Re: Whiskey Tango Foxtrot, what is it?
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Home away from home
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If your talking about the air flow tube. It was put there to direct air in to the oil filler cap. To help circular the gases out of the block. The picture I have attached show where someone had bent it out of the way of the oil filter and now it does no good for directing the air to the oil fill cap.
If this is what your talking about. Wes
Posted on: 2016/10/16 14:42
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Re: Whiskey Tango Foxtrot, what is it?
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Forum Ambassador
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The tube was one of the steps in a long process Packard went thru to try and prevent valves from sticking when guides rusted in sitting engines. That included varying length oil fill tubes, & different shaped caps to avoid turbulence and a kind of suction effect at road speed from air flowing around the oil filter canister. They finally added the air vent tube. Its purpose was to provide a rudimentary forced ventilation from the fan to feed thru the filler cap into the crankcase in another effort to prevent condensation from forming. It was mostly useful when long periods of idling or slow travel was an issue and normal speed was not able to draw air thru via the regular suction of the crankcase vent. Was only used on the 356 engine. That particular item is discussed in Service Letter Vol 15 #3 of Feb 1, 1941.
Posted on: 2016/10/16 15:09
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Howard
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Re: Whiskey Tango Foxtrot, what is it?
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Home away from home
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That's the one, and it makes good sense too. It only has the roaddraft tube to expell crankcase pressure, or indeed create a depression in there (an excellent condition). Moving air will siphon itself after a short time, the hotter it gets the faster it moves/siphons. Thank you, and I can see, and frankly hear, what it's like without it. My engine has a minor blubber out of the fill tube when it's cold. Almost sounds like a knock but it's bubbly in nature, not at all mechanical. It also vents out of the fill at low/idle speeds once warm too. Now I need to find one to copy (looks easy to make). Drs Watson I presume? Thank you much...
Posted on: 2016/10/16 15:17
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Re: Whiskey Tango Foxtrot, what is it?
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Forum Ambassador
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It is not hard to make a reasonable facsimile. I made a modified version when I added an AC compressor on the L side of my 47 engine where Packard moved the compressors on prewar Clippers. I have no idea what Packard did to the tube and oil filter when moving the compressor but I chose to relocate them slightly downward and needed a lower tube to go under the bracket. Without the oil filter in the air path it may not have been necessary but the compressor bracket does block a bit of air so figured it wouldn't hurt to keep the tube.
Finding the 1 5/16 ID of the tube Packard used was difficult. I used one close but not quite the same. Don't remember the size offhand and can't remember if it was a thin wall exhaust tubing from parts store or electrical conduit. Straps were ordinary steel flat bar from the hardware store 1 wide x 1/8 thick. The legs are 1" wide and 8" long. Approx 1/2" at the end is bent and curved to weld to tube and the remaining length is bent in a couple of places. The main bend is 4" from the end of strap and is approx 30 degrees. A smaller bend is about midway between the tube and main bend with an angle as needed to match the vent slot in the cap. The slot is sized for a 3/8 bolt and is 1" long. Here are dimensions of the original next to the one I built. Mine has shorter legs, different bend and narrower slot.
Posted on: 2016/10/16 16:10
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Howard
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Re: Whiskey Tango Foxtrot, what is it?
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Home away from home
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I hope the engineer who came up with this idea to fix the problem, received a raise or at least a bonus.
Posted on: 2016/10/16 21:18
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"I have a great memory for forgetting things"
Lee Chan |
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Re: Whiskey Tango Foxtrot, what is it?
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Home away from home
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The picture and dimensions are an awesome aid for this. Very grateful for the help. Some .030 wall 1 3/8 tube will be just right. Tube is O/D, pipe is I/D. 1 3/8 is like snowmobile exhaust tube, and imagine that, I have some from my sled exploits. I'll share the journey folks, thank you again.
Posted on: 2016/10/17 8:41
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Re: Whiskey Tango Foxtrot, what is it?
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Forum Ambassador
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Just realized I forgot to include a dimension. The rear strap is positioned about 1/8" from the end of tube and inside to inside distance between them is just over 3 1/4". Since the slots have to fit over the oil filter mounting studs that one probably wouldn't be too hard to figure out but here it is anyway.
Posted on: 2016/10/17 9:11
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Howard
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Re: Whiskey Tango Foxtrot, what is it?
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Home away from home
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I have one extra....free to good home. PM me
Posted on: 2016/10/17 10:40
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Where principles are involved, be deaf to expediency. (Matthew Fontaine Maury 18th century oceanographer)
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Re: Whiskey Tango Foxtrot, what is it?
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Home away from home
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In process of rebuilding my 2126. had a spare and prepped them both since I was set up. Both have been wire brushed, treated with Permatex Rust Treatment and then sprayed with SEM self etching primer while the Permatex was still "green". Ready to paint and install. As a side note, I think ( and might be corrected here) that it is important to position the oil cap with slot facing tube to assure air entry is maximized.
Posted on: 2016/10/17 10:58
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Where principles are involved, be deaf to expediency. (Matthew Fontaine Maury 18th century oceanographer)
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