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Re: Metering rod for Carter WDO 531 S
#21
Home away from home
Home away from home

DavidPackard
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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

Posted on: 12/29 19:42
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Re: Metering rod for Carter WDO 531 S
#22
Just can't stay away
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Doc
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Thanks Dave! I reached out to Mikes Carburetor (where I got my kit) to get help also. You guys have never let me down!
But I do think that my wdo has been violated by someone in the past who lacked experience in carbs and mangled the metering rod spring. Sure wish I had modern pics or a video that would take you through the process for us greenhorns. Think my wdo might be a Frankencarb of miscellaneous parts.

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Posted on: 12/29 22:51
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Re: Metering rod for Carter WDO 531 S
#23
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Doc
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I might need some parts too, I think I might have a Carter wdo “ Frankencarb” because some things just don’t look right.

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Posted on: 12/29 23:30
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Re: Metering rod for Carter WDO 531 S
#24
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Doc
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Yeah i noticed the washers on the rods, primitive true, but effective. The part with the spring on it has me baffled, I’m not sure it’s the right part-or either its been modified, doesn’t look like what I can see in the 1940’s WDO service pics. Well, it ran before I took it off guess my goal is to make it run (better) after I put it back on 😅.
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Posted on: 12/30 9:25
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