Rotax 185 aircraft engine Tillitson carburator update, Reg's Newsletter 5

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 ROTAX 185cc (Lazair Ultralight Usage) CARBURETOR Update 

If you experience fuel in the fuel line attached to the carburetor leaking back down the line it could be the cause of two conditions. 

Refer to diagram below.

(1) the cork gasket under -the fuel cover on the carburetor is dry or cover is loose - remember its easier for the pump to draw air instead of the heavier fuel).

(2) The copper gasket used under the seat (of needle and seat) - was reused after seat removal and torqued too much. The torque on the seat should be 30 inch lbs. 

If used again or torqued too much it will distort causing the inlet seat (see diagram) to distort and thus leak. Therefore after cleaning the carburetor and removal of needle seat be sure to replace the copper gasket (Tillitson part # 16b-199) and torque to 30 inch lbs. 

Install the needle, adjust lever height, pour fuel mixture around cavity of seat area. Using a carburetor pressure checking gauge apply pressure to the fuel inlet hole in carb body that goes to needle (via a small pulse line diameter hose) and check to see if any bubbles emit from the seat area or the needle area. 

If bubbles come from the seat area the copper gasket is leaking. If the bubbles come from the needle area the seat insert (see diagram) is leaking. 

With the carburetor assembled the needle pop off pressure should be 12 to 14 lbs, and hold 5" of vacuum with out dropping. Make sure the needle and seat insert are fuel mix wetted for these tests.

HAPPY FLYING SEASON.

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