Frequently Asked Questions
Air/Oil Separators for Crankcase Breathers

QUESTION: How does it work?
ANSWER: Designed specifically for aviation, (not diesel trucks or boats like some others) it removes oil mist from the crankcase breather air. It employs a unique 5-stage processor to liquefy the oil, scrub the air clean and return the oil to the crankcase. Water vapor is discharged overboard with the air.

QUESTION: How does the oil get back to the engine?
ANSWER: There are multiple options. Many engines have one to three low pressure oil ports, which can be used. Engines with exposed rocker box oil drain tubes can use a 20^o welded “Y” connection as pictured on our web site. Any engine can use a hose barb through the rocker cover, positioned centrally away from the rockers and above the oil level.

QUESTION: Will it fit my airplane or helicopter?
ANSWER: It is STCd for all 1,600 certified aircraft. Antiques and ex-military are field approved without hesitation.

QUESTION: How much time for installation?
ANSWER: Most mechanics take 1 to 1 1/2 hours. One mechanic does them in 15 minutes while changing the oil, so he doesn’t charge for the service.

QUESTION: What are the connection sizes?
ANSWER: For Models 300 and 300-B, ¾” for inlet and outlet air. ¼” for the oil return. The H and HB Models have 3/8” oil returns. The 400XL has 1” inlet and outlet tubes with a 3/8” oil return.

QUESTION: What maintenance is required?
ANSWER: Generally, none. They can be flushed, at annuals or whenever desired, using any neutral solvent and blowing dry with shop air.

QUESTION: I have a wet vacuum pump. Will this still work?
ANSWER: Yes. These units are for the crankcase breather. You will need an additional Model 600WP for your wet vacuum pump. Read about the advantage of  a second unit in the Wet Pump heading.

~ Bill Sandman ~

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