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| techtalk:ih:oil01u [2020/09/15 01:12] – [Plugging the Valve / Hole] hippysmack | techtalk:ih:oil01u [2023/12/31 20:42] (current) – hippysmack | ||
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| ====== Plugging the Valve / Hole ====== | ====== Plugging the Valve / Hole ====== | ||
| **Note**: If you plug the transfer valve, it is advisable to also add a transmission / primary vent as well. \\ | **Note**: If you plug the transfer valve, it is advisable to also add a transmission / primary vent as well. \\ | ||
| - | The transfer valve also vents the primary compartment | + | The transfer valve has a dual function of moving out excess oil leakage from sit sumping and venting |
| + | (where the air is expelled along with crankcase pressure | ||
| Without a vent once the transfer valve is plugged off, primary venting is severely hindered if not bottled up entirely. \\ | Without a vent once the transfer valve is plugged off, primary venting is severely hindered if not bottled up entirely. \\ | ||
| - | It is possible to blow the sprocket seal without a vent to atmosphere over the primary or tranny. \\ | + | It is possible to blow the sprocket seal, starter gasket or primary gasket |
| - | When plugging the transfer valve; \\ | ||
| - | With the dual function of moving excess oil leakage from sit sumping and venting primary compartment air, consensus says to also install a primary vent as well. \\ | ||
| See Venting the Primary below. \\ | See Venting the Primary below. \\ | ||
| Line 24: | Line 23: | ||
| * Epoxy the valve. | * Epoxy the valve. | ||
| - | * Using JB Weld to plug the hole in the transfer valve has been done by many with good results. \\ However, the valve needs to be cleaned of all oil and debris first or it can lose it's adherence, travel, and find it's way into the crankcase. \\ It's best to remove the transfer valve before plugging it so you don't accidently get anything in the crankcase. \\ The valve can be removed with a square drive pipe plug that sits flush with left hand crankcase side. ((buster of the XLFORUM | + | * Using JB Weld to plug the hole in the transfer valve has been done by many with good results. \\ However, the valve needs to be cleaned of all oil and debris first or it can lose it's adherence, travel, and find it's way into the crankcase. \\ It's best to remove the transfer valve before plugging it so you don't accidently get anything in the crankcase. \\ The valve can be removed with a square drive pipe plug that sits flush with left hand crankcase side. ((buster of the XLFORUM |
| * Weld the hole in the valve. | * Weld the hole in the valve. | ||
| - | * If you can access a welder, you can weld the hole in the valve shut (removed first). ((Ivan RoachCoach of the XLFORUM | + | * If you can access a welder, you can weld the hole in the valve shut (removed first). ((Ivan RoachCoach of the XLFORUM |
| * Plug the valve. | * Plug the valve. | ||
| - | * You can drill & tap the hole in the valve to accept either an #8-32 or #10-32 soft brass screw and thread that screw in there all slathered in red Loctite. \\ Once it's in there, distort the screw' | + | * You can drill & tap the hole in the valve to accept either an #8-32 or #10-32 soft brass screw and thread that screw in there all slathered in red Loctite. \\ Once it's in there, distort the screw' |
| * Plug the case. | * Plug the case. | ||
| - | * HD made a plug (24571-72r) for the transfer hole used on XR-750. ((Dr Dick of the XLFORUM | + | * HD made a plug (24571-72r) for the transfer hole used on XR-750. ((Dr Dick of the XLFORUM |
| * You can remove the transfer valve and make a dummy threaded plug to replace it. The threads are 3/ | * You can remove the transfer valve and make a dummy threaded plug to replace it. The threads are 3/ | ||
| * You could split the cases, remove / discard the transfer valve and drill and tap the hole for a bolt. | * You could split the cases, remove / discard the transfer valve and drill and tap the hole for a bolt. | ||
| - | | The transfer below valve below was packed with JB Weld to negate it's operation. ((photos by Jtrapass of the XLFORUM | + | | The transfer below valve below was packed with JB Weld to negate it's operation. ((photos by Jtrapass of the XLFORUM |
| - | |{{: | + | |{{: |
| ====== Venting the Primary ====== | ====== Venting the Primary ====== | ||
| - | |||
| With the transfer valve plugged, the primary can't breath as it can with the transfer valve functioning. \\ | With the transfer valve plugged, the primary can't breath as it can with the transfer valve functioning. \\ | ||
| That air path would now be blocked. \\ | That air path would now be blocked. \\ | ||
| - | Technically, | + | Technically, |
| - | That can also act as a vent as air can enter and escape there (the part where the actual cable goes into the threaded piece that screws into the clutch cable hole). ((Buck101 of the XLFORUM | + | That can also act as a vent as air can enter and escape there (the part where the actual cable goes into the threaded piece that screws into the clutch cable hole). ((Buck101 of the XLFORUM |
| There is slack (slop) where the cable end is pressure fitted ( by slack adjustment of cable) into the threaded piece. \\ | There is slack (slop) where the cable end is pressure fitted ( by slack adjustment of cable) into the threaded piece. \\ | ||
| There is air space open along the cables path through the threaded piece also. \\ | There is air space open along the cables path through the threaded piece also. \\ | ||
| Line 50: | Line 48: | ||
| **Installing a dedicated primary vent**: \\ | **Installing a dedicated primary vent**: \\ | ||
| - | * **You can drill a tiny hole in the primary access plug if yours doesn' | + | * **You'd think you could use the hole in the primary access plug as a vent**. |
| - | * **You can use the 77-up venting location on 70-76 engines**: | + | * However, any non-tin cover bike with a blocked transfer will piss out the vent of the primary filler plug. ((Dr Dick of the XLFORUM https:// |
| + | * The primary filler plug part numbers are (34742-52A) for 54-70 and (34742-71) for 71 to 76. (Fridge of the XLFORUM https:// | ||
| + | * **You can use the 77-80 venting location on 70-76 engines**: | ||
| * You can install a vent plug (like the 34744-77 tranny vent) through one of the holes on top of the cases, just in front of the rear engine mount bracket. | * You can install a vent plug (like the 34744-77 tranny vent) through one of the holes on top of the cases, just in front of the rear engine mount bracket. | ||
| - | * Those two bolt holes are used for the oil tank bracket (xlch model) or battery carrier bracket (xlh model). ((JBM of the XLFORUM | + | * Those two bolt holes are used for the oil tank bracket (xlch model) or battery carrier bracket (xlh model). ((JBM of the XLFORUM |
| * Short frame cases use 4 bolts and 3 studs to hold rear mount to cases. | * Short frame cases use 4 bolts and 3 studs to hold rear mount to cases. | ||
| - | * Long frame cases use 2 bolts and 3 studs. ((Dr Dick of the XLFORUM | + | * Long frame cases use 2 bolts and 3 studs. ((Dr Dick of the XLFORUM |
| * The bolt goes in the hole closest to case parting seam. \\ Conversely, installing the vent bolt in any of the four short frame rear mount bolt holes usually results in drips from the vent. | * The bolt goes in the hole closest to case parting seam. \\ Conversely, installing the vent bolt in any of the four short frame rear mount bolt holes usually results in drips from the vent. | ||
| * However, if you use a longer hose, loop it up around the seat post and back down (as 2003-earlier Evos did), it shouldn' | * However, if you use a longer hose, loop it up around the seat post and back down (as 2003-earlier Evos did), it shouldn' | ||
| * **You can tap a vent above the primary on 57-69 engines**: | * **You can tap a vent above the primary on 57-69 engines**: | ||
| - | * You can drill and tap a hole at the top of the case on the primary side and tee into the vent line going to the oil tank. ((simeli of the XLFORUM | + | * You can drill and tap a hole at the top of the case on the primary side and tee into the vent line going to the oil tank. ((simeli of the XLFORUM |
| The vent below was made with a bolt with a hole drilled through the center of it. That hole was counter-bored 7/32" on top and tapped 1/ | The vent below was made with a bolt with a hole drilled through the center of it. That hole was counter-bored 7/32" on top and tapped 1/ | ||
| Line 66: | Line 65: | ||
| A small hose was slid over the bleeder screw routed down. \\ | A small hose was slid over the bleeder screw routed down. \\ | ||
| - | {{: | + | {{: |
| + | 1977-1980 models use a fitting (34744-77) with a SAE 3/8" x 16 (x app. 7/16") bolt pattern that has a 1/4" hose nipple on the other end. \\ | ||
| + | {{: | ||
