Question about Harley Davidson FLHT Electra Glide Standard Motorcycles

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1993 model: Oil Tank pressurized and blowing oil cap off. Any suggestions where to look first?

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All i can think of is something is wrong with the breather valve, in the right side crank case

Posted on Sep 06, 2009

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You haven't stated the make and model, but it's a relatively simple process to access the oil pump and blow out with an air-line. Also make sure your oil tank is empty, remove the oil cap and blow through the main oil line back into the tank.. This can then be flushed out.

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Why is it blowing off oil cap


Too much crankcase pressure for some reason? I've seen a melted piston cause so much crankcase pressure, it blew the pcv valve out of the valve cover and sprayed oil all over the engine compartment.

Is your oil cap threaded? If it is threaded, I don't think I've seen one of them blow off? Also, check crankcase ventilation system, pcv where applicable. Do you have a lot of blow-by from crankcase? I don't know your year--make--model or engine size?

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If you have an air filter/breather system with rubber tubes that end over the open intake area of the induction module in behind the air cleaner, sometimes people think they should not be positioned like that and bend them back and tuck them into bolt hole areas/openings in the filter backing plate casting underneath the breather tubes look like they should have the tube ends inserted into them and it the tubes are indeed bent back and the ends inserted so, this will close the tubes off and pressurize the engine internally and the oil tank and the pressure buildup will then blow the filler plug and dipstick out of the oil tank.

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Check for a pinched/blocked vent line.
Possible bad piston rings and over pressurizing the crank case (compression blow-by).
Overfilling the oil tank. Check with engine hot.
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It may also damage the oil seals.

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The engine breather pipe is clogged ! clean it and the problem sloved!

Good luck.

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1989 sportster building pressure in oil tank


A little pressure is normal on the sportster. I have seen where if the oil tank is over full it can blow the dip stick out. Most of us who ride sportsters keep the level showing on the dip stick about midway between the low and full line. Doing this will also help with oil blow by out the air cleaner.

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