Re: Adjusting an updraft Detroit Lubricator
Posted by Hotrodgss1 On 2018/4/16 12:26:17
Scott, you must have ESP because I was wondering the exact same thing yesterday! The 903 I'm working on idles beautifully and responds perfectly when I rev the engine, but as soon as it's put in gear and you try to drive it, it dies after a few seconds. However, if I turn on the electric pump it'll drive ok, but it obviously runs very rich. Couple of things to note...
1. I just rebuilt the fuel pump and it's operating perfectly (zero fuel leaks and no air is getting in).
2. The eccentric that pushes the fuel pump rod up & down is worn down approx 1/16". From the factory, they're supposed to lift it 5/16" but mine only travels 1/4" (.240" to be exact). So I acknowledge that this could be the problem but before I go through the enormous process of replacing the eccentric, I'd like to ensure the carburetor is adjusted properly so I can rule it out as the cause (or significantly contributing) to the problem.
That being said, I spent hours online and the only thing I found was what the T-Handle at the bottom is and how to adjust it. It's the air fuel mixture screw and the best adjustment procedures I found are contained within the 1930 and 1931 Owners Manuals. You can find them here on the Packardinfo website.
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1. I just rebuilt the fuel pump and it's operating perfectly (zero fuel leaks and no air is getting in).
2. The eccentric that pushes the fuel pump rod up & down is worn down approx 1/16". From the factory, they're supposed to lift it 5/16" but mine only travels 1/4" (.240" to be exact). So I acknowledge that this could be the problem but before I go through the enormous process of replacing the eccentric, I'd like to ensure the carburetor is adjusted properly so I can rule it out as the cause (or significantly contributing) to the problem.
That being said, I spent hours online and the only thing I found was what the T-Handle at the bottom is and how to adjust it. It's the air fuel mixture screw and the best adjustment procedures I found are contained within the 1930 and 1931 Owners Manuals. You can find them here on the Packardinfo website.
Attach file:
(169.67 KB)
(209.97 KB)
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