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Curtis-Toledo air compressor model ES-30

Someone put too much oil in the crankcase, which I guess caused the amperage of the motor to increase blowing the fuses. I removed the excess oil but the amparage is still high, could there be oil still in the cylinders?

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Try putting a few drops of really light oil into the intake while running (WD40?) this may thin the oil left in the cylinders and valves sufficiently to let it get blown out (assuming you are venting to the atmosphere) Also continuous operation will heat the oil and make it thinner helping to remove it and eventually reducing the current.

Posted on Oct 07, 2007

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Posted on Jan 02, 2017

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Mac2400 leaking air at oil breather hole


I have read both your questions and after taking both into consideration it sounds like it needs new piston rings. On a gas engine it is called blow by but both have a piston with rings on them, as they wear the end gap gets bigger and bigger allowing compressed air to bypass the rings into the crankcase where the oil is, the breather is there to allow air from the room to enter and exit as the piston goes up and down to avoid pressure or vacuum in the crankcase, the air on the top side of the piston is supposed to go into the tank but in your case some of it is going around the piston rings and into the crankcase building pressure and blowing oil out. There is not much inside a compressor like a gas engine, taking the head off and the oil pan should let you take off the connecting rod bolts and push the pistons out the top. This answer is based on the two comments of cant build all the air pressor and it is blowing oil out the crankcase breather. If you hit the 80 psi and unplug the compressor can you hear air coming from the limit switch box that the power cord goes into ? I will wait for your answer to continue.

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Ok, sounds like you are having water vapor condense in your crankcase, must be pretty humid where you are.
1- Make sure the crankcase has a vent on it somewhere.
2- Be sure you are running the compressor long enough to get the oil hot enough to evaporate any water that does get in there. If the compressor is over sized and just runs a few times a day it may not run long enough to flash off the water that does collect.
3- That unit looks pretty big if you sized it to spray paint with it may be way too big for your normal shop use (see 2 above).

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My compressor throwinng oil from breather andair.


It is normal to feel air coming from the breather. It is there to relieve pressure in the crankcase. If it is also throwing oil then make sure it is not over filled and also make sure you are using NON-DETERGENT oil. That is very important as you should never use regular motor oil.We use 30 weight non-detergent for all the compressors that we service.

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On your '93 model, the crankcase vent is down low on the engine behind the oil pump and it runs up to the air filter through a metal and rubber hose. I don't know how many miles you have on your engine but it you're getting any blow-by on the rings, this will increase the pressure in the crankcase. Most people simply re-route the crankcase breather underneath the bike and plug the hole on the backside of the air filter. Replace the metal line with a rubber hose and put a small filter in the end of the hose. Route the hose back behind the transmission and attach it to the transmission mounting plate just in front of the rear wheel.

This was the way the older Shovelheads were done from the factory for years until the EPA made them start running the crankcase vented air through the engine. In 1994, Harley went to the "head breather" system and moved the crankcase vents to the heads. Still, the oil mist in the vented air builds up in the air cleaner on these models as well.

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Without knowing what make or model you have, check the following:

1. Some, not all, compressor dip sticks have venting holes for the crankcase. If the vent holes are plugged or the check ball is stuck the dip stick will get forced out when the piston comes down.
2. Make sure the oil level is where it's supposed to be. Too much oil in the crankcase will cause the motor to work harder and the excess oil being splashed around the crank case can overwhelm the vents in the case or dip stick and again blow the dip stick out.
3. Worst case, you have worn or broken rings on the piston(s), a hole in a piston or a badly scored cylinder(s) and air is leaking past the piston and creating pressure in the crank case and blowing the dip stick out.

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Thanks for your visit today.

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