Question about 2003 Harley Davidson XL 1200 C Sportster Custom

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Change oil,filter howlong should it take for oil to get back in crankcase

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The oil in a H-D engine does not reside in the crankcase. A Harley engine is a design known as a "dry sump" engine. The oil is stored in an oil tank. From there it is pumped into the engine to lubricate the parts. Once it has done that, it is pumped out of the engine, through the oil filter, and back to the tank.

When you the oil and the filter, it should not take but a minute or two to see the oil return to the oil tank. It must fill the filter first. Now, if the oil light will not go out, you may have an air lock in your oil feed line. If you feel this is the problem, remove the oil pressure switch, and the spin the engine with the starter and pump a few ounces of oil out to remove the air. Replace the switch and everything should be fine.

If you do not have oil pressure on your engine, it will be very evident. Your engine is equipped with hydraulic tappets. If you do not have oil pressure, these units will collapse and rattle loudly. There will be no doubt in your mind. Just start the engine and watch for the oil to start squirting back into the oil tank. You'll probably need a flashlight to see into the tank.

Posted on Jul 05, 2010


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Pressurized crankcase ?

Yes, more than likely the crankcase is being pressurized.

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There is a tester that measures crankcase pressures, but usually some other manifestation shows, like excessive oil consumption.

the PCV system draws crankcase fumes into the intake at idle and lower throttle situations. air going into the crankcase is filtered by the small PCV filter, where the oil shows up....

At highter throttle and lower intake manifold pressures, the system reverses, the PCV valve closes, and the fumes exit the crankcase VIA the breather filter. All of this is normal.

It costs tons less to periodically clean or replace the PCV filter.

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In all probablility, the oil is not being blown back through your carb but rather is being blown into your carb. In 1994, Harley went to a crankcase breater system that we refer to as "head breathers". If you remove your outer air filter cover, you'll see two large bolts that screw into each head of your engine. These are "union" bolts in that they are hollow and allow excess crankcase pressue to be blown into the air filter for recirculation through the engine to be burned. The EPA started requiring this back in late 80's but the lower crankcase vent system that Harley used caused even more problems and was changed to this system.

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Your PCV (Positive Crankcase Valve) has failed. The valve is designed to allow gas fumes in the crankcase to be recycled back through the intake and be burned off in combustion. There should be a black hose running into the airbox. It should also have a filter in the airbox. If you follow the hose to the engine itself it will end at the PCV. Replace the valve and the small filter in the airbox and this should resolve your problem as well as boost your fuel mileage.

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How much oil does a 2000 honda cbr 600 engine hold when changing the oil?

Generally any big bike can hold up to 3.5L oil with filter change.
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If good enough and answer your question just give a 4 thumbs up. Thanks

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