Primary filling 75 ironhead
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Primary filling 75 ironhead
Has anyone got any ideas about how to keep my oil from draining into my primary if i don't ride for a few days except closing the transfer valve off.I have already tried a new ball and spring and it actually got worse after the change.Thanks
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Joined: Jul 2006
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From: New Orleans
This is from a similar post by "bustert" from outer space.
looks like everyone is hitting in the ball park. yes the transfer valve can be plugged or removed and plugged with a square drive pipe plug that sits flush with left hand crankcase side. the early primary covers have a vent hole on the fill plug with a felt filter and this should be enough vent for the primary as you will no longer have c/c pressure entering the primary. this transfer valve was to allow oil transfer between c/c and primary. now for the real problem. if you are getting excess oil in the primary, it is not the transfer valve causing the problem. the gear case and oil tank are equalized via hose connection and the whole system is vented through the breather tube under generator, flywheel chamber vented through timed breather valve as was stated. the excess oil is coming from the oil pump either through the check ball behind the oil pressure switch but more than likely through the paper thing gasket seperating the two pump halves or the oil seal on the shaft seperating the two pump halves. bottom section pumps oil to the engine and the upper section pumps oil from gear case to oil tank. so if this is happening, your flywheel chamber will still fill up with oil. when this happens, the flywheel will pool the oil up into a trough that will empty into the gear case on the downward stroke when the breather valve opens. if the scavenger pump can not get rid of the oil fast enough, it will vent the oil pass the oil seperator on the generator shaft and out onto the ground. thus harley's will always mark their spot. unfortunately, the engine will have to be unbolted and removed or cocked sideways enough in order to remove the oil pump for repairs.
looks like everyone is hitting in the ball park. yes the transfer valve can be plugged or removed and plugged with a square drive pipe plug that sits flush with left hand crankcase side. the early primary covers have a vent hole on the fill plug with a felt filter and this should be enough vent for the primary as you will no longer have c/c pressure entering the primary. this transfer valve was to allow oil transfer between c/c and primary. now for the real problem. if you are getting excess oil in the primary, it is not the transfer valve causing the problem. the gear case and oil tank are equalized via hose connection and the whole system is vented through the breather tube under generator, flywheel chamber vented through timed breather valve as was stated. the excess oil is coming from the oil pump either through the check ball behind the oil pressure switch but more than likely through the paper thing gasket seperating the two pump halves or the oil seal on the shaft seperating the two pump halves. bottom section pumps oil to the engine and the upper section pumps oil from gear case to oil tank. so if this is happening, your flywheel chamber will still fill up with oil. when this happens, the flywheel will pool the oil up into a trough that will empty into the gear case on the downward stroke when the breather valve opens. if the scavenger pump can not get rid of the oil fast enough, it will vent the oil pass the oil seperator on the generator shaft and out onto the ground. thus harley's will always mark their spot. unfortunately, the engine will have to be unbolted and removed or cocked sideways enough in order to remove the oil pump for repairs.
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