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techtalk:ref:oil15 [2019/06/13 01:54] hippysmack [Testing per the FSMs] |
techtalk:ref:oil15 [2019/06/13 02:14] hippysmack [Between the oil pump and the filter] |
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{{:techtalk:ref:oil:installing_an_oil_gauge_8_by_hippysmack.jpg?direct&300|}} | {{: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|}} \\ | {{: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 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. | ||
+ | * 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. | ||
+ | * So, it is possible to notice different pressures from them 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. | ||
===== 86 and Up models ===== | ===== 86 and Up models ===== | ||
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{{: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|}} \\ | ||
- | ==== Between the oil pump and the filter ==== | + | ==== Testing between the oil pump and the filter ==== |
+ | 1985 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. \\ | ||
- | Do not test straight off the oil pump feed line. \\ | ||
- | 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_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|}} \\ | {{: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. | ||
- | * 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. | ||
- | * So, it is possible to notice different pressures from them 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. | ||
- | |||