INSTALLATION INSTRUCTIONS
STEP 1: Fitting The Filter To Cowling
Cut your 3" hose to the lengths drawn on the hose plus 1/4" on each end with a box knife or razor blade. Keep orientation filter side or engine side as marked. You require the center piece with the bend, so do not cut it. The two shorter pieces are scrap.
STEP 2:
Loosely assemble the components in the order shown. Tighten the clamp on the aluminum adaptor piece and the filter housing. This gives you the basic position of the filter assembly in relation to your engine.
STEP 3:
Trim Rh side of lower cowling to match what is required by filter to allow it to stick out of the cowling by about 2". You may need to trim one or both ends of the 3" angled hose (first cut in step 1) to position it in hole in cowling. Do not trim too much at a time. Rotate hose on engine to position filter in the hole in the cowling. Trim and rotate till you have a 2" exit of the cowling and a 5/16+" clearance space all around the filter to the cowling. Once you run the engine look for marks on the filter and trim in areas of marks to increase space and prevent hitting of the filter. This should leave about 1/2" of filter behind the cowling at the front and a little more then 1/2" at the back. Because of this, and the protected center part of the filter, there is no need for alternate air. For example if the front ices up, the engine can still breath through the back and or the protected areas making alternate air unnecessary.
STEP 4:
Tighten the last two hose clamps on the intake duct. The filter is now positioned and installed.
STEP 5: Fitting The Intake Scoop
Slide the scoop forward along the lower edge of the cowling until it is even with the forward edge of the filter as shown below. You can mark the outline on the cowling skin as to where the filter sits. Drill #40 the scoop and cowling at 1" spacing to hold scoop in position. You can trim scoop flange as needed to give you about a 5/8" to 3/4" lip for rivets to go through. Countersink holes in scoop for flush rivets but do not rivet yet.
STEP 6: Fitting The Engine Intake Air Temp Probes
Check the marks penned on the inside of your cowling for sensors. There should be two 1/2" holes and two 1/4" holes marked. BEFORE drilling make sure you have edge distance to the filter hole and they will not interfere with the scoop you just fit. The two 1/4" holes need anchor nuts installed on the OUTSIDE of the cowling. They are hidden by the filter and the scoop when finished. Check for edge distance before drilling to position these holes. You can now drill the holes in the cowling using the two 1/4" thick contour shims that you have not yet contoured. Now drill for the anchor nuts. Dimple the 4 anchor nut holes and rivet the nuts in position on the outside of the cowling skin. Position the contour shims in the cowling and file the outboard side till they fit the cowling contour. The lower one will take more filing than the top. The 1/4" spacers will need to be drilled up to 1/2" to fit the sensors. The temp sensors are held in position with the bolt, washer, sensor shim, cowl skin and finally the anchor nut. The sensors can easily be removed from the cowling by unplugging the quick disconnect fitting at the sensor. You do not need to unbolt the sensor when removing the bottom cowling (sensors are supplied with engine).
