Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision | ||
|
techtalk:evo:oil01 [2024/02/06 00:34] hippysmack [Engine Oil Pressure and Testing] |
techtalk:evo:oil01 [2024/02/21 18:53] (current) hippysmack [Engine Oil Pressure and Testing] |
||
|---|---|---|---|
| Line 74: | Line 74: | ||
| **Cold oil flows slower and at higher pressure than hot oil**. During start-up of a cold (ambient temp) engine, oil is thicker, oil pressure will be higher than normal and oil circulation will be somewhat restricted to flow within the oiling path. Oil pressure should be checked when hot (operating temp) to meet the specs in the manuals. As the oil heats up it gets thinner, flows faster and pressure is lowered. \\ | **Cold oil flows slower and at higher pressure than hot oil**. During start-up of a cold (ambient temp) engine, oil is thicker, oil pressure will be higher than normal and oil circulation will be somewhat restricted to flow within the oiling path. Oil pressure should be checked when hot (operating temp) to meet the specs in the manuals. As the oil heats up it gets thinner, flows faster and pressure is lowered. \\ | ||
| - | **The oil path, as designed, creates variable system pressures**. The restrictions in the oil feed path (hose size, routing paths, orifice sizes, etc) manipulate oil flow and oil pressure. Each restriction in the feed path, whether chamber size, bends or orifice size, lowers the flow volume and pressure downstream of the restriction. I.E., A restrictor in the end of the pinion shaft will lower the amount of oil that gets passed it to the crankpin/lower end bearings but the smaller amount of oil that does flow past the restrictor flows at a faster rate. And lowering the amount of oil to the pinion shaft also sends more oil up to the rocker boxes. The OEM specs were meant to show the amount of pressure that should be present at the pump without further modifications to the feed system. Altering the OEM feed path will change the pressure at the pump to the extent of the modification. | + | **The oil path, as designed, creates variable system pressures**. The restrictions in the oil feed path (hose size, routing paths, orifice sizes, etc) manipulate oil flow and oil pressure. Each restriction in the feed path, whether chamber size, bends or orifice size, lowers the flow volume and pressure downstream of the restriction. I.E., A restrictor in the end of the pinion shaft will lower the amount of oil that gets passed it to the crankpin/lower end bearings but the smaller amount of oil that does flow past the restrictor flows at a faster rate. And lowering the amount of oil to the pinion shaft also sends more oil up to the rocker boxes. There will be lower pressure at the crankpin / lower end bearings than at the oil pump. There will also be lower pressure at the rocker arms then there will be at the oil pump. The OEM specs were meant to show the amount of pressure that should be present at the pump without further modifications to the feed system. Altering the OEM feed path will change the pressure at the pump to the extent of the modification. |
| **Restrictions in the oil path harness and manipulate the pressure created at the pump**. Pressure is always greatest at the oil pump outlet. As the oil passes each restriction (bends, smaller passages, orifices as well as elevation), pressure will be lower from thereon depending on how much of a restriction is created and for how long. \\ | **Restrictions in the oil path harness and manipulate the pressure created at the pump**. Pressure is always greatest at the oil pump outlet. As the oil passes each restriction (bends, smaller passages, orifices as well as elevation), pressure will be lower from thereon depending on how much of a restriction is created and for how long. \\ | ||
| Line 80: | Line 80: | ||
| **Oil volume to the motor is dependent on pump capabilities and RPM**. When an engine is operated at higher speeds; the volume of oil circulated through the oiling system increases, resulting in higher oil pressure throughout the feed path. As engine speed is reduced, the volume of oil pumped is also reduced, resulting in lower oil pressure throughout the feed path. \\ | **Oil volume to the motor is dependent on pump capabilities and RPM**. When an engine is operated at higher speeds; the volume of oil circulated through the oiling system increases, resulting in higher oil pressure throughout the feed path. As engine speed is reduced, the volume of oil pumped is also reduced, resulting in lower oil pressure throughout the feed path. \\ | ||
| + | ==== Oil Pressure Light ==== | ||
| + | If the oil pressure light stays on at speeds above idling, always check the oil supply first. \\ | ||
| + | Then if the oil supply is normal, look inside the oil tank to determine if oil is returning to the tank from the return hose with the engine running. \\ | ||
| + | If oil is returning to the tank, there is some circulation and the engine may be run a short distance if necessary. \\ | ||
| + | If no oil is returning, shut the engine off until the trouble is located and fixed. \\ | ||
| + | |||
| + | Conditions causing the oil light to stay on; \\ | ||
| + | Low or diluted oil supply, \\ | ||
| + | Or a plugged lifter screen (86-91) under the plug between the tappets, \\ | ||
| + | A grounded oil signal switch wire, \\ | ||
| + | Faulty oil switch, \\ | ||
| + | Faulty or weak oil pump, \\ | ||
| + | Clogged feed hose (in freezing weather from ice and sludge preventing the circulation of oil). \\ | ||
| ===== Year Model Specifics ===== | ===== Year Model Specifics ===== | ||
| Line 352: | Line 365: | ||
| * [[techtalk:evo:oil01q|Oil Pressure Switch Removal and Installation]] | * [[techtalk:evo:oil01q|Oil Pressure Switch Removal and Installation]] | ||
| - | See also [[techtalk:ref:svcproc30#testing_the_oil_pressure_switch|Testing the Oil Pressure Switch]] in the Ref section of the Sportsterpedia. \\ | + | See also in the REF section of the Sportsterpedia: \\ |
| + | * [[techtalk:ref:oil19|Homemade Oil Pressure Light]] in case you don't have one. \\ | ||
| + | * [[techtalk:ref:svcproc30#testing_the_oil_pressure_switch|Testing the Oil Pressure Switch]] \\ | ||
| The oil pressure switch (for the oil light) is a pressure actuated diaphragm type on / off switch basically. \\ | The oil pressure switch (for the oil light) is a pressure actuated diaphragm type on / off switch basically. \\ | ||
| Line 387: | Line 403: | ||
| |{{:techtalk:evo:oil:oil_pressure_switch_on_88_model_by_kevmic28.jpg?direct&300|}}|{{:techtalk:evo:oil:oil_pressure_switch_on_99_sportster_by_hellhound.jpg?direct&300|}}|{{:techtalk:evo:oil:oil_pressure_switch_on_04_sportster_by_hellhound.jpg?direct&300|}}| | |{{:techtalk:evo:oil:oil_pressure_switch_on_88_model_by_kevmic28.jpg?direct&300|}}|{{:techtalk:evo:oil:oil_pressure_switch_on_99_sportster_by_hellhound.jpg?direct&300|}}|{{:techtalk:evo:oil:oil_pressure_switch_on_04_sportster_by_hellhound.jpg?direct&300|}}| | ||
| - | ===== Oil Pressure Light ===== | ||
| - | If the oil pressure light stays on at speeds above idling, always check the oil supply first. \\ | ||
| - | Then if the oil supply is normal, look inside the oil tank to determine if oil is returning to the tank from the return hose with the engine running. \\ | ||
| - | If oil is returning to the tank, there is some circulation and the engine may be run a short distance if necessary. \\ | ||
| - | If no oil is returning, shut the engine off until the trouble is located and fixed. \\ | ||
| - | |||
| - | Conditions causing the oil light to stay on; \\ | ||
| - | Low or diluted oil supply, \\ | ||
| - | Or a plugged lifter screen (86-91) under the plug between the tappets, \\ | ||
| - | A grounded oil signal switch wire, \\ | ||
| - | Faulty oil switch, \\ | ||
| - | Faulty or weak oil pump, \\ | ||
| - | Clogged feed hose (in freezing weather from ice and sludge preventing the circulation of oil). \\ | ||
| ===== Oil Check Valve (77-E87)===== | ===== Oil Check Valve (77-E87)===== | ||
| See [[techtalk:evo:oil01k#oil_check_valve_86-e87|Oil Check Valve (86-E87)]] in the Sportsterpedia. \\ | See [[techtalk:evo:oil01k#oil_check_valve_86-e87|Oil Check Valve (86-E87)]] in the Sportsterpedia. \\ | ||
| - | The Oil Check Valve is located behind the threaded filter adapter in the center of the oil filter mount. The filter adapter I.D. was enlarged on the filter end to accept the check valve. The check valve operation is dependent on receiving filtered oil (through the filter media) to lift the check valve cup and allow oil to pass. Therefore, a stopped up oil filter media condition (not allowing flow or enough flow) may not produce enough oil pressure to open the check valve before the filter bypass opens. \\ | + | The Oil Check Valve on 1986-E1987 engines is located behind the threaded filter adapter in the center of the oil filter mount. The filter adapter I.D. was enlarged on the filter end to accept the check valve. The check valve operation is dependent on receiving filtered oil (through the filter media) to lift the check valve cup and allow oil to pass. Therefore, a stopped up oil filter media condition (not allowing flow or enough flow) may not produce enough oil pressure to open the check valve before the filter bypass opens. \\ |
| - | **The oil pump check valve plays a role in the operation of the oil pressure switch**. \\ | + | **The oil pump check valve plays a role in the operation of the oil pressure switch**. \\ |
| + | It adds additional restriction in the feed path which raises the oil pressure in the chamber feeding the switch. \\ | ||
| |{{:techtalk:evo:oil:77-e87_oil_check_valve_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-e87_oil_check_valve_location_2_by_hippysmack.jpg?direct&300|}}| | |{{:techtalk:evo:oil:77-e87_oil_check_valve_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-e87_oil_check_valve_location_2_by_hippysmack.jpg?direct&300|}}| | ||
| Line 429: | Line 433: | ||
| This reduction in pressure is also sensed by the oil pressure switch. When the pressure drops, the diaphragm eases back toward the closed position. If the pressure is low enough, the contacts will close or partially make contact while closing or intermittently opening and closing. The oil light will come on or flicker depending on the action of the contacts. \\ | This reduction in pressure is also sensed by the oil pressure switch. When the pressure drops, the diaphragm eases back toward the closed position. If the pressure is low enough, the contacts will close or partially make contact while closing or intermittently opening and closing. The oil light will come on or flicker depending on the action of the contacts. \\ | ||
| - | The pressure switch requires no back pressure from the engine to stay open. It opens solely from the pressure generated from the oil pump with the assistance of the check valve to hold some of that pressure in the pump. So, it is possible but not likely to have a stuck closed check valve with no oil light on. \\ | + | The pressure switch requires no back pressure from the engine to stay open. It opens solely from the pressure generated from the oil pump with the assistance of the check valve to hold some of that pressure in the pump. \\ |
| ===== Oil Check Ball (L87 and Up) ===== | ===== Oil Check Ball (L87 and Up) ===== | ||
| Line 466: | Line 470: | ||
| | Check Ball (26437-86A) L87-91 \\ (replaced by (26437-86B) ) ((photo by Hippysmack)) | Check Ball (26437-86B) 92-Up ((photo by jordan1200 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-bottom-end/196304-oil-filter-mount-and-check-valve?t=2072806)) | Check Ball and Spring Kit (33116-86A) for 86 -up Models ((photo by Hippysmack)) | | | Check Ball (26437-86A) L87-91 \\ (replaced by (26437-86B) ) ((photo by Hippysmack)) | Check Ball (26437-86B) 92-Up ((photo by jordan1200 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-bottom-end/196304-oil-filter-mount-and-check-valve?t=2072806)) | Check Ball and Spring Kit (33116-86A) for 86 -up Models ((photo by Hippysmack)) | | ||
| - | ====== Wet Sumping / Sit Sumping ====== | + | |
| - | See article on [[techtalk:ref:oil10|Wet Sumping]] in the REF section of the Sportsterpedia | + | |
| \\ | \\ | ||
