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techtalk:ih:oil03 [2024/05/07 01:20] hippysmack [Oil Pump - Complete Unit Part Numbers] |
techtalk:ih:oil03 [2024/05/07 01:58] (current) hippysmack [1977-1985] |
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| ====== Oil Pump - Complete Unit Part Numbers ====== | ====== Oil Pump - Complete Unit Part Numbers ====== | ||
| ===== 1977-1985 ===== | ===== 1977-1985 ===== | ||
| - | * There were 2 different styles of oil pumps used on Sportsters from 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. \\ |
| - | - **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. | + | [[techtalk:ih:oil03d|Click Here]] to see a break down of all the 77-85 pump changes per year. \\ |
| - | - 1977-1981 (26204-75) | + | Factory 1977-E1983 style pumps should all have interchangeable internals. \\ |
| - | - 1982 only (26204-82) | + | Factory L1983-1985 gerotors WILL NOT work in 1977-E1983 pump bodies or covers. \\ |
| - | - E1983 only (26204-82A) | + | Any of the these may be found at swap meets or online. \\ |
| - | - **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. | + | The only mounting difference being that you might have to change out or work around the fittings. \\ |
| - | - L1983-1985 (26197-83) | + | 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. \\ | ||
| - | There were 3 part number changes for the body and cover set. \\ (with unknown casting changes) \\ | ||
| - | * 77-81: (26484-75) Oil pump body, (26486-75) Pump cover | + | - **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. |
| - | * 82-E83: (26484-83) Oil pump body, (26486-83) Pump cover | + | - __1977-1981__ (26204-75) full assembly. |
| - | * L83-85 (26484-75A) Oil pump body, (26486-75A) Pump cover | + | * (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. | ||
| - | The L83-85 style pump will bolt to any 77-85 engine as it's own assembly. \\ | + | There were 3 part number changes for the __body and cover set__. \\ (with unknown casting changes) \\ |
| - | The 77-E83 style pumps should all have interchangeable internals. \\ | + | |
| - | Any of the these may be found at swap meets or online. \\ | + | * 1977-1981: (26484-75) Oil pump body, (26486-75) Pump cover |
| - | The only mounting difference being that you might have to change out or work around the fittings. \\ | + | * 1982-E1983: (26484-83) Oil pump body, (26486-83) Pump cover |
| - | 45° and 90° fittings were changed in some of the different year model pumps. \\ | + | * L1983-1985 (26484-75A) Oil pump body, (26486-75A) Pump cover |
| - | * 77-81 style oil pump, (1) 90° return and (1) 45° feed fitting. | ||
| - | * 82-E83 style oil pump, (1) 45° return and (1) 45° feed fitting. | ||
| - | * L83-85 style oil pump, (1) 90° return and (1) 90° feed fitting. | ||
| - | 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. | ||
| - | * 77-E83 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). \\ | ||
| - | **Outer Plate**: \\ | ||
| - | 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 77-85 pumps. \\ | ||
| ====== Oil Pump Function ====== | ====== Oil Pump Function ====== | ||
