We have been trying to get a 39 JD B started after several years of sitting and we were working on getting spark from the magneto, we finally got it...
we got first spark and tractor started
-Ran tractor for 20 minutes in driveway no issues.
-Put in garage noticed water in oil
-Changed oil and filter with new detergent oil.
-Tried to start and started for 2 seconds and died never to spark again. Plulled magneto and found broken shaft.
-Replaced broken mag shaft with used working shaft assembly and tractor started and ran for 5 minutes and mag shaft broke again while I was gently pulling forward
Why does the shaft break in the two magneto's after only a few minutes of operation, both had free spin movement and not much play side to side? The shaft broke in the middle and sorta look like it was twisted apart. Any ideas?
we got first spark and tractor started
-Ran tractor for 20 minutes in driveway no issues.
-Put in garage noticed water in oil
-Changed oil and filter with new detergent oil.
-Tried to start and started for 2 seconds and died never to spark again. Plulled magneto and found broken shaft.
-Replaced broken mag shaft with used working shaft assembly and tractor started and ran for 5 minutes and mag shaft broke again while I was gently pulling forward
Why does the shaft break in the two magneto's after only a few minutes of operation, both had free spin movement and not much play side to side? The shaft broke in the middle and sorta look like it was twisted apart. Any ideas?