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techtalk:evo:oil03i [2018/12/23 14:37] hippysmack [Gearshaft Pins] |
techtalk:evo:oil03i [2018/12/24 01:24] hippysmack [86-90 Oil Pump (26204-86) Individual Parts and Pics] |
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====== EVO: Oiling & Lubrication - Sub-03I ====== | ====== EVO: Oiling & Lubrication - Sub-03I ====== | ||
====== 86-90 Oil Pump (26204-86) Individual Parts and Pics ====== | ====== 86-90 Oil Pump (26204-86) Individual Parts and Pics ====== | ||
+ | See also See also [[techtalk:evo:oil03j|86-90 Oil Pump (26204-86) Individual Parts and Pics]]|86-90 Oil Pump (26204-86) Parts (approximate) Dims]] | ||
====== Oil Pump Body and Cover ====== | ====== Oil Pump Body and Cover ====== | ||
===== Oil Pump Body ===== | ===== Oil Pump Body ===== | ||
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|{{:techtalk:evo:oil:86-90_oil_pump_cover_4_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_cover_5_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_cover_6_by_hippysmack.jpg?direct&300|}}| | |{{:techtalk:evo:oil:86-90_oil_pump_cover_4_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_cover_5_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_cover_6_by_hippysmack.jpg?direct&300|}}| | ||
- | ===== Gearshaft ===== | + | ====== Gearshaft ====== |
The gear shaft part number (26488-75) was used from 77-90. \\ | The gear shaft part number (26488-75) was used from 77-90. \\ | ||
+ | The gear has 20 teeth. \\ | ||
The gear dims and teeth pitch are all the same nominally from 77 to present oil pumps. \\ | The gear dims and teeth pitch are all the same nominally from 77 to present oil pumps. \\ | ||
However, there are variations of the exact length of the shaft. \\ | However, there are variations of the exact length of the shaft. \\ | ||
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|{{:techtalk:evo:oil:86-90_oil_pump_gearshaft_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_gearshaft_2_by_hippysmack.jpg?direct&300|}}| | |{{:techtalk:evo:oil:86-90_oil_pump_gearshaft_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_gearshaft_2_by_hippysmack.jpg?direct&300|}}| | ||
- | ===== Gearshaft Retaining Ring ===== | + | ====== Gearshaft Retaining Ring ====== |
Gear shaft retaining ring (26497-75) was used on 77-90 model oil pumps. \\ | Gear shaft retaining ring (26497-75) was used on 77-90 model oil pumps. \\ | ||
It keeps the inner plate, return gerotors and gearshaft locked in the pump. \\ | It keeps the inner plate, return gerotors and gearshaft locked in the pump. \\ | ||
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|{{:techtalk:evo:oil:86-90_oil_pump_gearshaft_retaining_ring_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_gearshaft_retaining_ring_2_by_hippysmack.jpg?direct&300|}}| | |{{:techtalk:evo:oil:86-90_oil_pump_gearshaft_retaining_ring_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_gearshaft_retaining_ring_2_by_hippysmack.jpg?direct&300|}}| | ||
- | ===== Gearshaft Pins ===== | + | ====== Gearshaft Pins ====== |
The gear shaft solid pin (26430-76), was used in 77-90 oil pumps. \\ | The gear shaft solid pin (26430-76), was used in 77-90 oil pumps. \\ | ||
The diameter and lengths of the pins vary. \\ | The diameter and lengths of the pins vary. \\ | ||
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So, the exact length shouldn't be an issue for the gerotors. \\ | So, the exact length shouldn't be an issue for the gerotors. \\ | ||
- | The installed lower pin also holds the outer plate in the pump body. \\ | + | The installed upper pin holds the gearshaft in the pump body during disassembly. \\ |
- | + | The length of this pin shouldn't be an issue for the gearshaft. \\ | |
- | The installed upper pin holds the gearshaft in the pump body. \\ | + | The retaining ring and return gears set the upper positioning of this pin inside the pump. \\ |
- | The length of this pin can be an issue. \\ | + | |
- | Too short and it won't keep the gearshaft in the pump. \\ | + | |
There is a clearance between the pump bore and the gearshaft. \\ | There is a clearance between the pump bore and the gearshaft. \\ | ||
The upper gearshaft bushing does reach to the end of it's bore in the housing where the pin resides. \\ | The upper gearshaft bushing does reach to the end of it's bore in the housing where the pin resides. \\ | ||
So, there is extra clearance between the gearshaft and pump housing bore. \\ | So, there is extra clearance between the gearshaft and pump housing bore. \\ | ||
- | After the retaining ring comes out, the shaft can drop into this tapered bore clearance and the pin can scratch the aluminum sides. \\ | + | After the retaining ring comes out, the shaft can drop into this tapered bore clearance and the lower pin can scratch the aluminum sides. \\ |
+ | |||
+ | The installed lower pin also holds the outer plate in the pump body. \\ | ||
+ | The length of this pin could be a potential issue under the right conditions. \\ | ||
+ | Too short and it could get make it's way into the hole in the plate and tear the seal. \\ | ||
+ | This could induce slop in the plate and allow it to try to spin the plate against the roll pin in the body. \\ | ||
+ | As well as create a leak from the feed side and allow oil to float up into the engine thru the gearshaft bore. \\ | ||
|{{:techtalk:evo:oil:86-90_oil_pump_gearshaft_pins_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_gearshaft_pins_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_gearshaft_pins_3_by_hippysmack.jpg?direct&300|}}| | |{{:techtalk:evo:oil:86-90_oil_pump_gearshaft_pins_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_gearshaft_pins_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_gearshaft_pins_3_by_hippysmack.jpg?direct&300|}}| | ||
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The plates are separated by a spring washer that puts tension against each plate in opposite directions. \\ | The plates are separated by a spring washer that puts tension against each plate in opposite directions. \\ | ||
Thus sealing off the feed and scavenge sections. \\ | Thus sealing off the feed and scavenge sections. \\ | ||
- | |{{:techtalk:evo:oil:86-90_oil_pump_separator_plates.jpg?direct&300|}}| | + | |{{:techtalk:evo:oil:86-90_oil_pump_separator_plates_by_hippysmack.jpg?direct&300|}}| |
| Separator plate locations ((photo by Hippysmack)) | | | Separator plate locations ((photo by Hippysmack)) | | ||
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| Spring washer (26461-77) ((photos by Hippysmack)) || | | Spring washer (26461-77) ((photos by Hippysmack)) || | ||
- | |{{:techtalk:evo:oil:86-90_oil_pump_separator_plates.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_disassembly_6_by_hippysmack.jpg?direct&300|}}| | + | |{{:techtalk:evo:oil:86-90_oil_pump_separator_plates_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_disassembly_6_by_hippysmack.jpg?direct&300|}}| |
| Spring washer location between the plates ((photo by Hippysmack)) |Spring washer fits inside and faces the inner plate. ((photo by Hippysmack))| | | Spring washer location between the plates ((photo by Hippysmack)) |Spring washer fits inside and faces the inner plate. ((photo by Hippysmack))| | ||