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techtalk:ref:engmech05k [2021/07/25 04:59] hippysmack [Measure the Barrel to Cover Clearance] |
techtalk:ref:engmech05k [2021/07/26 05:24] hippysmack [Install the Rocker Boxes] |
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| The oil is supposed to settle out in this little drain chamber and drain back to the motor thru the tiny hole in the cavity. \\ | The oil is supposed to settle out in this little drain chamber and drain back to the motor thru the tiny hole in the cavity. \\ | ||
| Crankcase air/oil mist rises up in each rocker box, hits the umbrella thus separating the oil from the air at that point. \\ | Crankcase air/oil mist rises up in each rocker box, hits the umbrella thus separating the oil from the air at that point. \\ | ||
| - | In theory, collision is the recipe for separating the oil mist from the air. \\ | + | By design, collision is the recipe for separating the oil mist from the air and the umbrella valves are the last collision point in the system. \\ |
| Most of the oil falls off the bottom of the umbrella back into the lower rocker box section where it falls back down into the engine. \\ | Most of the oil falls off the bottom of the umbrella back into the lower rocker box section where it falls back down into the engine. \\ | ||
| The residual air pressure runs past the umbrella, out a hole in each middle rocker section to a hollow bolt in each head (breather vents). \\ | The residual air pressure runs past the umbrella, out a hole in each middle rocker section to a hollow bolt in each head (breather vents). \\ | ||
| Line 45: | Line 45: | ||
| * (1) 1/8" drill bit to enlarge the drainback hole in the drain pool. | * (1) 1/8" drill bit to enlarge the drainback hole in the drain pool. | ||
| * Instructions | * Instructions | ||
| + | |||
| + | The measurements in the drawing below should considered (rough dims) as neither of the barrels included in that kit were identical. ((salmanmr of the XLFORUM http://xlforum.net/forums/showthread.php?p=5906708#post5906708)) \\ | ||
| + | |||
| (click on a pic to enlarge): \\ | (click on a pic to enlarge): \\ | ||
| + | {{:techtalk:ref:engmech:slobber_stoppers_instructions_pic3_by_salmanmr.jpg?direct&300|}} ((Drawing by salmanmr of the XLFORUM http://xlforum.net/forums/showthread.php?p=5906708#post5906708)) \\ | ||
| + | |||
| {{:techtalk:ref:engmech:slobber_stoppers_pic1_by_salmanmr.jpg?direct&300|}} ((Photo by salmanmr of the XLFORUM http://xlforum.net/forums/showthread.php?p=5906708#post5906708)) {{:techtalk:ref:engmech:slobber_stoppers_pic2_by_salmanmr.jpg?direct&300|}} ((Photo by salmanmr of the XLFORUM http://xlforum.net/forums/showthread.php?p=5906708#post5906708)) \\ | {{:techtalk:ref:engmech:slobber_stoppers_pic1_by_salmanmr.jpg?direct&300|}} ((Photo by salmanmr of the XLFORUM http://xlforum.net/forums/showthread.php?p=5906708#post5906708)) {{:techtalk:ref:engmech:slobber_stoppers_pic2_by_salmanmr.jpg?direct&300|}} ((Photo by salmanmr of the XLFORUM http://xlforum.net/forums/showthread.php?p=5906708#post5906708)) \\ | ||
| Line 51: | Line 56: | ||
| \\ | \\ | ||
| - | Below are app. dims of the barrel taken by XLForum member, salmanmr. \\ | + | Below are app. dims of one of the barrels in this kit taken by XLForum member, salmanmr. \\ |
| + | Note: The barrels in this kit were not identical. \\ | ||
| {{:techtalk:ref:engmech:slobber_stopper_dim1_by_salmanmr.jpg?direct&300|}} ((Photo by salmanmr of the XLFORUM http://xlforum.net/forums/showthread.php?p=5906708#post5906708)) {{:techtalk:ref:engmech:slobber_stopper_dim2_by_salmanmr.jpg?direct&300|}} ((Photo by salmanmr of the XLFORUM http://xlforum.net/forums/showthread.php?p=5906708#post5906708)) \\ | {{:techtalk:ref:engmech:slobber_stopper_dim1_by_salmanmr.jpg?direct&300|}} ((Photo by salmanmr of the XLFORUM http://xlforum.net/forums/showthread.php?p=5906708#post5906708)) {{:techtalk:ref:engmech:slobber_stopper_dim2_by_salmanmr.jpg?direct&300|}} ((Photo by salmanmr of the XLFORUM http://xlforum.net/forums/showthread.php?p=5906708#post5906708)) \\ | ||
| Line 101: | Line 107: | ||
| (in order to gain (.015" spec) clearance required and keep the top of the barrel vertical) \\ | (in order to gain (.015" spec) clearance required and keep the top of the barrel vertical) \\ | ||
| Or, you could cut the top of the barrel at the same angle as is the inside of the cover to gain some clearance. \\ | Or, you could cut the top of the barrel at the same angle as is the inside of the cover to gain some clearance. \\ | ||
| + | The angle in the cover is superimposed, angles front to back and side to side so it's difficult to measure. \\ | ||
| + | Just pick the tallest area you think that might touch the cover to take your measurement. \\ | ||
| (another way to keep from having to grind the cover) \\ | (another way to keep from having to grind the cover) \\ | ||
| {{:techtalk:ref:engmech:rocker_box_breather_chamber_pic2_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) \\ | {{:techtalk:ref:engmech:rocker_box_breather_chamber_pic2_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) \\ | ||
| Line 124: | Line 132: | ||
| In fact if you achieve the clearance on the barrel, then install the boxes (with gaskets), that raises the cover with even more clearance from the barrels. \\ | In fact if you achieve the clearance on the barrel, then install the boxes (with gaskets), that raises the cover with even more clearance from the barrels. \\ | ||
| + | |||
| So the only plausible reason for the instructions reading (remove material from cover) would be to get the pieces straight to take the barrel clearance dim. \\ | So the only plausible reason for the instructions reading (remove material from cover) would be to get the pieces straight to take the barrel clearance dim. \\ | ||
| + | And that's due to the angled shelf in the cover. \\ | ||
| You shouldn't need to grind into the cover for that. See "Measure the Barrel to Cover Clearance" above for a better way to get that clearance dim. \\ | You shouldn't need to grind into the cover for that. See "Measure the Barrel to Cover Clearance" above for a better way to get that clearance dim. \\ | ||
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| The kit comes with an 1/8" drill bit to enlarge the drainback hole in the drain pool chamber. But be aware that; \\ | The kit comes with an 1/8" drill bit to enlarge the drainback hole in the drain pool chamber. But be aware that; \\ | ||
| Each motor has different conditions and what works for one may not for another. \\ | Each motor has different conditions and what works for one may not for another. \\ | ||
| - | Drilling that drain hole may allow more crankcase pressure to escape the engine when it's supposed to escape thru the umbrella. \\ | + | Drilling that drain hole may allow more crankcase air/oil mist to escape the engine on downstroke when it's supposed to escape thru the umbrella. \\ |
| - | When the umbrella closes, the only intake of air is that tiny drain. \\ | + | When the umbrella closes (upstroke), the only intake of air is that tiny drain hole. \\ |
| And IF there is not enough oil in that cavity to drain back, it may allow too much atmosphere to come back into the motor. \\ | And IF there is not enough oil in that cavity to drain back, it may allow too much atmosphere to come back into the motor. \\ | ||
| Added air intake may promote wet sumping. So make sure not to wobble the hole any larger than the bit. \\ | Added air intake may promote wet sumping. So make sure not to wobble the hole any larger than the bit. \\ | ||
| It may be a trial and error thing and if you do one mod at a time, you'll know more about what worked and what didn't. \\ | It may be a trial and error thing and if you do one mod at a time, you'll know more about what worked and what didn't. \\ | ||
| + | The engine is designed to have a slight vacuum in the breathing system on the inside of the motor. \\ | ||
| + | On upstroke, the vacuum pulls oil down to the boxes thru that drain hole. It's too small for gravity to flow oil. \\ | ||
| + | Enlarging the hole, especially too much, will allow vacuum to drain the oil faster, which gives more time to suck in air before piston direction changes again. \\ | ||
| You could first try and chamfer the umbrella hole to 60º (included angle) countersink bit and not drill out the drainback hole. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?page=5&t=1958462)) \\ | You could first try and chamfer the umbrella hole to 60º (included angle) countersink bit and not drill out the drainback hole. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?page=5&t=1958462)) \\ | ||
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| So it goes out the big hole on top, thru the breather bolts and out. The threaded insert just provides a lip around the hole. \\ | So it goes out the big hole on top, thru the breather bolts and out. The threaded insert just provides a lip around the hole. \\ | ||
| So any oil that drops out of suspension around the air hole won't drain out the breather. It just makes it a little bit harder for oil to go out the breather. \\ | So any oil that drops out of suspension around the air hole won't drain out the breather. It just makes it a little bit harder for oil to go out the breather. \\ | ||
| + | |||
| + | ===== Install the Rocker Boxes ===== | ||
| + | Before installing the rocker boxes back on the motor, make sure they are clean from all dirt, debris, shavings etc. \\ | ||
| + | It won't hurt to spray them down with carb cleaner etc. before installing the umbrellas. The instructions say to install new umbrellas anyway. \\ | ||
| + | Make sure both the umbrellas and their now counterpart Slobber Stoppers goes on the intake side on each cylinder. \\ | ||
| + | Visually inspect that either gasket does not pinch or pooch out after you tighten up the cover bolts. \\ | ||
| + | If so, loosen or remove the cover and tighten them again or it'll leak oil. \\ | ||
| + | **Cover bolt torque is 10-13 in-lbs** (FSM says ft-lbs but this is wrong). \\ | ||
| + | OEM cover bolts have a washer pressed onto the bolt with a corresponding fiber washer added for each bolt. \\ | ||
| + | Some aftermarket kits have the fiber washers and copper washers. Use either / or but not both types of washers together. \\ | ||
| + | If reusing fiber washers, (not recommended), check them to make sure the fiber hasn't already began imploding. If so, do not use the offending washers. \\ | ||
| + | Vacuum from the rocker box area will eventually implode the fiber washers (looks like an O-ring around the threads and the washer OD is smaller than new ones). \\ | ||
| + | If there are any air leaks around the cover bolts, even with the Slobber Stoppers added, you may still get oil out the breather vent(s). \\ | ||
| + | |||
| + | | ||
| \\ | \\ | ||
