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techtalk:ih:oil03g [2019/12/21 03:35] hippysmack [Check Ball Seat Repair] |
techtalk:ih:oil03g [2019/12/21 04:01] hippysmack [Shaft Seal Repair] |
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| The seal will harden over time and the elasticity will be moot so it is a replacement item. \\ | The seal will harden over time and the elasticity will be moot so it is a replacement item. \\ | ||
| However, even with a freshly overhauled pump there can be a sumping issue. | However, even with a freshly overhauled pump there can be a sumping issue. | ||
| + | |||
| + | There was no seal until mid 1958. \\ | ||
| + | Seepage into the return side from feed side will try to get into the cam case. \\ | ||
| + | It usually don't though. It ends up in crankcase instead. Same with any oil that can back feed down return line. \\ | ||
| + | Bikes that, when on the side stand, have the oil level in tank over top of the return or vent opening may siphon. \\ | ||
| + | This is why the XLH oil level is high in tank but the XLCH horseshoe tank is way lower. Having the vent siphon is worse than return. \\ | ||
| + | |||
| + | In the mid 60's, HD modded the XLH oil filter canister to break siphon on a rare circumstance that would really load the engine. \\ | ||
| + | The oil passes in the gap of the top of the keyed feed gear to reach the breather valve shaft. \\ | ||
| + | As the level in pump rises over time, oil passes between the shaft and it's bore in the cast iron top housing where it ends up around OD of the breather gear. \\ | ||
| + | It runs up the gear/housing clearance until it sees the port for the crankcase scavenge air and starts filling the crankcase. \\ | ||
| + | As an additional item when oil gets to the outside of iron housing tower thru the port, it can travel to front side of tower where it seeps into the cam case catch basin. \\ | ||
| + | Although this isn't a big issue. \\ | ||
| + | |||
| + | Oil in cam case is way more apt to puke out the breather than the crankcase oil. Guys with kickers will realize there are 2 different puke scenes. \\ | ||
| + | - When you push the kicker thru for the first time you hear that the bike is gonna puke but it doesn't actually puke until 2 or 3 kicks. \\ This is crankcase oil. | ||
| + | - As soon as you touch the kicker, oil is blowing out of tube. The cam case is full of oil. \\ This usually is a vent line back feeding tank oil to cam chest. | ||
| + | |||
| + | If you have this (2) scene cronic, it means you may be allowing the oil level to be so high its over the top of the vent in tank. \\ | ||
| + | Or, the vent pipe in the tank is broken. Either way, that's not the only problem. \\ | ||
| + | In order for oil to drain from the tank thru the vent line to cam case, air has to be able to get into tank. \\ | ||
| + | Finding and fixing the air leak will make a world of difference. \\ | ||
| + | Another point to ponder. \\ | ||
| + | It was once common for the K model to never puked but just leak. \\ | ||
| + | The few guys who still run the 62< spring loaded generator gear face seal will also have similar experience. \\ | ||
| + | These bikes are just as apt to puke when kicking as any others. Once running, they are pretty self contained unlike the 63> washer type. \\ | ||
| + | |||
| + | If you got an oil cooler or filter that's on the return line AND THESE ARE MOUNTED HIGH ON THE BIKE, THEY WILL GRAVITY BACKFEED into return side. \\ | ||
| + | This can happen when the return port on the tank is above the tank oil level. \\ | ||
| + | The replacement air flows into the open puke tube thru the cam chest into vent line and back to the tank where it gets sucked into the return line as cooler drains into motor. \\ | ||
| + | For you efficiency driven guys. Why aren't you sticking a piece of 3/8" hose to the end of the puke tube and putting the other end back in oil tank? | ||
| + | And for those who can't or won't run the restrictive 62< setup. You may want to consider a virtual 62< setup. It works like this: \\ | ||
| + | - Remove the tank cap. | ||
| + | - Fire the bike up. | ||
| + | - As fast as possible, plug the end of the puke tube with your index finger. | ||
| + | - Hold for 15 seconds. \\ If the pressure gets to high, pump more rpms to the motor and the pressure will lower. | ||
| + | - Release your finger. | ||
| + | - Put the cap back on. | ||
| + | - Ride | ||
| + | |||
| + | High tech but xl's seem to tolerate it. \\ | ||
| + | If you have a 70< that pukes after sitting and it still has a transfer valve or siphon tube 54<, try this the next time you park it. \\ | ||
| + | Crack or remove the primary filler plug (XLH) and remove the upper primary inspection cover screw (tin cover bikes). \\ | ||
| + | Put the plug back on just before your next ride and see if the puke goes away or gets better. \\ | ||
| + | You may be observing something that was designed on purpose from the factory. \\ | ||
| Below are some ideas for fixing a leaky shaft seal. \\ | Below are some ideas for fixing a leaky shaft seal. \\ | ||
