Differences

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--- techtalk:ih:oil03 [2023/12/31 21:19]
hippysmack
+++ techtalk:ih:oil03 [2024/05/07 01:58]
hippysmack [1977-1985]
@@ Line 20: / Line 20: @@
     * [[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.
+{{: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. \\
+° 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. \\
+-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. \\
+    - **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
+====== Oil Pump Function ======
 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)) \\
@@ Line 64: / Line 113: @@
 (running at 4,000 RPM, the oil pump is turning at 2,000 RPM) \\
-====== Oil Pump Pressure (57-85) ======
+====== Oil Pump Pressure (1957-1985) ======
 See also [[techtalk:ref:oil15|Installing an Oil Pressure Gauge]] in the REF section of the Sportsterpedia. \\
@@ Line 93: / Line 142: @@
 {{:techtalk:ih:oil:oil_pressure_gauge_1_by_dieselox4.jpg?direct&300|}} ((photo by Dieselox4 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/134952-where-how-to-mount-custom-oil-pressure-gauge?t=1456449)) {{:techtalk:ih:oil:oil_pressure_gauge_2_by_dieselox4.jpg?direct&300|}} ((photo by Dieselox4 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/134952-where-how-to-mount-custom-oil-pressure-gauge?t=1456449))
-===== Oil Pump Fittings and Oil Paths =====
+====== Oil Pump Volume (1957-1985) ======
-[[techtalk:ih:oil04|Click Here]] to reference the Oil Tank, Lines and Routing page in the Sportsterpedia.
+It is not stated in the manuals how much oil these pumps will deliver. \\
+However, testing has been done to find out the flow rates for the (feed side only) on the -72 gear pump. \\
+Testing has also been done on (both feed and return sides) on 1977-up gerotor pumps. \\
+See the links below for those articles in the Sportsterpedia. \\
+  *  [[techtalk:ref:oil24#measuring_feed_oil_volume_flow_rate_of_the_-72_gear_type_oil_pump|Measuring Feed Oil Volume (flow rate) of the -72 Gear Type Oil Pump]] Includes testing and result summaries.
+  *  [[techtalk:ref:oil22#measuring_output_volume_flow_rate_of_a_gerotor_oil_pump|Measuring Output Volume (flow rate) of a Gerotor Oil Pump]]: Measuring by flow rate by cc'ing gerotors as well as bench testing in real time.
+    * [[techtalk:ref:oil22p|Charted result summaries from cc'ing the gerotors]].
-  * **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.
+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. \\
+And that is true, with exception. The oil pressure under normal riding conditions is generally low. \\
+As RPM goes up, the oil flow goes up and the pressure in the feed path goes up. \\
+As RPM goes down, the oil flow goes down and the pressure in the feed path goes down. \\
+The caveat is the outlet sizes (restrictions) in the oil feed path. The outlets are very small orifices (crankpin and rockers). \\
+As RPM goes up, flow increases and the outlets get flooded with more oil pushing thru them. \\
+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. \\
+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. \\
-{{: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 ======
@@ Line 120: / Line 187: @@
 |1977-1982 Sportster|12036|Outer divider plate oil seal (between divider plates). \\ Use only with outer plate 26493-75|{{ :techtalk:ih:oil:1977-1982_sportster_oil_pump_shaft_seal_12036_by_57harleyrider_pic3.jpg?linkonly |Pic}} ((photos courtesy of Ebay seller, 57harleyrider. [[https://www.ebay.com/str/57harleyrider|Link to Ebay Store]] ))|
 |1983-1990 Sportster|12036A|Shaft oil seal between divider plates. \\ Use only with outer plate 26493-75A|{{ :techtalk:ih:oil:1983-1990_sportster_oil_pump_shaft_seal_12036a_by_boneyard_cycles.jpg?linkonly |Pic}} ((photos courtesy of Boneyard Cycles in Melbourne, FL))|
+====== Internal leaks ======
+Generally, oil will leak into the motor on shutdown (especially on extended shutdown periods). \\
+For more information on that, [[techtalk:ref:oil10|Click Here]] to view "Sit Sumping" in the REF section of the Sportsterpedia. \\
+Below is concerning an issue with gaskets or seals where either oil / air or both leak into the motor while riding. \\
+{{:techtalk:ih:oil:1977-up_sportster_oil_pump_internal_gasket_leak_by_hippysmack.gif?direct|}}
 ====== Priming the Oil Pump ======
@@ Line 132: / Line 207: @@
     * You can also using a large syringe with a tapered tip inserted into the oil supply hose on the bottom of the oil tank. ((ericfreeman of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/196980-vapor-lock-on-77-and-later-oil-pumps#post4303198)) \\ Then you can force feed oil the pump and on to the engine using this technique and it avoids having to mess with the sending unit.
     * With this homemade tool, all you have to do is use a grease gun (without grease) filled with oil and pump it into the system so a dry start can be avoided. {{:techtalk:ref:tools:check_ball_tester_and_prelube_fitting_by_bustert.jpg?direct&300|}} ((photo by bustert of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/168986-oil-pump-check-fixes/page2?t=1813185&page=2))
 ====== 1957-1976 Gear Driven Pumps ======

Trace: • REF: Custom Painting

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