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66brm Samba Member
Joined: January 25, 2010 Posts: 3676 Location: Perth Western Australia
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Posted: Thu Oct 07, 2021 2:04 am Post subject: Re: Full flow fittings |
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From experience, after fitting the fitting to the cover (before installing) run the cover on some fine wet and dry on a glass pane. The screwing of the fitting and tightening will warp an aluminium cover and cause potential leaks _________________ Aust. RHD 66 Type 1
Aust. RHD 57 Type 1 Oval
modok wrote: |
I am an expert at fitting things in holes, been doing it a long time |
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oprn Samba Member
Joined: November 13, 2016 Posts: 12632 Location: Western Canada
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Posted: Thu Oct 07, 2021 4:50 am Post subject: Re: Full flow fittings |
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In my experiance pipe fittings are often over tightened badly. Whenever I see a fitting buried to the last thread I just shake my head! I have seen far too many fittings tightened until the aluminum cracks or the threads gall. All they really need is to be tight enough to not leak. With quality fittings and holes threaded with a good tap I have seen hand tight fitting take 1000 psi and not leak. Obviously you wouldn't run them that way, just saying...
Cheap fittings and poor tapping will often leak no matter how tight they are. _________________ We had the stone age, the bronze age, the industrial age and now we are in the age of mass deception and mind control for corporate profit. (The mass media age) |
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Dale M. Samba Member
Joined: April 12, 2006 Posts: 20365 Location: Just a tiny bit west of Yosemite Valley
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Posted: Thu Oct 07, 2021 5:19 am Post subject: Re: Full flow fittings |
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Reviewing all the comments and pictures, If it were me I would remove oil pump cover and get new fitting and start over .. By this I mean fitting oil line fitting to pump cover on work bench and see if it really needs to be modified for flow.... Also as someone mentioned check for any distortion of pump/cover mating surface to pump body...
And now you are exposing pump cover to more forces by trying to screw in larger portion (diameter) of taper fitting in effort to seal and probably next series of post will be "how come my pump cover cracked"....
By looking at pics I see about 7 thread in pump cover plate and you are only engaging about 6 threads (of 10) of AN fitting into pump cover, basically you probably ruined a expensive fitting for no reason... _________________ “Fear The Government That Wants To Take Your Guns" - Thomas Jefferson.
"Kellison Sand Piper Roadster" For Street & Show.
"Joe Pody Sandrover" Buggy with 2180 for Autocross (Sold)
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All suggestions and advice are purely my own opinion. You are free to ignore them if you wish ... |
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AZOffTheWall Samba Member
Joined: December 27, 2012 Posts: 209 Location: Arizona
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boondocksdrew Samba Member
Joined: April 10, 2017 Posts: 258 Location: Charlotte, NC
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Posted: Thu Oct 07, 2021 11:37 am Post subject: Re: Full flow fittings |
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More trouble than it was worth but the -10 90 degree has been accomodated.
On the oil pump cover when I thread a new uncut fitting in to hand tight I don't have any interference, but "by the book" even the full length fitting doesn't thread in far enough. If it's supposed to thread in to depth thats equal to its diameter that would have it going in all the way flush to the hex portion. There are 15mm of threads. At hand tight I have 9mm inside and 6mm left outside. Opinions on whether I can trust that or if I need to take a tap to it so I can thread deeper?
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Starbucket Samba Member
Joined: April 30, 2007 Posts: 4006 Location: WA
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Posted: Thu Oct 07, 2021 11:49 am Post subject: Re: Full flow fittings |
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Those fittings are for hydraulic hoses designed to hold thousands of PSI and that's what the "Book" specs are for, the cut fitting will be fine at your 60 +/- 30 PSI. |
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evanfrucht Samba Member
Joined: July 24, 2016 Posts: 2180 Location: Laurel Canyon, CA
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Posted: Thu Oct 07, 2021 12:05 pm Post subject: Re: Full flow fittings |
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Yep, you're good. It doesn't need to sit flush... That's more of a nitpicky aesthetic detail.
Throw the cut fitting away. _________________ 1967 Bug ( the daily rod )
1964 Fury Wagon ( the pavement shredder ) |
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Dale M. Samba Member
Joined: April 12, 2006 Posts: 20365 Location: Just a tiny bit west of Yosemite Valley
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Posted: Thu Oct 07, 2021 1:39 pm Post subject: Re: Full flow fittings |
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About tapered threads, they don't always go all the way, the are tapered so when they get tight via taper and it seals the threads by friction fit, trying to seat fitting fully with no thread showing will only damage both fitting and oil pump cover and again everything is compromised.... Taper (NPT) only need to be tightened enough to seal...
Lots of details here on how NPT threads "work"...
https://en.wikipedia.org/wiki/National_pipe_thread _________________ “Fear The Government That Wants To Take Your Guns" - Thomas Jefferson.
"Kellison Sand Piper Roadster" For Street & Show.
"Joe Pody Sandrover" Buggy with 2180 for Autocross (Sold)
============================================================
All suggestions and advice are purely my own opinion. You are free to ignore them if you wish ... |
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chrisflstf Samba Member
Joined: February 10, 2004 Posts: 3413 Location: San Diego
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Posted: Thu Oct 07, 2021 2:29 pm Post subject: Re: Full flow fittings |
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Tapered pipe thread fittings - NPT - arent always consistent from supplier to supplier. Ive had them be tight after 2nd turn, some the opposite. Tapping the hole deeper can help putting the fitting in further sometimes, if necessary |
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boondocksdrew Samba Member
Joined: April 10, 2017 Posts: 258 Location: Charlotte, NC
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Posted: Fri Nov 26, 2021 10:44 pm Post subject: Re: Full flow fittings |
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Should be all plumbed in now. |
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BFB Samba Member
Joined: November 03, 2014 Posts: 1689
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Posted: Sat Nov 27, 2021 8:22 am Post subject: Re: Full flow fittings |
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I had an old machinist buddy tell me that " a bolt only needs to be threaded in as deep as it's diameter ..." years ago, but it was in reference to the strength of that bolt and I don't think that applies to npt as it's not a " structural " component.
sure it has to hold pressure but your not bolting things together with npt _________________ Forced induction can overcome a lot of obsticles that gets in it's way
"You are the Engineer and the Mechanic.
Build it your way not the way someone else does it. Their way might not work for you." - clonebug
An interesting thing happens in forums where everyone starts parroting the same thing and "common knowledge" takes over.
“ The monkey see monkey do mentality seems to run deep in VW people. "Gene Berg said it was so 30 years ago so thats the way it is" “ - bdkw1 |
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Nightshift Samba Member
Joined: December 31, 2019 Posts: 222
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