etc.

during swapping, you may have even knocked some crud loose in the carb... but double check that manifold.
 
Thank you UD and Soundguy very much for your replies. I have checked the spark and have nice blue white fire, static timed it at 8 degree before TDC on number one cylinder. The carb is the original from the other engine and did run very rich before and was never able to get it to lean out properly. I think I will do as us suggest and install the manifold that came with the new engine, rebuild the carb and see what happen. I did re-torque the manifold with a new gasket, installed all new plugs, wires, cap and rotor button so I feel pretty sure I'm ok in spark. Timing seems very critical/touchy as I've moved it just a hair to see if I can get it to keep running. It seems to prefer advanced vs retarded timing as it will not even fire if I move it just a bit out of the 8 degree before TDC on number 1.
As much time as this has taken I might have been better off rebuilding the old one lol...

Thanks again so very much.
If swapping out the manifold and rebuilding the cvarb works, I will be sure to let you know.
 
Got it going today finally, I swapped out the manifold as discussed, took the carb apart and cleaned and re-assembled re-timed it again, static, I ended up figuring out that the only items that I did not replace with new is the wires. Found out the hard way when I static timed it and got a really good jolt. New wires, clean carb, swapping manifold and assembled with a new manifold gasket and sprayed it with copper gasket sealer. Carb is still way to rich but at least was able to get it going and get it timed. Timing advances nicely to 29 degrees and 2150 rpm and right at 8 degree at 500 rpm's. The carb had no power jet and was wondering if that might have been the reason for running so rich but did read that the TSX-428 does not have a power jet. Not sure if that is correct or not but this one def does not have one.
Thanks again for your ideas and responses..
Ron
 
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