Differences

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--- techtalk:ih:oil01 [2020/05/19 17:56]
hippysmack [Oil Pump Check Valve]
+++ techtalk:ih:oil01 [2020/07/21 19:27]
hippysmack [Transfer Valve (76 and earlier)]
@@ Line 133: / Line 133: @@
 ====== Engine Oil Pressure (57-85) ======
 See also [[techtalk:ref:oil04#sportster_oil_pressure_57_to_present|Sportster Oil Pressure (57 to Present)]] in the REF section of the Sportsterpedia. \\
+On ironheads, 80% of oil pressure is sent to the bottom end and 20% is sent to the top end. ((2000 MMI Documents)) \\
 The oil pump is non-regulatory and delivers its entire volume of oil under pressure to the oil filter mount. \\
@@ Line 343: / Line 345: @@
 **The oil pump check valve plays a role in the operation of the  oil pressure switch**. \\
-{{:techtalk:ih:oil:77-85_oil_check_valve_1_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) {{:techtalk:ih:oil:aaa77-85_oil_pump_check_valve_pocket_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) \\
+{{:techtalk:ih:oil:77-85_oil_check_valve_1_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) {{:techtalk:ih:oil:77-85_oil_pump_check_valve_pocket_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) \\
 The check valve is not a pass through but instead a cartridge type one way check valve operated by a spring loaded cup against a seat pressing at 4-6 PSI. \\
@@ Line 422: / Line 424: @@
 ====== Transfer Valve (76 and earlier) ======
-The foregoing by Dr Dick ((http://xlforum.net/forums/showpost.php?p=3886388&postcount=40))
+There is only one moving part in the transfer valve assembly which is the triangular shaped disc in the pics below (reed, patel, wafer or whatever you'd call it). \\
+It's a triangular piece of .009" thick stainless steel that can move about .015" left to right in the valve. There is no spring. \\
+In a RUNNING engine, it is a one way valve that lets air and oil pass through it from primary case to flywheel case. \\
+[[https://www.youtube.com/watch?v=EOu0uR2ulF8|Click here]] to see a video of the direction of flow. \\
+Positive crankcase pressure pushes the reed to the left and seals a small hole preventing flow into the primary. \\
+Vacuum in the crankcase pulls the reed to the right up against a stop that has a larger hole. \\
+The 3 cuts that make the reed a triangle allow air/oil to flow around it into the crankcase. \\
+Without the engine running and with no spring to maintain a tight seal, oil can slowly leak through and let wet sumped oil pass into the primary. \\
+On engine start up the excess oil in the primary should be transferred back into the engine. \\
+The thread is 3/4"-16. \\ There is nothing to wear out. However anything that stops the movement of the reed (rust or dirt) means the valve won't work. \\
+The one taken apart here was gummed up with old oil that had a tar like consistency. \\
+{{:techtalk:ih:oil:transfer_valve_exposed_pic_1_by_needspeed.jpg?direct&800|}} ((photo by needspeed of the XLFORUM http://xlforum.net/forums/showthread.php?t=2077280)) \\
+Also, as a test, a container of 20w-50 oil at room temperature was allowed to gravity drain from the transfer valve. \\
+It took 48 hours for 100 milliliters of oil to drip through the valve. \\
+{{:techtalk:ih:oil:transfer_valve_exposed_pic_3_by_needspeed.jpg?direct&300|}} ((photo by needspeed of the XLFORUM http://xlforum.net/forums/showthread.php?t=2077280)) \\
+Here are a few drawings detailing the assembly: \\
+{{:techtalk:ih:oil:transfer_valve_exposed_pic_2_by_needspeed.jpg?direct&500|}} ((drawing by needspeed of the XLFORUM http://xlforum.net/forums/showthread.php?t=2077280)) \\
+----
+...... The foregoing by Dr Dick ((http://xlforum.net/forums/showpost.php?p=3886388&postcount=40))
 The transfer valve is staked into position. ((Ferrous Head of the XLFORUM http://xlforum.net/forums/showthread.php?t=581947&page=6)) \\

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