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Air Injection - Hole Thread? 200

posted by ereuter on Mon Sep 1 07:16 CST 2003
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last visit: Sat Oct 20 15:29 CST 2007

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I'm trying to remove the air injection system from my '76 242. The holes under each of the exhaust ports on the head are threaded, but I can't figure out what the thread is. It seems similar to 1/4" NPT, but not quite. Doesn't seem to match any SAE or metric bolt thread either. Any ideas?

Thanks-
Eric
--
'66 122 Coupe 110k '97 850 Wagon 130k

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Air Injection - Hole Thread? 200

posted by lucid on Mon Sep 1 07:52 CST 2003
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last visit: Fri Oct 24 12:31 CST 2014

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I did the same a few years ago, and believe they were plain old 8x1.25mm like the manifold studs, etc.
--
Bruce Young,
940-NA (current)
'80 GLE V8 (Now gone)
'83 Turbo 245
'73 142 (98K)
'71 144 (track modified--and going to be crushed unless...)
New 144 from '67 to '78
Used '62 122 from '63 to '67

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Air Injection - Hole Thread? 200

posted by lucid on Mon Sep 1 08:45 CST 2003
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last visit: Fri Oct 24 12:31 CST 2014

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Sorry, I now think there was more to it, but don't recall the details (it was '96 when I plugged those holes). Is there just one tapped hole per port? If you describe how the pipe/tube connection is configured, maybe I'll remember something.
--
Bruce Young,
940-NA (current)
'80 GLE V8 (Now gone)
'83 Turbo 245
'73 142 (98K)
'71 144 (track modified--and going to be crushed unless...)
New 144 from '67 to '78
Used '62 122 from '63 to '67

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Air Injection - Hole Thread? 200

posted by ereuter on Mon Sep 1 09:28 CST 2003
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last visit: Sat Oct 20 15:29 CST 2007

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It's a large plug - maybe 3/8" diameter - that is hollowed out. There is a hole drilled across it between the head and the threads. The air comes from a hollow ring that surrounds the plug in this area below the head. Hard to explain, but perhaps that will jog your memory.

Thanks!
Eric
--
'66 122 Coupe 110k '97 850 Wagon 130k

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Air Injection - Hole Thread? 200

posted by lucid on Mon Sep 1 11:27 CST 2003
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last visit: Fri Oct 24 12:31 CST 2014

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"It's a large plug - maybe 3/8" diameter - that is hollowed out. There is a hole drilled across it between the head and the threads.
The air comes from a hollow ring that surrounds the plug in this area below the head. Hard to explain, but perhaps that will jog your memory. "

It doesn't help my memory, but sounds like a "Banjo Fitting". I checked some on hand, and the Banjo Bolt nearest to .375" is about .390 and has a 10 x 1.00mm thread.

A 7/16 x 20 nut will slip over this bolt (replacing the "Banjo"), leaving about 1/4" of bolt thread to screw back in where it came from and make a seal. A thinner nut between 2 crush washers would make it more gas-tight. Am I close?

--
Bruce Young,
940-NA (current)
'80 GLE V8 (Now gone)
'83 Turbo 245
'73 142 (98K)
'71 144 (track modified--and going to be crushed unless...)
New 144 from '67 to '78
Used '62 122 from '63 to '67

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Air Injection - Hole Thread? 200

posted by ereuter on Mon Sep 1 12:29 CST 2003
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last visit: Sat Oct 20 15:29 CST 2007

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That sounds right. I've heard mention of banjo fittings in the past, but never knew what it was exactly. Makes perfect sense.

So, is there a plug I could get with a 10mm x 1.00 thread to just pulg the hole up?

The idea of replacing the banjo with a nut is a good one. I'll do that for now....

Thanks again-
Eric
--
'66 122 Coupe 110k '97 850 Wagon 130k

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Air Injection - Hole Thread? 200

posted by lucid on Mon Sep 1 15:15 CST 2003
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last visit: Fri Oct 24 12:31 CST 2014

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You may find some in places like Ace, True Value, or NAPA, Parts Plus etc. Any place with a Metric Fastener assortment (although the 1.00mm is a "fine" thread, i.e. less common). Hopefully you'll find a bolt you can shorten if necessary. Let me know if you strike out.
--
Bruce Young,
940-NA (current)
'80 GLE V8 (Now gone)
'83 Turbo 245
'73 142 (98K)
'71 144 (track modified--and going to be crushed unless...)
New 144 from '67 to '78
Used '62 122 from '63 to '67

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Testing Email response 200

posted by lucid on Tue Sep 9 23:54 CST 2003
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last visit: Fri Oct 24 12:31 CST 2014

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Email option was not checked for some reason
--
Bruce Young,
940-NA (current)
'80 GLE V8 (Now gone)
'83 Turbo 245
'73 142 (98K)
'71 144 (track modified--and still here)
New 144 from '67 to '78
Used '62 122 from '63 to '67

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Testing Email response again 200

posted by lucid on Wed Sep 10 02:26 CST 2003
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last visit: Fri Oct 24 12:31 CST 2014

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9/10 At 9:20 am. See if I get it email, with OPTION checked on Reply form
--
Bruce Young,
940-NA (current)
'80 GLE V8 (Now gone)
'83 Turbo 245
'73 142 (98K)
'71 144 (track modified--and still here)
New 144 from '67 to '78
Used '62 122 from '63 to '67

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