Differences

This shows you the differences between two versions of the page.

--- techtalk:ih:oil03e [2018/12/21 20:57]
hippysmack [Disassembly]
+++ techtalk:ih:oil03e [2021/11/07 05:32]
hippysmack [Gerotors]
@@ Line 64: / Line 64: @@
 |  Carburetor Cleaner ((photo by Hippysmack http://xlforum.net/forums/showthread.php?t=2071153&page=4))  |||
-|{{:techtalk:ref:tools:parts_cleaner_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:tools:parts_cleaner_3_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:parts_cleaner_6_by_hippysmack.jpg?direct&300|}}|
+|{{techtalk:ref:genmsr:parts_cleaner_1_by_hippysmack.jpg?direct&300|}}|{{techtalk:ref:genmsr:parts_cleaner_3_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:parts_cleaner_6_by_hippysmack.jpg?direct&300|}}|
   * After soaking, open the lid, remove the small bucket inside by the handle, set the bucket on the ground and wash the parts cleaner off with a water hose.
@@ Line 73: / Line 73: @@
 |  Cleaning and soaking gaskets for more easy removal ((photos by Hippysmack http://xlforum.net/forums/showthread.php?t=2071153&page=4))  ||
-|{{:techtalk:ref:tools:parts_cleaner_4_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:tools:parts_cleaner_2_by_hippysmack.jpg?direct&300|}}|
+|{{techtalk:ref:genmsr:parts_cleaner_4_by_hippysmack.jpg?direct&300|}}|{{techtalk:ref:genmsr:parts_cleaner_2_by_hippysmack.jpg?direct&300|}}|
 |{{:techtalk:ih:oil:77-e83_oil_pump_5.2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-e83_oil_pump_5.3_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-e83_oil_pump_5.1_by_hippysmack.jpg?direct&300|}}|
@@ Line 150: / Line 150: @@
 |{{:techtalk:ih:oil:77-e83_oil_pump_10_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-e83_oil_pump_parts_by_hippysmack.jpg?direct&300|}}|
-====== Gerotors ======
+====== Inspection / Maintenance ======
 |{{:techtalk:ih:oil:77-85_oil_pump_feed_gerotors_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_scavenger_gerotors_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-e83_gerotors_by_hippysmack.jpg?direct&300|}}|
-=== Specs and Servicing ===
+  * **Inspection**: \\ With the replacement of the gear driven oil pump by the new gerotor style pump; \\ HD issued a recommendation to dealers regarding servicing of the new style oil pumps. ((HD Service Bulletin #M-711 dated June 3, 1977))
-With the replacement of the gear driven oil pump by the new gerotor style pump; \\
+    * Zero gerotor (gear) side clearance must be maintained by the flat spring located between the upper and lower gerotor sets to provide adequate oil pressure. \\ For the spring to function properly, the upper face of the lower feed gerotors must extend slightly above the cover to prevent any side clearance. \\ (which would allow oil to get past the gerotors and reduce oil pressure) \\ If you encounter reduced oil, no oil pressure (oil pressure light comes on or stays on) or otherwise need to disassemble the oil pump for any reason, \\ The gerotors should be checked and serviced.
-HD issued a recommendation to dealers regarding servicing of the new style oil pumps. ((HD Service Bulletin #M-711 dated June 3, 1977))
+      * Using a straightedge across the feed gerotor set (installed) surface; \\ Measurement should be taken with a feeler gauge from the gerotor surface to the ridge of the edge of the aluminum cover:
+      * The thin, feed gerotors (26492-75) in the oil pump cover (26486-75) should extend .001"-.005" above the cover's aluminum ridge.
+      *  The later feed gerotors extend up to .011" above the ridge. \\ If the feed gerotors do not extend above the ridge within the specified range, \\ Remove and sand the ridge evenly until the gerotors extend properly when inserted. \\ Lay some sandpaper on a flat surface (#280 grit then #400 grit to finish). \\ Invert the cover and sand the ridge then check the measurement with a micrometer. \\ Make sure that both the inner and outer gerotors are the same thickness also.
-  * Zero gerotor (gear) side clearance must be maintained by the flat spring located between the upper and lower gerotor sets in the oil pump to provide adequate oil pressure.  For the spring to function properly, the upper face of the lower feed gerotors must extend slightly above the cover to prevent any side clearance which would allow oil to get past the gerotors and reduce oil pressure. ((HD Service Bulletin #M-711 dated June 3, 1977))
+      * An oil pump cover found with an uneven gerotor surface should be removed. \\ If the gerotor widths measure equally but they are not equal in height when placed into the cover, the cover surface is not flat. \\ If the gerotors will not sit flat in the cover then the cover should be replaced. \\ Be sure to check the gerotors in the new/replacement cover using a straight edge to assure a level surface and the proper elevation above the ridge.
+    * Other possible causes of low oil pressure;
-  * If you encounter reduced oil, no oil pressure (oil pressure light comes on or stays on) or otherwise need to disassemble the oil pump for any reason, the gerotors should be checked and serviced. ((HD Service Bulletin #M-711 dated June 3, 1977))
+      * Air leakage into the pump due to a loose hose clamp at the oil pump and/or oil tank feed hose fitting. \\ If using crimped hose connectors, check them to make sure they are tight. \\ If using worm drive hose clamps, make sure they are tight. \\ Also make sure they haven't been tightened too much (which can cut into the hose under the clamp). \\ This will prevent air leakage into the system which could cause loss of oil pressure due to an airlock in the oil pump.
-  * Using a straightedge across the feed gerotor set (installed) surface, measurement should be taken with a feeler gauge from the gerotor surface to the ridge of the edge of the aluminum cover:
-    * The thin, feed gerotors (26492-75) are in the oil pump cover (26486-75) and should extend .001" - .005" above the cover's aluminum ridge which surrounds them. ((HD Service Bulletin #M-711 dated June 3, 1977))
-    *  The later gerotors extend up to .011" above the ridge.  If the feed gerotors do not extend above the ridge within the specified range, remove them, lay some sandpaper (#280 grit to start - #400 grit to finish), invert the cover and sand the ridge evenly until the gerotors extend properly when inserted. Check the measurement with a micrometer to see that both the inner and outer gerotors are the same thickness. ((HD Service Bulletin #M-711 dated June 3, 1977))
-    * If the widths measure equally but the gerotors are not equal in height when placed into the cover, then the cover surface is not flat and the cover should be replaced.  Be sure to check the gerotors in the new cover using a straight edge to assure a level surface and the proper elevation above the ridge. ((HD Service Bulletin #M-711 dated June 3, 1977))
-  * Another possible cause of low oil pressure is air leakage into the pump due to a loose hose clamp at the oil pump feed hose fitting (63540-62) and at the oil tank feed hose fitting. If the existing feed hose clamp (10020) cannot be evenly and securely crimped to the fittings, remove the clamp and install a worm drive hose clamp. This will prevent air leakage into the system which could cause loss of oil pressure due to an airlock in the oil pump. ((HD Service Bulletin #M-711 dated June 3, 1977))
-  * Oil pump covers found with an uneven gerotor surface should be removed. ((HD Service Bulletin #M-711 dated June 3, 1977))
+  * **General Wear Issues**:
+    * Gerotors can crack but still work to a point. \\ That point may be where it finally wears out the pump housing to gerotor OD clearance thus delivering less oil to the motor. \\ There is no spec for gerotor to housing clearance. \\ But even hairline cracks in a gerotor will allow it to expand when hot. \\ This will eat away at the housing bore, heat up the pump and internals causing damage to other parts as well. \\
+    * The solid pins in the side of the gearshaft are responsible for turning the gerotors. \\ The pins will wear and sometimes they will shear off. Each gerotor set has it's own pin. \\ So it's possible for the pin on the return side to shear with the pin on the feed side staying in tact or vice-versa. \\ So you could have feed oil to the motor but no oil return to the tank or vice-versa. \\ Always check for oil returning to the tank when diagnosing any suspected oiling issues (or any time after checking the oil for that matter). \\ Never check oil level without the motor being up to operating temp. \\ So before you shut the motor down to check the oil, have a look in the tank to verify that oil is returning.

Trace:

Differences

Navigation

Search

Toolbox