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techtalk:ih:engmech07a [2019/12/06 02:03] hippysmack [Timing the Breather Valve] |
techtalk:ih:engmech07a [2019/12/06 06:19] hippysmack [Timing the Breather Valve] |
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| ====== Timing the Breather Valve ====== | ====== Timing the Breather Valve ====== | ||
| - | **Caution**: \\ | + | |
| - | Improper breather timing causes poor oil scavenging from flywheel cavity and incorrect crankcase air pressure. ((http://nightrider.com/biketech/download/ssmanuals/sportster_stroker.pdf)) \\ | + | * **Caution**: \\ |
| - | These conditions may cause unwarranted engine oil leaks around gaskets and seals and probable oil burning due to oil blow by past the piston rings. \\ | + | * Improper breather timing causes poor oil scavenging from flywheel cavity and incorrect crankcase air pressure. ((http://nightrider.com/biketech/download/ssmanuals/sportster_stroker.pdf)) \\ These conditions may cause unwarranted engine oil leaks around gaskets and seals and probable oil burning due to oil blow by past the piston rings. |
| + | * Improper pinion gear spacing may cause incorrect breather timing and poor oil scavenging from flywheel cavity. \\ This condition may cause unwarranted engine oil leaks around gaskets and seals and probable oil burning due to oil blow by past piston rings. | ||
| + | * Improper pinion gear spacing may cause unwarranted contact between pinion gear shim and pinion shaft splines resulting in damage to gear cover and / or other engine components. | ||
| Rotate the engine to get the advanced timing mark in the timing window as above. \\ | Rotate the engine to get the advanced timing mark in the timing window as above. \\ | ||
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| It is not uncommon to have the DOT slightly to the left just entering the notch of the pump. ((Monte03 of the XLFORUM http://xlforum.net/forums/showthread.php?t=170686&page=2)) \\ | It is not uncommon to have the DOT slightly to the left just entering the notch of the pump. ((Monte03 of the XLFORUM http://xlforum.net/forums/showthread.php?t=170686&page=2)) \\ | ||
| - | Then reinstall the pinion gear. It should have one larger spline to engage the shaft and it can only go on one way and have the line facing out. ((chevelle of the XLFORUM http://xlforum.net/forums/showthread.php?t=170686&page=3)) \\ | + | **Then reinstall the pinion gear**. It should have one larger spline to engage the shaft and it can only go on one way and have the line facing out. ((chevelle of the XLFORUM http://xlforum.net/forums/showthread.php?t=170686&page=3)) \\ |
| It's a light press fit onto the pinion shaft. \\ | It's a light press fit onto the pinion shaft. \\ | ||
| You can heat the gear up in a grill, oven or with a propane torch just enough to make it expand enough to slide it back on the pinion shaft. \\ | You can heat the gear up in a grill, oven or with a propane torch just enough to make it expand enough to slide it back on the pinion shaft. \\ | ||
| It should not be heated to 'red hot' but just enough to allow it to expand some. \\ | It should not be heated to 'red hot' but just enough to allow it to expand some. \\ | ||
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| + | The pinion gear should be installed onto the shaft so that the outer face of the gear is 5/16" outboard of the gasket surface. ((needspeed of the XLFORUM http://xlforum.net/forums/showthread.php?p=5792984#post5792984)) \\ | ||
| + | In that position the oil pump drive gear has a lot of end play between the shaft shoulder and the back of the pinion gear as shown in your picture. \\ | ||
| + | When the engine runs the drive gear is thrust against the back of the pinion gear. \\ | ||
| + | So if you time the pump with the gear in the opposite direction pushed against the shaft shoulder it's very easy to get the lineup off a tooth. \\ | ||
| + | If you are going to pull the pinion gear off you'll need to determine the position where the drive gear will end up with the pinion gear installed. \\ | ||
| + | Measuring from the gasket surface the length of the gear minus 5/16 should do it. \\ | ||
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| **Note**: | **Note**: | ||
