Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
|
techtalk:ref:oil20 [2020/10/23 03:15] hippysmack [07-09 Oil Tank (62888-04A) Internals] |
techtalk:ref:oil20 [2022/06/08 16:21] hippysmack [Crankcase Pressure / Venting the Oil Tank] |
||
|---|---|---|---|
| Line 62: | Line 62: | ||
| * But there are plenty of riders who have ridden in below freezing temperatures that haven't had a problem. | * But there are plenty of riders who have ridden in below freezing temperatures that haven't had a problem. | ||
| - | ====== Crankcase Pressure / Venting in the Oil Tank ====== | + | ====== Crankcase Pressure / Venting the Oil Tank ====== |
| **Venting the oil tank**: \\ | **Venting the oil tank**: \\ | ||
| Line 139: | Line 139: | ||
| Read more on [[techtalk:ref:engmech04#fluid_drag|Fluid Drag]] above. \\ | Read more on [[techtalk:ref:engmech04#fluid_drag|Fluid Drag]] above. \\ | ||
| + | **2004-Present Sportsters use the oil pump and oil tank to expel most of the crankcase air into the cam chest**. \\ | ||
| + | Some goes out the pinion shaft bearing clearances but the only other outlet for piston downstroke air is the oil pump. \\ | ||
| + | The source of air intake to the crankcase on piston upstroke is the pinion shaft bearing clearance. \\ | ||
| + | The oil pump is steadily pushing oil and air out of the crankcase into the oil tank. \\ | ||
| + | |||
| + | {{:techtalk:ref:oil:2004-2006_sportster_oil_tank_oem_crankcase_pressure_to_tank_by_hippysmack.png?direct&400|}} ((drawing by Hippysmack)) {{:techtalk:ref:oil:2004-2006_sportster_oil_tank_vented_crankcase_pressure_to_tank_by_hippysmack.png?direct&400|}} ((drawing by Hippysmack)) \\ | ||
| ====== Oil Tank's Role vs Wetsumping ====== | ====== Oil Tank's Role vs Wetsumping ====== | ||
| Line 208: | Line 214: | ||
| The 2004-2009 oil tanks have had many problems with the seam between the top and bottom section leaking. \\ | The 2004-2009 oil tanks have had many problems with the seam between the top and bottom section leaking. \\ | ||
| Some have noticed this only during cold temperatures and some have had this problem at warmer temps. \\ | Some have noticed this only during cold temperatures and some have had this problem at warmer temps. \\ | ||
| + | But a cracked oil tank is not just restricted to those years as -04B and 2010-up tanks with the oil pressure relief have also been known to crack / leak. \\ | ||
| The 2004-2006 factory installed oil tank (62888-04) seems to have the worst problems. \\ | The 2004-2006 factory installed oil tank (62888-04) seems to have the worst problems. \\ | ||
| Line 228: | Line 235: | ||
| The vent hose won't get blocked full of oil. The oil will seal the vent tube off in the tank by hydraulic lock and not allow the air to leave the tank. \\ | The vent hose won't get blocked full of oil. The oil will seal the vent tube off in the tank by hydraulic lock and not allow the air to leave the tank. \\ | ||
| Then the pressure builds in the tank (oil pump is pressurizing the return hose but the vent would now be blocked). \\ | Then the pressure builds in the tank (oil pump is pressurizing the return hose but the vent would now be blocked). \\ | ||
| - | The pressure is not sent to the cam chest / engine since the vent tube would now be blocked. \\ | + | The pressure should not be sent to the cam chest / engine since the vent tube would now be blocked. \\ |
| The 2007-2009 oil tank (62888-04A) has a wider trough in the top section that the vent tube rises up into (the slot system was deleted). \\ | The 2007-2009 oil tank (62888-04A) has a wider trough in the top section that the vent tube rises up into (the slot system was deleted). \\ | ||
| Line 236: | Line 243: | ||
| In late 2009, the MoCo released a new oil tank version (62888-04B) for 2004-2009 models. It has the 10 psi relieve valve that is standard on the 2010 oil tank. \\ | In late 2009, the MoCo released a new oil tank version (62888-04B) for 2004-2009 models. It has the 10 psi relieve valve that is standard on the 2010 oil tank. \\ | ||
| + | The MoCo also moved the return tueb to the right side and got it away from the vent tube completely. \\ | ||
| + | |||
| + | **Yet still, the 10 PSI relief valves will open even in the later upgraded oil tanks**. \\ | ||
| + | 10 PSI is very high for crankcase pressure but the 10 PSI valve in the tank isn't the whole story. \\ | ||
| + | The pump is capable of making 100 PSI (either the feed or return side) and probably much more when the vent is blocked. \\ | ||
| + | So if the vent is hydro-locked with oil, tank pressure could get very high and that's when you may end up blowing the cap off or cracking the tank seam. \\ | ||
| To recap: | To recap: | ||
| Line 267: | Line 280: | ||
| {{:techtalk:ref:oil:07-09_xl_oil_tank_62888-04a_pic1_by_npaisnel.jpg?direct&200|}} {{:techtalk:ref:oil:07-09_xl_oil_tank_62888-04a_pic2_by_npaisnel.jpg?direct&200|}} {{:techtalk:ref:oil:07-09_xl_oil_tank_62888-04a_pic3_by_npaisnel.jpg?direct&200|}} \\ | {{:techtalk:ref:oil:07-09_xl_oil_tank_62888-04a_pic1_by_npaisnel.jpg?direct&200|}} {{:techtalk:ref:oil:07-09_xl_oil_tank_62888-04a_pic2_by_npaisnel.jpg?direct&200|}} {{:techtalk:ref:oil:07-09_xl_oil_tank_62888-04a_pic3_by_npaisnel.jpg?direct&200|}} \\ | ||
| + | ==== Testing 2004-up oil tank for hydro-lock ==== | ||
| + | The plastic oil tank can be tested during operation to see if oil is blocking the vent tube. \\ | ||
| + | This way, you'll know if it is the oil tank or the bottom end that needs to be addressed. \\ | ||
| + | By installing a manometer or a vacuum gauge to monitor crankcase pressure and an oil gauge to measure return pressure, it can be deduced as; \\ | ||
| + | * If the oil gauge pressure rises but the manometer doesn't change or doesn't change a lot, the oil tank is being pressurized. | ||
| + | * If the water blows out the open end of the manometer, the tank is not holding pressure and it's the crankcase air that is too high. \\ (you won't retain any water in a 3 foot manometer if the pressure reaches 1.5 PSI) | ||
| + | * If crankcase pressure is high on an Hg pressure gauge, same as with the manometer. The tank isn't being pressurized. | ||
| + | {{:techtalk:ref:oil:testing_the_oil_tank_by_hippysmack.png?direct&400|}} ((drawing by Hippysmack)) \\ | ||
