aLmk's Turbo FA5

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Originally Posted by Si Speed 317

Nice, best of luck with Tial. I would say big washer first, then the smaller ones. Doesn't really matter. What does matter is that it doeant leak, the washers won't help with that. You need a thread sealant, something that wont diminish when the gate gets super hot. Gasoila is good, I used it for my fuel/oil lines but it doesn't lock like the blue or red sealant (I forget the name of those, threadlock?). So, I would use a good sealant. Teflon may work, but you're gonna have to load it up because of the taper on the gate threads. Thats why I suggested a liquid, it'll make a nice seal. Just make one straight bead around a thread or two, or use a liquid teflon and go over a lot of threads. Let me know what you come up with

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The gate threads are not tapered. You are not supposed to use thread sealant on them. After some discussion on 8th I am going to try the 3 washers as seen in the last picture. The fitting tightened down nicely I think it will work.

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Originally Posted by aLmk

The bottom fittings are a little different, after the threaded portion it appears the diameter of the hole gets slightly smaller so I cannot thread my fitting in far enough to get a seal...

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My bad, I assumed you meant tapered but its the non-threaded portion.

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Originally Posted by aLmk

The gate threads are not tapered. You are not supposed to use thread sealant on them. After some discussion on 8th I am going to try the 3 washers as seen in the last picture. The fitting tightened down nicely I think it will work.

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You're not supposed to but you can without an issue. Better safe than sorry IMO.

Just to let you know, none of the threads on the Tial MVR or MVS gates is tapered. You can thread in 1/8 NPT, but that is not the correct thread pitch, it can damage the threads, and in my case I think is the reason my gate ended up leaking. The previous owner used 1/8NPT to AN fittings on the gate and now the gate leaks where the 2 actuator halves mate, but right by the fittings. Bill is suspecting that threading the NPT fittings in too tight could have caused a small crack which is now causing the leak. And as for using thread sealant on non tapered fittings, this came from my build thread on 8th:

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Originally Posted by mucter

And either way, thread sealant won't help at all. Trust me, I've been there, done that. On a non tapered thread, it doesn't do jack squat. Thread sealant creates an air/liquid tight seal by being pressurized into place by the threads. Without that pressure, it won't do anything. The washers are what seal it. If that fitting won't seal with those washers, he needs to use a different fitting.

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Originally Posted by aLmk

Just to let you know, none of the threads on the Tial MVR or MVS gates is tapered. You can thread in 1/8 NPT, but that is not the correct thread pitch, it can damage the threads, and in my case I think is the reason my gate ended up leaking. The previous owner used 1/8NPT to AN fittings on the gate and now the gate leaks where the 2 actuator halves mate, but right by the fittings. Bill is suspecting that threading the NPT fittings in too tight could have caused a small crack which is now causing the leak. And as for using thread sealant on non tapered fittings, this came from my build thread on 8th:

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Interesting. My thought process is that the sealant creates a 'seal' so no gas or liquid can escape. Don't see why it wouldn't work. I guess we'll see how it goes, one way to find out! If you want the washers to work, I would use crush washers vs regular washers. That would make a difference in my mind, but who knows. [MENTION=28]Spaz[/MENTION] [MENTION=56]Adm_rsx[/MENTION]

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Originally Posted by Si Speed 317

Interesting. My thought process is that the sealant creates a 'seal' so no gas or liquid can escape. Don't see why it wouldn't work. I guess we'll see how it goes, one way to find out! If you want the washers to work, I would use crush washers vs regular washers. That would make a difference in my mind, but who knows. [MENTION=28]Spaz[/MENTION] [MENTION=56]Adm_rsx[/MENTION]

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Yes it does create a seal, but it creates a seal because it becomes pressurized because of the taper. As you thread the NPT fitting in, its diameter is slightly increasing so it starts slowly adding pressure, that's why you can never 'fully' tighten NPT fittings. And I am using crush washers. The M10x1.0 to 4AN fittings came with a crush washer to seal for liquid/air and the 2 additional washers I used on the bottom fitting are from the banjo bolt fittings that came with the wastegate. When I get home from class tonight I am going to install it and we will know for sure if it works! I hope it does because I really don't want to take it out again, and I really don't want to use rubber lines with the banjo fittings.

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Originally Posted by aLmk

Yes it does create a seal, but it creates a seal because it becomes pressurized because of the taper. As you thread the NPT fitting in, its diameter is slightly increasing so it starts slowly adding pressure, that's why you can never 'fully' tighten NPT fittings. And I am using crush washers. The M10x1.0 to 4AN fittings came with a crush washer to seal for liquid/air and the 2 additional washers I used on the bottom fitting are from the banjo bolt fittings that came with the wastegate. When I get home from class tonight I am going to install it and we will know for sure if it works! I hope it does because I really don't want to take it out again, and I really don't want to use rubber lines with the banjo fittings.

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Of course. Well, best of luck. Keep us updated on how it works out!

Can you just cut off a portion of the threads to make it shorter?

Oh man that's crazy! Glad you found it!

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Originally Posted by Adm_rsx

Can you just cut off a portion of the threads to make it shorter?

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I suppose I could. Don't I risk it not being able to thread in after doing that? Don't mean to ask a stupid question but I really don't know.

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Originally Posted by aLmk

I suppose I could. Don't I risk it not being able to thread in after doing that? Don't mean to ask a stupid question but I really don't know.

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Just make sure you do a clean cut with a dremel. I do it on a daily basis at work and its just fine as long as you take your time.