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techtalk:ih:oil03 [2024/05/03 19:24] hippysmack [Oil Pump Volume (1957-1985)] |
techtalk:ih:oil03 [2024/05/07 01:58] (current) hippysmack [1977-1985] |
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| * [[techtalk:ih:oil03u|XR-750 Oil Pump - Individual Parts and Pics]] | * [[techtalk:ih:oil03u|XR-750 Oil Pump - Individual Parts and Pics]] | ||
| - | ====== Oil Pump Function ====== | + | ====== Oil Pump Fittings and Oil Paths ====== |
| + | [[techtalk:ih:oil04|Click Here]] to reference the Oil Tank, Lines and Routing page in the Sportsterpedia. | ||
| + | * **1977-1985 oil pumps** feed oil to the motor from the top side of the pump. \\ Feed oil goes from oil tank to the lower gerotors and out a hole in the top front of the pump to the cam cover passages. \\ A drilled hole in the lower front intercepts the feed path to affect the oil sending unit in the front of the pump. \\ Return oil drops into the "duck bill" on the back of the pump, to the upper gerotors to the top front fitting, to the tank. | ||
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| + | {{:techtalk:ih:oil:77-85_oil_pump_oiling_paths_by_ironheadjunkie.jpg?direct&300|}} ((photo by ironheadjunkie of the XLFORUM, labeled by Hippysmack)) \\ | ||
| + | |||
| + | ====== Oil Pump - Complete Unit Part Numbers ====== | ||
| + | ===== 1977-1985 ===== | ||
| + | There were 2 different styles of oil pumps used on Sportsters from 1977-1985: All year georotor pumps will bolt to any 1977-1985 motor. \\ | ||
| + | [[techtalk:ih:oil03d|Click Here]] to see a break down of all the 77-85 pump changes per year. \\ | ||
| + | Factory 1977-E1983 style pumps should all have interchangeable internals. \\ | ||
| + | Factory L1983-1985 gerotors WILL NOT work in 1977-E1983 pump bodies or covers. \\ | ||
| + | Any of the these may be found at swap meets or online. \\ | ||
| + | The only mounting difference being that you might have to change out or work around the fittings. \\ | ||
| + | 45° and 90° fittings were changed in some of the different year model pumps. \\ | ||
| + | Most parts will interchange between the different pumps with the exception of; \\ | ||
| + | |||
| + | Gerotors: \\ | ||
| + | Either early or late style gerotor gears may be used with late style (under-cut) oil pump bodies and covers. \\ | ||
| + | 1977-E1983 style chamfered gerotor gears may (only) be used with early style oil pump bodies and covers. \\ | ||
| + | __Use of late style gerotor gears in early style oil pump bodies and covers could cause the oil pump to bind up and possible pump failure to follow__. \\ | ||
| + | |||
| + | Outer Divider Plate and oil seal: (2 plates, inner and outer, divide the feed and return cavities) \\ | ||
| + | The outer plate had a design change at the bore for the gearshaft. The outer plate seal changed to mate up with the new design. \\ | ||
| + | So, they fit together as a unit. Either plate matched with it's correct seal will work on all 1977-1985 oil pumps. \\ | ||
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| + | - **1977-E1983** (5 different versions of upgrades / changes from 77-E83) \\ USE ONLY (77-E83) Chamfered OD Gerotors In These Pumps. There were 3 different assemblies of these pumps. | ||
| + | - __1977-1981__ (26204-75) full assembly. | ||
| + | * (1) 90° return fittng and (1) 45° feed fitting. | ||
| + | - __1982 only__ (26204-82) full assembly. | ||
| + | * (1) 45° return and (1) 45° feed fitting. | ||
| + | - E1983 only (26204-82A) full assembly. | ||
| + | * (1) 45° return and (1) 45° feed fitting. | ||
| + | - **L1983-1985** (upgraded oil pump was suggested as a replacement for all year models 1977-1985) \\ Either chamfered or straight cut OD gerotors can be used in these pumps. There was only 1 assembly of this pump and the gerotors were not sold separately. \\ You had to buy the full pump assembly to get the straight cut gerotors within. | ||
| + | - __L1983-1985__ (26197-83) full assembly. | ||
| + | * (1) 90° return and (1) 90° feed fitting. | ||
| + | |||
| + | There were 3 part number changes for the __body and cover set__. \\ (with unknown casting changes) \\ | ||
| + | |||
| + | * 1977-1981: (26484-75) Oil pump body, (26486-75) Pump cover | ||
| + | * 1982-E1983: (26484-83) Oil pump body, (26486-83) Pump cover | ||
| + | * L1983-1985 (26484-75A) Oil pump body, (26486-75A) Pump cover | ||
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| + | ====== Oil Pump Function ====== | ||
| The oil pump is a positive displacement unit. \\ | The oil pump is a positive displacement unit. \\ | ||
| If you block the discharge flow path, discharge pressure will rise and literally approaches infinity until something fails. ((BuckIRyder of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/90285-external-oil-filter-micron-age/page2?t=730325&page=2)) \\ | If you block the discharge flow path, discharge pressure will rise and literally approaches infinity until something fails. ((BuckIRyder of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/90285-external-oil-filter-micron-age/page2?t=730325&page=2)) \\ | ||
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| Oil pressure has a direct relationship with oil flow rate. \\ | Oil pressure has a direct relationship with oil flow rate. \\ | ||
| + | Oil pressure also changes throughout the feed path. The most pressure will always be at the oil pump. \\ | ||
| + | Oil pressure is reduced as oil travels though the restrictions in the engine. \\ | ||
| The manuals state the oil pump will deliver it's entire content under pressure. \\ | The manuals state the oil pump will deliver it's entire content under pressure. \\ | ||
| And that is true, with exception. The oil pressure under normal riding conditions is generally low. \\ | And that is true, with exception. The oil pressure under normal riding conditions is generally low. \\ | ||
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| If oil can't get thru outlets as fast as pump is pushing the oil, pressure rises on the incoming side of outlets. \\ | If oil can't get thru outlets as fast as pump is pushing the oil, pressure rises on the incoming side of outlets. \\ | ||
| Faster flow thru the outlets = less pressure in the feed path, slower flow thru the feed paths = more pressure in the feed path. \\ | Faster flow thru the outlets = less pressure in the feed path, slower flow thru the feed paths = more pressure in the feed path. \\ | ||
| - | This is why pressure is always highest on cold startup and pressure falls as he oil heats up. \\ | + | This is why pressure is always highest on cold startup and pressure falls as the oil heats up. \\ |
| + | Colder oil is thicker and more resistant to flow. Hotter oil is thinner less resistant to flow. \\ | ||
| - | ====== Oil Pump Fittings and Oil Paths ====== | ||
| - | [[techtalk:ih:oil04|Click Here]] to reference the Oil Tank, Lines and Routing page in the Sportsterpedia. | ||
| - | |||
| - | * **1977-1985 oil pumps** feed oil to the motor from the top side of the pump. \\ Feed oil goes from oil tank to the lower gerotors and out a hole in the top front of the pump to the cam cover passages. \\ A drilled hole in the lower front intercepts the feed path to affect the oil sending unit in the front of the pump. \\ Return oil drops into the "duck bill" on the back of the pump, to the upper gerotors to the top front fitting, to the tank. | ||
| - | |||
| - | {{:techtalk:ih:oil:77-85_oil_pump_oiling_paths_by_ironheadjunkie.jpg?direct&300|}} ((photo by ironheadjunkie of the XLFORUM, labeled by Hippysmack)) \\ | ||
| ====== Oil Pump Gaskets/Seals ====== | ====== Oil Pump Gaskets/Seals ====== | ||
