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| techtalk:ih:engmech07a [2019/12/06 06:26] – [Timing the Breather Valve] hippysmack | techtalk:ih:engmech07a [2023/12/26 20:32] (current) – hippysmack | ||
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| ====== Finding the advance timing mark on the flywheel ====== | ====== Finding the advance timing mark on the flywheel ====== | ||
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| {{: | {{: | ||
| - | The flywheel needs to be positioned so the advance timing mark on the front cylinder is in the timing window. ((photo by FinkRod67 of the XLFORUM annotated by Hippysmack | + | The flywheel needs to be positioned so the advance timing mark on the front cylinder is in the timing window. ((photo by FinkRod67 of the XLFORUM annotated by Hippysmack |
| The FSM says to remove the timing plug, rotate the engine until the advance timing mark is centered in the timing hole. \\ | The FSM says to remove the timing plug, rotate the engine until the advance timing mark is centered in the timing hole. \\ | ||
| See also [[techtalk: | See also [[techtalk: | ||
| \\ \\ \\ \\ \\ | \\ \\ \\ \\ \\ | ||
| - | **However, any particular bike may not have the original flywheels**. So it is most important to always do a simple check to verify which mark to use on the flywheel. ((IronMick of the XLFORUM | + | **However, any particular bike may not have the original flywheels**. So it is most important to always do a simple check to verify which mark to use on the flywheel. ((IronMick of the XLFORUM |
| Aftermarket flywheels have been know to have the timing marks cut wrong also. \\ | Aftermarket flywheels have been know to have the timing marks cut wrong also. \\ | ||
| - | Pull the front spark plug, and using a wooden dowel or a drinking straw, feel the piston come up as you rotate the engine. ((shovithead of the XLFORUM | + | Pull the front spark plug, and using a wooden dowel or a drinking straw, feel the piston come up as you rotate the engine. ((shovithead of the XLFORUM |
| Before it gets to the top, the advance mark will show. As the piston hits the top of the stroke, the TDC mark will come up. \\ | Before it gets to the top, the advance mark will show. As the piston hits the top of the stroke, the TDC mark will come up. \\ | ||
| The first mark to come up makes the motor fire " | The first mark to come up makes the motor fire " | ||
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| Normally. a single vertical line is the advance timing mark on earlier ironheads, not the dot. \\ | Normally. a single vertical line is the advance timing mark on earlier ironheads, not the dot. \\ | ||
| - | To state it another way, rotate the motor forward until the front piston tops out. ((ryder rick of the XLFORUM | + | To state it another way, rotate the motor forward until the front piston tops out. ((ryder rick of the XLFORUM |
| Check the mark, that is front TDC. \\ | Check the mark, that is front TDC. \\ | ||
| Now slowly rotate the motor backwards and the first mark you come to will be the front (advanced) timing mark for timing the breather valve. \\ | Now slowly rotate the motor backwards and the first mark you come to will be the front (advanced) timing mark for timing the breather valve. \\ | ||
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| Line up the timing hole on the breather sleeve gear on the oil pump to be in the notch (window) in the front. It may take a few tries to roll it into place. \\ | Line up the timing hole on the breather sleeve gear on the oil pump to be in the notch (window) in the front. It may take a few tries to roll it into place. \\ | ||
| Don't sweat it too much if you can't get the dot exactly centered in the notch. \\ | Don't sweat it too much if you can't get the dot exactly centered in the notch. \\ | ||
| - | It is not uncommon to have the DOT slightly to the left just entering the notch of the pump. ((Monte03 of the XLFORUM | + | It is not uncommon to have the DOT slightly to the left just entering the notch of the pump. ((Monte03 of the XLFORUM |
| - | **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 | + | **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 |
| 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. \\ | ||
| - | {{: | + | {{: |
| - | The pinion | + | Pinion |
| 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. \\ | 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. \\ | When the engine runs the drive gear is thrust against the back of the pinion gear. \\ | ||
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| Once the breather valve is correctly timed, the position of the flywheel and breather valve timing marks can be disregarded when installing timing gears (cams). \\ | Once the breather valve is correctly timed, the position of the flywheel and breather valve timing marks can be disregarded when installing timing gears (cams). \\ | ||
| - | {{: | + | {{: |
