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techtalk:ref:oil07 [2020/09/09 02:55] hippysmack [Anti-Drainback Valve] |
techtalk:ref:oil07 [2022/08/20 22:47] hippysmack [Anti-Drainback Valve] |
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| But when the engine is shut down, it prevents the oil in the filter from draining back to the crankcase (oil pump in the case of Sportsters). \\ | But when the engine is shut down, it prevents the oil in the filter from draining back to the crankcase (oil pump in the case of Sportsters). \\ | ||
| - | There is no need to install a filter with an anti-drainback valve on a Sportster. \\ | + | **There is no need to install a filter with an anti-drainback valve on a Sportster**. \\ |
| The oil tank sits higher than the oil filter housing. So if any oil could drain back, oil can't run uphill by itself. \\ | The oil tank sits higher than the oil filter housing. So if any oil could drain back, oil can't run uphill by itself. \\ | ||
| Sportsters have an inherent problem with oil gravity draining into the engine when the engine is shut off and it sits for a while (sit-sumping). \\ | Sportsters have an inherent problem with oil gravity draining into the engine when the engine is shut off and it sits for a while (sit-sumping). \\ | ||
| This is due to either a worn check valve or worn clearances in the oil pump. \\ | This is due to either a worn check valve or worn clearances in the oil pump. \\ | ||
| - | So, oil in a Sportster will be pushed against the filter at all times without a drainback valve in the filter. \\ | + | So, oil in a Sportster will be pushed against the filter at all times __without__ a drainback valve in the filter. \\ |
| - | + | Oil will also be pushed against the filter at all times with a drainback valve in the filter. \\ | |
| + | The only thing a drainback filter will do is add restriction / raise pressure on the hose feeding the oil filter. \\ | ||
| This is from a HD Parts and Accessories Bulletin (PAB-398) dated 11-1-1988. Low restriction oil filter (63806-83) has been obsoleted. \\ | This is from a HD Parts and Accessories Bulletin (PAB-398) dated 11-1-1988. Low restriction oil filter (63806-83) has been obsoleted. \\ | ||
