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techtalk:ref:engmech04m [2022/01/03 23:39] hippysmack [Why Oil Pukes Out the Breather or Air Cleaner] |
techtalk:ref:engmech04m [2022/01/03 23:46] hippysmack [Things you can try to reduce oil carryover] |
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| * During engine down time. | * During engine down time. | ||
| * During high revs. | * During high revs. | ||
| - | - Over filling the oil tank: ((Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=518948&highlight=cam+chest+breather)) [[techtalk:ref:oil01#overfilling_the_oil_tank|Click Here]] to read more on overfilling the oil tank. \\ | + | - Over filling the oil tank: ((Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=518948&highlight=cam+chest+breather)) \\ [[techtalk:ref:oil01#overfilling_the_oil_tank|Click Here]] to read more on overfilling the oil tank. \\ [[techtalk:ref:oil20|Click Here]] to read more on Oil Tank Pressure. |
| * If the puking starts after you top you're oil tank, this is probably the problem. \\ If you fill the oil tank to the full mark while some oil has wet-sumped down into the engine, you have too much oil in the system. \\ The oil from the sump will be pumped back up to the tank, dribble down the vent tube to the timing cover, from where it is fired out the engine breather. \\ This puking will continue after initial start up until all the excess oil has been fired out, which can take a while. | * If the puking starts after you top you're oil tank, this is probably the problem. \\ If you fill the oil tank to the full mark while some oil has wet-sumped down into the engine, you have too much oil in the system. \\ The oil from the sump will be pumped back up to the tank, dribble down the vent tube to the timing cover, from where it is fired out the engine breather. \\ This puking will continue after initial start up until all the excess oil has been fired out, which can take a while. | ||
| * The cure is to drain a quart or so out of the oil tank, run the engine for five minutes until the puking stops, then top up the oil tank to the full mark. | * The cure is to drain a quart or so out of the oil tank, run the engine for five minutes until the puking stops, then top up the oil tank to the full mark. | ||
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| ====== Things you can try to reduce oil carryover ====== | ====== Things you can try to reduce oil carryover ====== | ||
| - | - Check to make sure you haven't overfilled the oil tank. \\ Topping off the oil tank on a cold engine is a common mistake. | + | - Check to make sure you haven't overfilled the oil tank. Topping off the oil tank on a cold engine is a common mistake. \\ Also in regard to lowering the oil level in the oil tank: |
| * 1957-2003 oil tanks are metal. | * 1957-2003 oil tanks are metal. | ||
| - | * They have plenty of unrestricted air inside and do not require one to lower the oil level to the low mark on the dipstick. | + | * They have plenty of unrestricted air inside and do not require one to lower the oil level to the low mark on the dipstick. |
| - | * 2004-Up oil tanks are plastic. \\ They are poorly designed in general to handle what they are asked to do. \\ There is an excepted practice of lowering the oil to the bottom dipstick mark on 2004-up Sportsters. \\ This is sort of a band-aid to the real issue being oil tank construction, but reportedly does work to keep down excess oil out the breathers. | + | * 2004-Up oil tanks are plastic. |
| + | * They are poorly designed in general to handle what they are asked to do. \\ There is an excepted practice of lowering the oil to the bottom dipstick mark on 2004-up Sportsters. \\ This is sort of a band-aid to the real issue being oil tank construction, but reportedly does work to keep down excess oil out the breathers. | ||
| - Check for oil seepage around gaskets. \\ The crankcase should only allow oil / mist to escape in one place, the breather valve(s). \\ Ultimately it breaks down to whether your breather valve(s) can handle pressure changes fast enough. | - Check for oil seepage around gaskets. \\ The crankcase should only allow oil / mist to escape in one place, the breather valve(s). \\ Ultimately it breaks down to whether your breather valve(s) can handle pressure changes fast enough. | ||
| * Pushrod tube gaskets / O-rings seem to be the weakest joints on Ironhead Sportsters. \\ If you keep replacing them due to leaks, you might want to check the breather valve (1977-1985) or breather timing (1957-1976). | * Pushrod tube gaskets / O-rings seem to be the weakest joints on Ironhead Sportsters. \\ If you keep replacing them due to leaks, you might want to check the breather valve (1977-1985) or breather timing (1957-1976). | ||
