Why not just repair my valve?
Many of the original valves have too much damage to be repaired cost-effectively. McFarlane has repaired a lot of these original Cessna valves, and we know them well. However, we are now rejecting a big percentage of the valve cores sent to us. A lot of them have corrosion damage in the main body that is too severe to fix, or the O-ring retention area is damaged and too rough to seal. Many of the fittings are corroded through. The cam bearing is brass and easily corrodes the aluminum alloy cam. From years of experience, McFarlane found flaws that degrade the service life and repairability of the original Cessna valves. We directly address these issues in our improved design to provide a higher quality, longer-lasting valve.
Proven Design with Improvements
Improved corrosion resistance: McFarlane’s new valves are totally anodized where the original valves were Alodine conversion coated. This change drastically improves the surface durability, wear resistance, and corrosion resistance of all the components, and they will stay pretty too! Corrosion protection is important since the valves are at the lowest point in the fuel system without any upstream water separation or contaminate screening. We have also eliminated the brass bushing that corrodes the cam.
Improved O-ring retention: Modern machining processes lets us precision machine the O-ring capture cavity. The original valve O-rings were retained by staking (stamp forming) the housing. This process was inconsistent at best and distressed and weakened the surrounding aluminum structure.
Improved seal material: As with all McFarlane valves, the old nitrile seals have been replaced with Viton fuel proof seals.
Dual detent Springs: The original detent system had one spring that side loaded the cam shaft and cam seals. The new McFarlane valve uses two detent springs that eliminate the side loads that wear on the cam shaft and seals while giving a smooth detent feel.
More balanced fuel flow: Yesterday’s manual machining process of the original valves were often inconsistent enough to let one port flow more fuel than needed while the other port might flow a very marginal amount of fuel. The new McFarlane valve is computer machined for a perfect balance of fuel flow.
Fully Tested: You can rest assured that if it’s a new McFarlane valve or a valve repaired by McFarlane, it will be pressure, functional, and flow tested to perform to the highest standards.
View all New Fuel Selector Valve Assemblies, click here.