Quote:
Originally Posted by dsjwilson
78F350, great pics, but the function of each part is a little off. I have used similar push-to-connect fittings for many years at work, this is what each part does-
- the black part (vacuum fitting to manifold) is simply an adapter. One side connects to the engine, the other side is sized to fit into the push-to-connect fitting.
- the light gray fitting (brake booster hose) is the push-to-connect fitting, and that's where all the magic happens. As you pointed out, there is an o-ring on the inside that seals around the vacuum fitting. There are also sprung metal or plastic fingers that retain the mating vacuum fitting in place. If the push-to-connect fitting is working properly, you push until the fitting stops (this action collapses the sprung fingers, and allows the inserted tube/hose to slip inside the o-ring). You then pull straight back to "lock" the sprung fingers in the extended position, keeping the tube/hose from sliding out when there is pressure.
- the dark gray part (clip) is inserted in the gap to ensure that the push-to-connect fitting does not accidentally get pushed downward, potentially releasing the tube/hose.
Hope this is helpful.
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Mr. Wilson, I think that your confusion about my confusion is mostly about the thing that you refer to as "
sprung metal or plastic fingers that retain the mating vacuum fitting in place". I refer to that as the "
black locking ring" that clamps the hose in place and "
sliding ring" with my labels. Hopefully your description will clarify things for anyone who is confused by my labels.
The way I understand your understanding of the parts and their functions is very much the way I understand the parts and the way they function. Except the "light grey fitting (brake booster hose)" is actually white and dirty from years in an engine compartment. It may look grey, but without the dirt, I assure you, that part is white. The "
sprung metal or plastic fingers that retain the mating vacuum fitting in place" is black plastic. It is an integral part of the "
light gray fitting (brake booster hose)" [which is, as I just stated, white], making the part 996.110.170.00 (with option M249) or 986.355.575.06 a black piece of tubing with a white fitting on the end which is secured to it's attachment by a black plastic part with encircling "fingers" that lock in the extended position and an internal o-ring, pictured. Additionally there is; a grey piece that is actually grey (to my eyes a light grey rather than dark), that [in many more words that I used] " is inserted in the gap to ensure that the push-to-connect fitting does not accidentally get pushed downward, potentially releasing the tube/hose." and a black part which serves as a fitting on the right rear intake runner with option 249 (Tiptronic transmission) or left front intake runner (manual transmission). I shall not be appending this into my pictures as labels, but as an addendum I hope that it is enlightening to anyone who was confounded by my simplistic pictures.
Also, in case anyone is confused by your statement about "magic" happening, let me state clearly, There is No Magic used in the manufacture of these cars. It's all a balance of engineering and accounting, weighted towards the accounting.
...seriously though, I think we agree about function and you describe it well.