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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Yes, more than likely the crankcase is being pressurized.

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This engine holds one quart of standard Yamaha YZ 250 engine oil. The oil filter is located on the rear of the crankcase behind the suspension spring. The oil filter looks like a small metal can that is screwed into the top rear of the crankcase. On the bottom of the crankcase is the plug that will need to be removed to drain the oil from the crankcase. Anyone who owns this model dirt bike can complete this job in about 10 minutes.
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Or, you could remove the crankcase vent tube going up to the air filter. Put a piece of tubing about six inches long on the nipple coming out of the engine case and plug the hole in the backside of the air filter backing plate. Then, the oil will directed onto the ground instead of into your air filter.

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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.

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If good enough and answer your question just give a 4 thumbs up. Thanks

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