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Question Posted By: Guest on 3-29-2009
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| Make of Bike: |
h-d |
| Model of Bike |
flh |
| Year of Bike |
1968 |
| Engine Size |
88ci |
| Other info on Bike |
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| What's your question? |
why would motor start puking oil out of crankcase breather?
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| Details: |
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Answers:
- if it has been sitting awhile.The oil will seep past the check ball in the oil pump.fire it up a few times should clear out and be fine.Do not change oil without getting it started first you could possibly over fill it then have a big mess.have to get the bottom end cleaned out. By: Guest on: 3-29-2009
- he is absolutely correct. Any bike that has an oil tank mounted higher than the motor will do this after sitting. BUT, if the oil doesn't stop coming out the breather, you my have sheared the key on the return gears in the oil pump. Run the bike and check for foaming in the oil tank, that will mean the oil is returning to the tank. By: Guest on: 3-30-2009
- both these help answers are very good..40yrhd builder By: Guest on: 3-30-2009
- i had this prob with a sporty ,i laid it up over winter and when i went to use it i noticed the oil was low .so i topped up the oil ,got 5 mile down the road and the oil was coming out the crank case breather . i should have thought to myself when i put it away the oil level was ok so why did i need to top it up . lesson learned . By: biggles on: 3-31-2009
- Most engines that are just overbored don't require any increase in the breather valve opening. At 88 cubic inches in a '68, 74 cubic inch engine, you're 20% over the designed-in breather hole size.
With an increased crankcase pressure you're going to get more velocity through the breather screen which produces more oil mist in the camchest. Relieving that hole at the leading and following edge by about an 1/8th of an inch will give you more volume for the oil to be forced through the screen - at a slower velocity. Less oil mist...less oil out through the crankcase breather tube. I've even pulled apart strokers where instead of cutting out a larger case hole they've advanced the breather a notch to start the relief early. Not sure if that philosophy works, or not. No empirical evidence on my part. By: 47Knuckle-Dragger on: 3-31-2009
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