Fuel pump rod - what is the purpose of umbrella? I need to replace the fuel pump rod and bushing according to my machinist due to wear as he has started the ré build (C69). I understand there are two different lengths depending on whether the intake is aluminum or steel, but what purpose does the "umbrella" serve? I'm assuming it diverts oil from splashing upwards, but he said it helps to "pump" air as part of the crankcase ventilation system which I still haven't fully grasped?
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Re: Fuel pump rod - what is the purpose of umbrella? I'd never heard of the "air pump" theory before.
I find that interesting in a humorous way :) Keeping the oil down was in fact the primary reason that shield was in place. |
Re: Fuel pump rod - what is the purpose of umbrella? Hmmmm . . . as it moves about .200 of an inch, I doubt that it pumps much air! Given the cubic inches of the engine and the amount of air that the road-draft system most likely moves . . . can't imagine it doing anything. Probably just another "flathead urban myth"! LOL
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Re: Fuel pump rod - what is the purpose of umbrella? And... the pushrod length is determined by the manifold, not what it's made of. Your original intake, be it aluminum or iron, uses the longer pushrod.
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Re: Fuel pump rod - what is the purpose of umbrella? I was going to say it feeds oil into the mechanism of the pump as you fill it but I think its more likely to stop water running down and freezing the push rod,
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Re: Fuel pump rod - what is the purpose of umbrella? Keeps down the upward splash of oil out the breather.
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Re: Fuel pump rod - what is the purpose of umbrella? Sometimes thinking, can get get over thonk.
Sometimes over thonking is thinking. This time we over thonk. :) |
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Re: Fuel pump rod - what is the purpose of umbrella? As an engineer it might be easy or simply confusing. Everything had a purpose, simple or other. First time I saw a cotter pin in a oil pan I cursed and said what sh!t is this. Till I found out it had a factory purpose. Not sure there is a part number though. Internet searches are problematic... :rolleyes:
On the 59a with a offy aluminum I believe you need the short rod. . |
Re: Fuel pump rod - what is the purpose of umbrella? I thought I would give an update, as I purchased two new ones from Speedway. One of for the cast intake and the other was for the aluminum intake. Here are the observations from the machinist:
1. Both were CAD plated which caused interference with the brass bushing I also purchased from Speedway. The machinist had to remove the plating for them to fit. 2. Both are warped along the axis (Guessing by 0.050" to 0.100"). This is likely due to the fact that the "umbrella" was TIG welded around the complete rod circumference which is totally unnecessary. The original "umbrella" was just spot welded in one area. 3. The overall length of the new long version was actually longer (about 3/16") than the stock one I had. We didn't measure anything to see what was right/wrong. Also, the length below the the "umbrella" on the new long version was shorther than the stock version. I'm very disappointed in the quality issues and will speak with Speedway when I have a chance. It's not a lot of money we are talking about, but it is the pain in the a$$ factor. It's truly amazing that they could build something like this 70 years ago that still remains as a viable part, and the stuff produced today is total garbage = offshore. Wishing this kind of manufacturing would return to NA... |
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The push rod is in fact determined by the intake. However, FACTORY aluminum intakes required a push rod that was approximately 1" shorter than the FACTORY cast iron intake required. |
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In the future look for genuine NOS or gently used Ford parts. A phone call to Third Gen Automotive would have yielded you a genuine Ford fuel pump push rod or placing a want ad here would have worked with great results. Speedway = Garbage. |
Re: Fuel pump rod - what is the purpose of umbrella? It depends on the part, Speedway sells a lot of quality parts, but they also sell cheap repro parts as well (as do a lot of suppliers). You have to pay attention to what is what when purchasing.
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Re: Fuel pump rod - what is the purpose of umbrella? I agree that not e everything they sell is garbage, and understand that it is almost impossible to monitor supplier quality on the scale they deal with. I'm hoping though they will take issues with qualities back to their suppliers as they arise like any good company.
It really is too bad that we were conned into believing moving our manufacturing offshore was going to somehow be better for us as consumers. In reality, quality went south, and millions of good paying jobs for the middle class were wiped out. Rant over... |
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Re: Fuel pump rod - what is the purpose of umbrella? My take is.. If my machinist told me the umbrella on my push rod was there to pump air.. I would worry I had the wrong machinist.
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Re: Fuel pump rod - what is the purpose of umbrella? The Chinese can make a part to exact requests. Not always requested and corners are curbed for manufacturing speed and cost. and sometimes you don't get what you order... sometimes the left arm doesn't know what the right arm is doing also.
Not sure if there would be a issue with environmentally manufacturing these state side as it's really just bar stock milled. We mill barrels fast enough. But you would have to sell a ton of them to make it worth while. Thanks for the update!!! Luckily something like this part is very available as a bunch of guys have blocks cracked or other sitting there with them in them. There is probably a guy somewhere with a 5gal bucket full of them. Most likely they will fix correct, but not sure about true-ness to .050. Think the umbrellas where pressed on originally, it would have been easier to press them in on a jig, then spot weld everyone produced. But I could be wrong (kube or others can comment on that). 19fordy was the only guy to answer your question on the purpose. . |
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