I have 1974 l225 kubota with less than 400 hrs on it. Runs great! Today I was grading road , 1500 rpm and started knocking like hell after warmed up and under load. Stop tractor for 2 min and knock quits .oil level good, pressure good so not a rod. How do I determine which injector it is?? Tks to all .
Injector knock
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85Hokie
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Could be water in line or possible air? Is your fuel source clean? Check all your filters? Should be time to change all them around 400 hours? If it went away I would suspect air or water in the line. For less than $20 - I would change fuel filters.
North Idaho Wolfman
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Just because the knock "went away" does not mean it's not a rod or main bearing. They can spin and relock and hold for some period.
Did it dump smoke when it knocked? and if it did what color was it?
If it's an injector problem, when it does it again stop the tractor and pull the injectors the one that has left the combustion chamber wet is the problem.
Changed fuel filter and filled up with fresh fuel and knock went away. Must have been starving for fuel. Only about a gal fuel in tank and I was pulling load up a grade when knock happened. I went back and duplicated my actions just before knock and all now appears normal. Thanks to all for advice.