Re: Peterson's 1940 Packard
Posted by West Peterson On 2010/6/25 9:00:42
With some fuel issues developing during times when fuel issues shouldn't be appearing, I decided to finally rebuild my mechanical AC dual-action pump. While my windshield wipers work quite well, upon acceleration, they slowed down significantly... another indication that the fuel pump may need some attention.
Taking Big Kev's lead, I decided to rebuild it myself using his directions that he has posted.
It turns out that Big Kev's dual-action pump is quite different on the inside than mine, but since mine actually seemed a little simpler, the best thing I took away from his directions is that it's something you can do on your own kitchen table (I'm the king of my castle... when my wife's not at home)
My 15-year-old son helped me through the whole process.
ONE THING, though, that Kev does not show or tell about in his instructions is that the diaphragms need to be "pre-loaded" before screwing down the fuel and air bodies.
If the fuel casting screws are tightened while the diaphragm assemble is relaxed, it will tend to get stretched (when put into service) to the point of elongating the screw holes in it, and eventually the material will fail causing a leak. This is more important on the fuel side than on the vacuum side.
To "pre-load" the diaphragm, you want the assembly (rocker arm) pulled down as far as it will go before tightening the screws. On the vacuum side you only want to bring the arm far enough to see the diaphragm material flatten out between the two castings before tightening the screws.
When I get some time, I will put together a how-to, as I took photos during the entire process.
The first photo is my son, David. This shows him screwing the fuel assembly together BEFORE we realized that we needed to "pre-load" the assembly, which involves the use of a bench vise and two sets of hands.
Attach file:
(60.49 KB)
(61.83 KB)
Taking Big Kev's lead, I decided to rebuild it myself using his directions that he has posted.
It turns out that Big Kev's dual-action pump is quite different on the inside than mine, but since mine actually seemed a little simpler, the best thing I took away from his directions is that it's something you can do on your own kitchen table (I'm the king of my castle... when my wife's not at home)
My 15-year-old son helped me through the whole process.
ONE THING, though, that Kev does not show or tell about in his instructions is that the diaphragms need to be "pre-loaded" before screwing down the fuel and air bodies.
If the fuel casting screws are tightened while the diaphragm assemble is relaxed, it will tend to get stretched (when put into service) to the point of elongating the screw holes in it, and eventually the material will fail causing a leak. This is more important on the fuel side than on the vacuum side.
To "pre-load" the diaphragm, you want the assembly (rocker arm) pulled down as far as it will go before tightening the screws. On the vacuum side you only want to bring the arm far enough to see the diaphragm material flatten out between the two castings before tightening the screws.
When I get some time, I will put together a how-to, as I took photos during the entire process.
The first photo is my son, David. This shows him screwing the fuel assembly together BEFORE we realized that we needed to "pre-load" the assembly, which involves the use of a bench vise and two sets of hands.
Attach file:
(60.49 KB)
(61.83 KB)
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