Q: What's the threading on the female bung on my passenger side 5.0 exhaust manifold? - TCCoA Forums

 
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post #1 of 8 (permalink) Old 07-17-2014, 12:30 PM Thread Starter
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Q: What's the threading on the female bung on my passenger side 5.0 exhaust manifold?

I think this is the where the EGR or the smog pump connected to the exhaust manifold but I'm not 100% sure since it's been quite a while since I had a complete smog-legal tbird in my possession to review.

For the 5.0 engine currently in my track car, I took whatever pipe was there on the donor car, cut it down, and welded a cap onto it.

For my backup engine, I think I sold the matching pipe to someone so I have nothing that fits that bung perfectly.

Please let me know what I'm looking for to block off this port.

I've tried a 1/2" NPT plug and it's just a hair too small in diameter.
It may work if I make a copper gasket from scrap
copper wire beaten flat + seal it with copper RTV but that's not the ideal solution. That will be my backup plan unless you guys can steer me in the right direction.

Thanks in advance for your reply.
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-g

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post #2 of 8 (permalink) Old 07-17-2014, 06:02 PM
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Quote:
Originally Posted by Rayo View Post
I just happen to have an 5.0 MN12 EGR Pipe here.. I measured the end that threads into the Passenger Side header..It comes out to roughly .85 inches which translates to 1/2-14 NPT..In this case since it's getting threaded into a hole..You need a 1/2" MNPT Pipe Plug..I like this style with the hex head:


This one should work nicely-->>1/2" MNPT Pipe Plug

Rayo..
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Originally Posted by S4gunn View Post
I've tried a 1/2" NPT plug and it's just a hair too small in diameter.
Yeap.
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post #3 of 8 (permalink) Old 07-17-2014, 06:54 PM
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plug

Hello

I used the 1/2" pipe plug, & had it welded in.


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post #4 of 8 (permalink) Old 03-27-2017, 07:04 PM Thread Starter
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So I lost one of my Smog bung plugs in my last lemons race so I need to cap one/both of them again.
My last bungs were made from the stock Smog pipe (cut down and plugged).

Q: Does anyone have the proper threading for these parts? If not, I'll do what paul suggests by plug and welding it on.

Right not, the spare bung plug is shoved in and tack welded on. I'm sure the threads are all screwed up by now.

I'd rather not pull the exhaust manifold off the car (it's wrapped all nicely) but I guess I'll have to do so.

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post #5 of 8 (permalink) Old 03-27-2017, 08:14 PM
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Quote:
Originally Posted by S4gunn View Post
So I lost one of my Smog bung plugs in my last lemons race so I need to cap one/both of them again.
My last bungs were made from the stock Smog pipe (cut down and plugged).

Q: Does anyone have the proper threading for these parts? If not, I'll do what paul suggests by plug and welding it on.

Right not, the spare bung plug is shoved in and tack welded on. I'm sure the threads are all screwed up by now.

I'd rather not pull the exhaust manifold off the car (it's wrapped all nicely) but I guess I'll have to do so.

-g
For some reason, I just spent a bit laughing uproariously at this completely innocent post.

I heard Beavis reading it to me, and it went downhill from there.

Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
Black '96 Cougar XR-7 (Lazarus) 210k mi PI Intake, '02 4R70W, Jmod, PST DS, GrogTune, Konis, Mark LCA+Poly, racecougar Custom Engine Chain, and JL and racecougar Bracing.
Black '97 Tbird Limited Edition, '02 4R70W, 255 walbro, PST DS, PBR Brakes&SS lines, Toicko Blues & Springs, GrogTune.

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post #6 of 8 (permalink) Old 04-12-2017, 09:20 AM
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EGR Pipe Delete

I deleted my entire EGR system last Summer..What I found was kind of interesting..
I mean the size of the threads on the female bung on the passenger side 5.0 exhaust manifold..
It turns out, they are pipe thread...Just not American Pipe Thread..British actually..

I didn't know such a thing existed until I started poking around at the hardware store..

Anyways, the size is 5/8-14

I used this one-->>JMF 5/8in Flare Plug (41212)


The way the EGR Pipe is installed is similar to say brake fittings..With the Inverted Flare being how it seals..

Using a Die Grinder..I removed the sleeve that protrudes into the inside of the collector..
I opted to remove mine so the plug would sit further into the bung hole..lol

If you ever planned on reinstalling the EGR Pipe, I would advice against removing that sleeve that protrudes into the inside of the collector..
Otherwise, your pipe won't seal..

Here are the pics:










Rayo..

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post #7 of 8 (permalink) Old 04-12-2017, 12:48 PM Thread Starter
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Ahh, I wish you had posted that last night. I just welded the 1/2" bung in last night.
Oh well. I'll put that 5/8" plug on my shopping list for a spare.

-g

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post #8 of 8 (permalink) Old 04-12-2017, 03:55 PM
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The fittings on the side of the 4r70W are BPST: British Pipe Straight Thread.

Tube threads (tube ends) fit BPST better than NPST, why, IDK. You'd think they'd be NPST.

NPT(M or F) is National Pipe Taper.

Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
Black '96 Cougar XR-7 (Lazarus) 210k mi PI Intake, '02 4R70W, Jmod, PST DS, GrogTune, Konis, Mark LCA+Poly, racecougar Custom Engine Chain, and JL and racecougar Bracing.
Black '97 Tbird Limited Edition, '02 4R70W, 255 walbro, PST DS, PBR Brakes&SS lines, Toicko Blues & Springs, GrogTune.

I'm not Human enough to be human; but I'm trying to fit in, and I'm learning to fake it.

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