Re: Metering rod for Carter WDO 531 S

Posted by DavidPackard On 2023/12/29 19:42:37

Doc

On page 26 of the carburetor training book (available on this site) is a photograph of some of the details in that area of the WDO. The graphic is actually depicting the adjustment of the anti-percolator valves, but if you enlarge sufficiently the spring (61-120) can be seen mounted on the metering rod pin (150-81). What is not shown are the free ends of the spring, which simply loop around the metering rods. IIRC I build the entire rod/spring/pin/piston sub-assembly and install in the body. With the spring in-place in takes a bit of fiddling to align the metering rods, but once the air horn is in place the rods cannot dis-engage. If you want the spring free ends can be looped around the metering rods once you’re confident the rods are centered in the jet. Keep those small brass washers in-place . . . I think the design intent is that the washers will keep stones from falling into the jets which is possible (ask the man) with carburetors that use un-filtered air for air bleeds and float bowl venting.

dp