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 EGR Thread Size
#560959
01/31/05 05:02 PM
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Joined: Jan 2005
Posts: 19
OP
Need a Spot
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Installing a newer version of the 2.3 4ZD1 engine into my '92 pickup. The newer style head has not been drilled and tapped for the earlier EGR manifold that screws into the head at the exhaust ports. We've drilled it out and are now ready to tap the threads. A 1/2 inch tap is too small. Does anyone know the proper size? Appears to be 20 threads per inch and is tapered (ie, pipe threads)
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 Re: EGR Thread Size
[Re: mph9111]
#560960
01/31/05 10:05 PM
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Joined: Jan 2005
Posts: 19
OP
Need a Spot
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Appears to be a 14mm X 1.25 thread pitch. Think that is the same as the spark plugs. Oh yeah, it's not a tapered thread.
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Re: EGR Thread Size
[Re: mph9111]
#560961
02/01/05 07:40 PM
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Joined: Apr 2000
Posts: 7,268
Isuzu Moderator
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Just for future reference, that is actually called the AIR rail. And yes, you are correct, the thread x pitch is the same as the spark plugs.
Michael
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Re: EGR Thread Size
[Re: mlclark]
#560962
02/01/05 08:28 PM
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Joined: Feb 2000
Posts: 694
Rock Warrior
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That got me thinking... what is the thread size of the EGR tube where it connects to the EGR valve? Looks like somewhere around 19mm.
-Tad
1994 Trooper. 3.2 DOHC/auto. 4.77s,3xARB, OME 919HD springs. 34" Swamper LTBs 2001 Trooper "stock" <img src="/forums/images/graemlins/wink.gif" alt="" /> http://www.planetisuzoo.com
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Re: EGR Thread Size
[Re: Nazrat]
#560963
02/02/05 12:40 AM
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Joined: Apr 2000
Posts: 7,268
Isuzu Moderator
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Tad, I think it is in the 22mm range.
Michael
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Re: EGR Thread Size
[Re: mlclark]
#560964
02/02/05 06:31 AM
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Joined: Aug 1999
Posts: 9,030
4x4Wire.com Managing Editor Emeritus
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I'm recalling that it was a 22m socket, with smaller threads.
Hazy recollection at best, tho.
Randii
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Re: EGR Thread Size
[Re: randii]
#560965
02/02/05 01:42 PM
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Joined: Jun 2004
Posts: 576
Rock Warrior
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Just got done fighting mine <img src="/forums/images/graemlins/shiner.gif" alt="" /> and it took a 22mm wrench to get it off. Madcat <img src="/forums/images/graemlins/kewl.gif" alt="" />
1979 Pontiac Trans-Am - looking 4 a pontiac 455cid
1988 Trooper II - AMC head, .030 overbore, Calmini cam. Toga HV oil pump, Aisins, soon 2 b turbo
1989 Impulse Turbo - Fidanza flywheel, 270cc injectors, turbo-back exhaust, KYBs F/R
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