Differences

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--- techtalk:ref:oil15 [2019/06/13 01:54]
hippysmack [Testing per the FSMs]
+++ techtalk:ref:oil15 [2022/09/27 05:34]
hippysmack [At Rocker Box (1957-1985)]
@@ Line 2: / Line 2: @@
 ====== REF: Oiling & Lubrication ======
 ====== Installing an Oil Pressure Gauge ======
+{{ :techtalk:evo:oil:oil_pressure_switch_threads_by_hippysmack.png?direct&300|}} ((drawing by Hippysmack)) \\
 The presence of oil pressure is usually measured by whether the oil light is on or not. \\
 The so called, idiot light, simply lets you know that the oil pressure is high enough to actuate the oil pressure switch and then the light. \\
@@ Line 48: / Line 50: @@
 {{:techtalk:ref:oil:installing_an_oil_gauge_8_by_hippysmack.jpg?direct&300|}}
 {{:techtalk:ref:oil:installing_an_oil_gauge_9_by_hippysmack.jpg?direct&300|}} \\
+==== Testing at the rocker box ====
+A Sportster does produce oil pressure in the rocker box: reportedly 3-5 psi at hot idle and 15psi+ on cold startup on an ironhead. ((simeli of the XLFORUM http://xlforum.net/forums/showthread.php?t=263589&highlight=lower+oil+pump&page=4)) \\
+Depending on the gauge selected, there may be little to no oil pressure registered on a high range gauge testing form the rocker box. \\
+(the gauge may show some pressure when the oil is cool and thick but may not show any after 5 minutes of running) ((mycle1000 of the XLFORUM http://xlforum.net/forums/showthread.php?t=263589&highlight=lower+oil+pump&page=3)) \\
+Due to the low oil pressure at the rocker box, \\
+Don't get scared when you look down after its hot and its on zero. ((vyper202 of the XLFORUM http://xlforum.net/forums/showthread.php?t=1698960)) \\
+  * Residual crankcase pressure and working pressure from the oiling tubes resides in the rocker boxes.
+    * On a cold startup, the pressure is higher due to the thicker oil present.
+    * As the engine warms up, the oil thins out and the pressure is reduced in the rocker boxes.
+    * Pulsating crankcase pressure (air and oil mist) resides over the entire breathing system as well as the rocker boxes. \\ (even though the crankcase pressure is vented through the cam cover).
+    * So, it is possible to notice different pressures with a pressure gauge testing from the rocker box.
+    * However, a gauge tapped into any rocker box will most likely measure air pressure instead of oil pressure.
+    * As air will compress and oil will not, therefore the readings should be lower than if you were testing at the oil pressure switch.
+    * Also oil ends up in the bottom of the rocker box to the head drains and air resides in the top of the box.
 ===== 86 and Up models =====
@@ Line 66: / Line 85: @@
 {{:techtalk:ref:oil:installing_an_oil_gauge_5_by_hippysmack.jpg?direct&300|}}
-{{:techtalk:ref:oil:installing_an_oil_gauge_3_by_hippysmack.jpg?direct&300|}}{{:techtalk:ref:oil:installing_an_oil_gauge_4_by_hippysmack.jpg?direct&300|}} \\
+{{:techtalk:ref:oil:installing_an_oil_gauge_3_by_hippysmack.jpg?direct&300|}} \\
+{{:techtalk:ref:oil:installing_an_oil_gauge_4_by_hippysmack.jpg?direct&300|}} {{:techtalk:ref:oil:installing_an_oil_gauge_10_by_hippysmack.jpg?direct&300|}} \\
-==== Between the oil pump and the filter ====
+==== Testing at the rocker box ====
-Do not test straight off the oil pump feed line. \\
+A Sportster does produce oil pressure in the rocker box. \\
-Oil flow will stop to the engine and the pump will build enough pressure to destroy the gauge. \\
-{{:techtalk:ref:oil:installing_an_oil_gauge_2_by_hippysmack.jpg?direct&300|}}
-{{:techtalk:ref:oil:installing_an_oil_gauge_6_by_hippysmack.jpg?direct&300|}}{{:techtalk:ref:oil:installing_an_oil_gauge_7_by_hippysmack.jpg?direct&300|}} \\
-==== Rocker Box ====
-A Sportster does produce oil pressure in the rocker box: reportedly 3-5 psi at hot idle and 15psi+ on cold startup on an ironhead. ((simeli of the XLFORUM http://xlforum.net/forums/showthread.php?t=263589&highlight=lower+oil+pump&page=4)) \\
 Depending on the gauge selected, there may be little to no oil pressure registered on a high range gauge testing form the rocker box. \\
 (the gauge may show some pressure when the oil is cool and thick but may not show any after 5 minutes of running) ((mycle1000 of the XLFORUM http://xlforum.net/forums/showthread.php?t=263589&highlight=lower+oil+pump&page=3)) \\
 Due to the low oil pressure at the rocker box, \\
 Don't get scared when you look down after its hot and its on zero. ((vyper202 of the XLFORUM http://xlforum.net/forums/showthread.php?t=1698960)) \\
   * Residual crankcase pressure and working pressure from the lifters resides in the rocker boxes.
     * On a cold startup, the pressure is higher due to the thicker oil present.
     * As the engine warms up, the oil thins out and the pressure is reduced in the rocker boxes.
-    * Excess crankcase pressure (air and oil mist) is vented differently between pre and post 91 engines.
+    * Pulsating crankcase pressure (air and oil mist) is vented differently between pre and post 91 engines.
       * On pre 91 engines, excess crankcase pressure is vented through the cam cover.
       * On post 91 engines, excess crankcase pressure is routed up the pushrod tubes and vented thru the rocker boxes to exit a hole in each head.
@@ Line 94: / Line 106: @@
     * However, a gauge tapped into any rocker box will most likely measure air pressure instead of oil pressure.
     * As air will compress and oil will not, therefore the readings should be lower than if you were testing at the oil pressure switch.
+    * Also oil ends up in the bottom of the rocker box to the head drains and air resides in the top of the box. \\
+==== Testing between the oil pump and the filter ====
+and prior engines use an oil filter in the return side of the system after the oil exits the engine. \\
+So an oil pressure gauge between the pump and filter would not tell you much about the engine feed oil. \\
+In 1986, the oil pressure switch was moved to an external feed side oil filter. \\
+Future feed oil from Evo oil pumps comes out of the pump to the filter pad. \\
+Consequently it's not possible to block the pump outlet with a pressure gauge without starving the engine of oil. \\
+So installing a gauge on the oil pump fittings is not going to be very helpful. \\
+Also, installing a pressure gauge straight into a gauge will result in the pump building up enough pressure to destroy the gauge. \\
+However, it is possible to install gauge in the feed line from the pump to the filter pad using a tee fitting. \\
+That way, as the pressure builds, it will both enter the gauge and the flow into the engine. \\
+{{:techtalk:ref:oil:installing_an_oil_gauge_2_by_hippysmack.jpg?direct&300|}}
+{{:techtalk:ref:oil:installing_an_oil_gauge_6_by_hippysmack.jpg?direct&300|}}{{:techtalk:ref:oil:installing_an_oil_gauge_7_by_hippysmack.jpg?direct&300|}} \\
@@ Line 157: / Line 185: @@
 {{:techtalk:evo:oil:98_cam_chest_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack))
+===== At the Oil Pump =====
+|Parts. ((photo by rocketmangb of the XLFORUM http://xlforum.net/forums/showthread.php?t=2049680))|
+|{{:techtalk:ref:oil:oil_pressure_gauge_rig_2_by_rocketmangb.jpg?direct&300|}}|
+|Hoses lengths. ((photo by rocketmangb of the XLFORUM http://xlforum.net/forums/showthread.php?t=2049680&page=2))|Hook one end to the filter pad. ((photo by rocketmangb of the XLFORUM http://xlforum.net/forums/showthread.php?t=2049680&page=2))|Hook the other end to the oil pump. ((photo by rocketmangb of the XLFORUM http://xlforum.net/forums/showthread.php?t=2049680&page=2))|
+|{{:techtalk:ref:oil:oil_pressure_gauge_rig_3_by_rocketmangb.jpg?direct&300|}}|{{:techtalk:ref:oil:oil_pressure_gauge_rig_10_by_rocketmangb.jpg?direct&300|}}|{{:techtalk:ref:oil:oil_pressure_gauge_rig_4_by_rocketmangb.jpg?direct&300|}}|
+|Hold or mount the gauge where you want it. ((photos by rocketmangb of the XLFORUM http://xlforum.net/forums/showthread.php?t=2049680&page=2))|||
+|{{:techtalk:ref:oil:oil_pressure_gauge_rig_5_by_rocketmangb.jpg?direct&300|}}|{{:techtalk:ref:oil:oil_pressure_gauge_rig_6_by_rocketmangb.jpg?direct&300|}}|{{:techtalk:ref:oil:oil_pressure_gauge_rig_9_by_rocketmangb.jpg?direct&300|}}|
 ====== IH ======

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