AC kept punching and pushing that little engine until, with that last 160 cu in version, they claimed as much or more HP as the old low compression, slow turning 226 in the WD45. Well maybe, but at a cost. That 160 is the only engine I recall having a pre-ignition/knocking problem. If the timing and/or fuel wasn't just right, that knocking would lead to problems. I don't want to be an alarmist. And certainly some time spent checking peripherals is wise. But don't be surprised if you end up pulling the head. Hopefully cleaned surfaces, a new gasket, and maybe some new, better capscrews with a little extra torque is all that is needed. It is easy to work on.
I have a D15II with an AC side mounted mower which is my edge/ditch trimming machine. No engine problems, but it does pop out of third.
I still recall when my cousin [20 years my senior] bought a brand new D15II. What a sweet little tractor. He worked it hard for several years. After he traded it off the casual use home owner had problems with it. The knocking had chiseled a little groove right at the head gasket surface between a couple of cylinders!
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Today's Featured Article - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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