Upgraded Sniffle Valve Install - Lycoming 75444

[BillyT0020]

Finally got the new style sniffle valve installed on my 67F. For those of you fighting a rough idle which is solved by spraying cleaner/lubricant into Mooney’s modified AN fitting sniffle valve, the Lycoming version is a big improvement. 
 

If you’re lucky and yours is not smoked into the sump, you should be able to remove yours by removing the side cowlings and displacing the exhaust.
 

Loosen the passenger side (1 &3) exhaust nuts, leaving them on the studs, then completely removing the pilot side (2&4) nuts and washers which will allow the muffler fall down to the lower cowl. 
 

You should now have enough room to spin the old sniffle valve off the sump with a 7/16th wrench, after you remove the rubber fuel hose and 9/16th AN aluminum “extension” line. 
 

As is becoming par for the course for my Mooney, I was not so lucky and had the drop the lower cowl, and then remove the entire exhaust in order to get the leverage to break the old sniffle valve free. Fortunately I am becoming pretty good at doing this by myself, so wasn't that big of a deal. 
 

To install the new valve you will need 2 different 1/8” NPT fittings, one 90 degree male/female elbow, and one 45 male/female elbow. You will need to attach the 90 to the 45 before threading both of them into the sump as one assembly in order to have them clear the bottom of the sump. I put an o-ring and thread sealant on the male end of the 90 where it threads into the sump for good measure. Next you re-install and torque all the exhaust nuts to make sure you will clear the cut out in the exhaust shroud. 
 

From here you can thread the new sniffle valve into the female end of the 45 with a 3/4” hollow socket or stubby wrench. A nice benefit of this set up is you can now remove the new sniffle valve without having to displace the exhaust, or in my case drop the lower cowl, so you can clean it in the ultrasonic cleaner as needed.
 

You will also need a larger size fuel hose to fit the new valve, I just stopped at the National Aviation Parts Association on the way to the plane and had them size it for me. The new larger fuel hose is now too big for the metal drain on the lower cowl, but fortunately the old hose OD is a perfect fit for the ID of the new hose, so I just pushed a small piece of the old hose about an inch inside the cowl end of the new hose for a nice snug fit. Reattach the hose clamps and grab a drink. 
 

Pics below, hope this helps save someone some time. 
 

Billy