Replacement of the piston rings on my 1974 David Brown 996.
I have known the compression has been down on this engine since I bought the tractor.
She was breathing fairly heavily and was an absolute pain to start from cold.
I was expecting to find the rings worn, but not broken as I did find.
The reason I believe for the rings being broken was that the injection pumps cold start advance tap was seized in the advance position when I brought the tractor.
