the problem with the early 4.6L engines was that the oil pump relief valve bore was just the aluminum front cover and when too thick oil was used the valve would slam back and wear the bore , then the relief valve would stick and oil pressure would exceed 100 psi , making even Motorcraft filters swell . Ford started putting a hardened sleeve in the relief bore and the problem was for the most part history. I remember seeing that issue a few times.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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