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--- techtalk:evo:oil03h [2018/12/21 05:22]
hippysmack [86-90 Oil Pump Removal and Disassembly]
+++ techtalk:evo:oil03h [2019/01/09 01:43]
ixl2relax ↷ Links adapted because of a move operation
@@ Line 34: / Line 34: @@
 ===== Gasket Removal =====
 There are several ways to remove a stuck gasket. \\
-The use of metal abrasives on aluminum mating surfaces can result in distortion of the surface and a possible leak thereof. \\
+The use of metal abrasives on aluminum mating surfaces can result in distortion or scratching of the surface and a possible leak thereof. \\
 A straightedge razor blade can cut ruts in the surface guaranteeing a leak. \\
 Plastic scrapers and elbow grease is good alternative. \\
 Soaking the gasket with a solvent will soften it somewhat so removal is easier. \\
-However, the outer plate seal will have to be replaced before reinstallation. \\
+However, the outer plate and cover seals will have to be replaced before reinstallation. \\
 You may have to soak it and scrape several times while removing gasket layers. \\
@@ Line 49: / Line 49: @@
 So, it is common for the cover to be stuck to the pump body. \\
-According to the FSM, the pump to case mounting gasket should be coated with gasket sealer before installation. \\
+As mentioned above, the pump to case mounting gasket may be coated with gasket sealer. \\
 This is a debatable procedure as many have reported that is not necessary. \\
@@ Line 72: / Line 72: @@
 |  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 81: / Line 81: @@
 |  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|}}|
 ====== Disassembly ======
+Wiggle the cover off and the feed gerotors are exposed. \\
+Once you've gotten the cover off, you can continue to disassemble the pump from here. ((photos by Hippysmack)) \\
-|Wiggle the cover off and the feed gerotors are exposed
+Holding the pump upside down will allow you to remove and inspect parts individually as you go. \\
+It also helps to keep from dropping and losing some of the small parts. \\
+Inspect the parts for damage and wear while removing them. \\
+This can help diagnose certain areas for further inspection that might otherwise be looked over. \\
+  * Check for excessive scratching of the cover where the feed gerotors sit as well as the top and bottom of the feed gerotors.
+  * The feed gerotors are normally 'sandwiched' in place between the outer plate and the cover.
+    * When the cover comes off, they can be slid off the gearshaft.
+    * The pin in the gearshaft sticks out into the square recess in the inner gear but doesn't hold the gerotors in place.
+  * The outer plate is held in place by a solid pin in the gearshaft. \\
+    * It's a loose fit in the hole in the gearshaft and it's held in place by tension of the spring washer between the plates.
 |{{:techtalk:evo:oil:86-90_oil_pump_disassembly_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_disassembly_3_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_disassembly_4_by_hippysmack.jpg?direct&300|}}|
+  * Push in on the outer plate (if needed) to compress the spring and the pin can be removed with pliers or your fingers.
+    * Then the outer plate can be removed.
+    * The notch in the plate mates around the roll pin in the body that keeps it from rotating.
+    * It'll have to be lifted straight out or dumped out.
+    * Check the position and condition of the outer plate seal before removing it.
+    * It is pressed into the outer plate.
+    * Check the fit around the gearshaft. It should be a snug fit and sitting horizontal to the gearshaft.
+    * If not, this could easily contributed to wet-sumping in the engine.
+  * Then remove the spring washer.
+  * The inner plate is held in by the retaining ring.
 |{{:techtalk:evo:oil:86-90_oil_pump_disassembly_5_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_disassembly_6_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_disassembly_7_by_hippysmack.jpg?direct&300|}}|
+  * The outer plate seal will need to be pressed or pried out.
+    * You can set up a rig as in below (bearing race, a small socket and a rubber hammer).
+  * Make sure the socket is slightly smaller than the outer plate I.D.
+    * Gently tap the socket.
+  * And the seal will fall thru the bearing race (or larger socket etc).
+|{{:techtalk:evo:oil:83-90_outer_plate_3_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:83-90_outer_plate_4_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:83-90_outer_plate_5_by_hippysmack.jpg?direct&300|}}|
+  * Two small drivers were used here (1 to keep the ring from spinning, 1 to raise an end out of the groove in the gearshaft).
+    * The 1st screwdriver can be pushed into the slot in the gerotor to keep the ring from spinning.
+    * This will allow you to pick and out on one end and then switch back and forth between the two from there.
+  * Remove the retainer clip.
+  * Then pull out the inner plate.
 |{{:techtalk:evo:oil:86-90_oil_pump_disassembly_8_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_disassembly_9_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_disassembly_10_by_hippysmack.jpg?direct&300|}}|
+  * Inspect the roll pin in the pump body for straightness and damage.
+  * The return gerotors are also normally 'sandwiched' between the inner plate and the pump body.
+    * Turn the pump over and dump them out enough to get your fingers on them. \\ (being careful not to loose the second pin in the gearshaft)
+  * Inspect the area at the pump bore where the pin contacts it for damage. \\
+    * Also, make sure the pin is sitting on the outside of the bore surface instead of inside the bore. \\
+  * The second pin holds and keeps the gearshaft from coming out.
+    * Use a pair of needle nose pliers to remove it from the gearshaft.
+    * Hold the gearshaft with the other hand to keep it from falling when pulling this pin.
+    * Else, it could fall out and damage the teeth on the gear.
+  * Inspect the return gerotors and their mating surface in the pump body for scratches / damage. \\
 |{{:techtalk:evo:oil:86-90_oil_pump_disassembly_11_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_disassembly_12_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_disassembly_13_by_hippysmack.jpg?direct&300|}}|
+  * Remove the gearshaft and set it in a safe place to protect the gear teeth.
+  * Clean all parts with solvent (brake cleaner works well).
+  * With the parts spread out you now can now do further inspection on areas noticed while disassembling.
 |{{:techtalk:evo:oil:86-90_oil_pump_disassembly_16_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_disassembly_17_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_disassembly_14_by_hippysmack.jpg?direct&300|}}|