The coil spring in the oil pump holds the check ball in place preventing the oil from entering the engine until there’s three pounds of oil pressure in the engine. Some oil will return to the tank but a lot of it will escape through the crankcase breather onto the floor. When the engine does start, it tries to pump all that oil back to the tank, which is virtually impossible. This condition is called sumping and makes starting the engine very difficult. The oil pump has a check ball held against a seat by a coil spring which prevents the contents of the oil tank from just running into the pump and consequently filling up the crankcases with oil. The evolution’s external filter requires two oil lines one line feeds oil into the filter and the second line takes the filtered oil back to the oil tank.īoth the shovelhead and evolution use a gravity fed oil system, which means the oil going from the tank uses gravity to find its way to the feed side of the oil pump. The design of the oil filter on the shovelhead uses one oil line, which feeds the oil back through the filter and into the oil tank. The main difference between the two filters is the oil filter on the shovel is mounted in the oil tank, while the evo has the oil filter mounted externally, first on the right frame rail and then on the engine, below the front cylinder. Both engines use an oil filter to keep dirt particles and contaminates to a minimum. Shovelhead and evolution engines share the same lower end assemblies with slight variances, depending on how the cylinders and heads are bolted on. There are only three oil lines needed to make your bike run: the feed from the oil tank to the oil pump which is located on the engine, the return line from the engine to the oil tank, and the breather line from the engine to the oil tank. Routing the oil lines from the oil tank to the engine is simple task. Real-Life Gypsy Stories with Scooter Tramp Scotty.Just The Facts, Ma'am: The non-fiction department.1933 VL - Rebirth of an American Classic.
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