Differences

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--- techtalk:ih:oil03a [2018/12/23 02:13]
hippysmack [L83-85]
+++ techtalk:ih:oil03a [2021/09/19 23:44]
hippysmack [Late 1983 oil pump assembly design modification]
@@ Line 29: / Line 29: @@
 ===== Oil Pump Body =====
+==== 77-E83 ====
 |{{:techtalk:ih:oil:77-85_oil_pump_body_9_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_body_10_by_hippysmack.jpg?direct&300|}}|
@@ Line 36: / Line 37: @@
 |{{:techtalk:ih:oil:77-85_oil_pump_body_5_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_body_6_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_body_7_by_hippysmack.jpg?direct&300|}}|
+==== L83-85 ====
+|  Late 83-85 pump body ((photo by marklocklear of the XLFORUM http://xlforum.net/forums/showthread.php?p=5729472#post5729472))  |
+|{{:techtalk:ih:oil:l83_pump_body_by_marklocklear.jpg?direct&300|}}|
 ===== Oil Pump Cover =====
+==== 77-E83 ====
 |{{:techtalk:ih:oil:77-85_oil_pump_cover_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_cover_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_cover_3_by_hippysmack.jpg?direct&300|}}|
 |{{:techtalk:ih:oil:77-85_oil_pump_cover_4_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_cover_5_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_cover_6_by_hippysmack.jpg?direct&300|}}|
+==== L83-85 ====
+|Late 83-85 pumpcover ((photo by marklocklear of the XLFORUM http://xlforum.net/forums/showthread.php?p=5729472#post5729472))|
+|{{:techtalk:ih:oil:l83_pump_cover_marklocklear.jpg?direct&300|}}|
 ====== Gearshaft ======
 See also [[techtalk:ih:oil03b#gear_shaft_dims|Gear Shaft Dims]]. \\
@@ Line 56: / Line 68: @@
 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 also sets the lowest position for the plate and return gerotors inside the pump. \\
+It also sets the lowest position for the inner plate and return gerotors inside the pump. \\
 |{{:techtalk:ih:oil:77-85_oil_pump_gear_shaft_retaining_ring_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_retaining_ring_location_by_hippysmack.jpg?direct&300|}}|
@@ Line 69: / Line 81: @@
 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. \\
 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. \\
-If the pin holding the gearshaft is too short, it can get between the gearshaft and the housing bore. \\
+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. \\
+This could induce slop in the plate and allow it to try to spin the plate against the roll pin in the body. \\
 |{{:techtalk:ih:oil:77-85_oil_pump_gear_shaft_pins_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_gear_shaft_pins_3_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_gearshaft_pin_location_5_by_hippysmack.jpg?direct&300|}}|
@@ Line 86: / Line 102: @@
 ====== Separator Plates ======
 The 77-90 oil pumps used two plates to separate the feed and scavenge gerotors. \\
-Both plates sit between the feed and return gears. \\
+Both plates sit between the feed and return gears and remain stationary during operation. \\
 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. \\
@@ Line 140: / Line 156: @@
     * It is pressed into the outer plate hole to seal around the driveshaft.
-|{{:techtalk:ih:oil:12036_outer_plate_seal-_by_dirtycory.jpg?direct&300|}}|{{:techtalk:ih:oil:12036a_outer_plate_seal-_by_dirtycory.jpg?direct&300|}}|
-|  (12036) 77-82 Outer plate seal. ((photo by DirtyCory of the XLFORUM http://xlforum.net/forums/showthread.php?t=2071153))  |  (12036A) 83-85 Outer plate seal. ((photo by DirtyCory of the XLFORUM http://xlforum.net/forums/showthread.php?t=2071153))  |
+|{{:techtalk:ih:oil:77-85_outer_plate_seals_2_by_nhps.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_outer_plate_seals_3_by_nhps.jpg?direct&300|}}|{{:techtalk:ih:oil:12036_and_12036a_outer_plate_seals.jpg?direct&300|}}|
+|  (12036) 77-82 Outer plate seal. (12036A) 83-85 Outer plate seal. ((photos by NHPS of the XLFORUM http://xlforum.net/forums/showthread.php?t=2072076))  ||  12036 and 12036A comparison ((photo by Hippysmack))  |
 |{{:techtalk:ih:oil:outer_seal_installed_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:83-90_oil_pump_outer_plate_seal_4_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_disassembly_3_by_hippysmack.jpg?direct&300|}}|
@@ Line 197: / Line 214: @@
   * These modifications limit interchangeability and affect the installation of repair parts:
     * Either early style or late style gerotor gears may be used with late style (under-cut) oil pump bodies and covers.
-    * Only early style chamfered gerotor gears may 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).
+    * Only early style chamfered gerotor gears may 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). \\ When non-chamfered gear sets are used, the pump body or cover must be changed.
 |{{:techtalk:ih:oil:77-e83_outside_gerotor_edge_by_dirtycory.jpg?direct&200|}}|{{:techtalk:ih:oil:l83-85_outside_gerotor_edge_by_dirtycory.jpg?direct&200|}}|
@@ Line 224: / Line 241: @@
 |{{:techtalk:ih:oil:77-e83_return_gerotors_installed_position_by_hippysmack.jpg?direct&300|}}|
 |  77-E83 return gerotors  installed position ((photo by Hippysmack))  |
+===== L83-90 =====
+(26491-83) Straight cut return gerotors: \\
+|{{:techtalk:evo:oil:l83-90_oil_pump_return_gerotors_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:l83-90_oil_pump_return_gerotors_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:l83-90_oil_pump_return_gerotors_4_by_hippysmack.jpg?direct&300|}}|
+|  L83-90 return gerotors (26491-83) ((photos by Hippysmack))  |||
 ====== Check Valve ======
@@ Line 275: / Line 298: @@
 ====== Oil Pressure Switch ======
 See also; \\
-[[techtalk:ref:trouble07|Tesing the Oil Pressure Switch]] \\
+[[techtalk:ref:svcproc30|Tesing the Oil Pressure Switch]] \\
 [[techtalk:ih:oil01#oil_pressure_switch|More on How the Ironhead Oil Pressure Switch Works]] \\

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