Differences

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--- techtalk:ih:oil01 [2020/05/19 17:15]
hippysmack [Oil Pump Check Valve]
+++ techtalk:ih:oil01 [2020/08/05 23:13]
hippysmack [Oil Lines to the Rockers]
@@ 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 357: / Line 359: @@
 With the check valve installed and the oil having to find it's way around the cup, pressure builds behind it in the pocket. \\
 This back pressure builds inside the pump and pushes the pressure switch contacts open, shutting off the oil light. \\
+The check valve spring does not control the amount of oil that enters the engine (unless it's stuck closed). \\
+The flow goes past the check no matter what. The spring pressure is very light. \\
+It regulates (creates and manages) the oil pressure in the pocket next to the switch before it enters the engine. \\
+That pocket is protected for one reason (to operate the oil switch, therefore the oil light). \\
+If you are not running an oil light, there is no reason to be concerned with the check valve (in regards to a running engine). \\
+You could remove the light and the check and it would not affect the oil flow thru the engine. \\
+The positive displacement oil pump will still deliver oil. \\
+The check/switch/light is a safety precaution to let you see the light and warn you that the pressure in the pocket is low. \\
+In theory and design, if the pressure in the pocket is low, oil flow would also be low. \\
+In practice, there are too many variables on a worn engine,pump, check, switch etc. to keep theory and design true all the time. \\
 The cup will stay off it's seat and open as long as there is sufficient oil pressure pushing against its spring. \\
@@ Line 401: / Line 415: @@
 |  Oil line sleeves. ((photos by sc72 of the XLFORUM http://xlforum.net/forums/showthread.php?t=1704463))  ||
-|{{:techtalk:ih:oil:83_model_oil_line_sleeves_1_by_sc72.jpg?direct&250|}}|{{:techtalk:ih:oil:83_model_oil_line_sleeves_1_by_sc72.jpg?direct&250|}}|
+|{{:techtalk:ih:oil:83_model_oil_line_sleeves_1_by_sc72.jpg?direct&250|}}|{{:techtalk:ih:oil:83_model_oil_line_sleeves_2_by_sc72.jpg?direct&250|}}|
 ===== Rocker Box =====
 The feed to the rockers is not a large diameter passage and not a lot of oil goes to the rocker gear. ((Ferrous Head of the XLFORUM http://xlforum.net/forums/showthread.php?t=753175&highlight=split+rocker+box)) \\
@@ Line 410: / 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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