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DT400 series injector nut dimensions?


Dax DeCelle
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Anyone know the diameter and thread numbers for DT400 series injectors? I need to make a puller. I know Hy Capacity sells one, but I’d like to make my own with stuff on hand. Just can’t find a nut to fit. 

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6 minutes ago, Dax DeCelle said:

Anyone know the diameter and thread numbers for DT400 series injectors? I need to make a puller. I know Hy Capacity sells one, but I’d like to make my own with stuff on hand. Just can’t find a nut to fit. 

I made one and I think 9/16 fine thread. This should be the same as some old lug nuts but don’t quote me on size or threads. I know I found a nut in our collection of crap and welded it to a pipe couple that fit our bid slam hammer 

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threads where the injection line screw on are 14mm X 1.5.

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1 hour ago, Injpumped said:

threads where the injection line screw on are 14mm X 1.5.

That’s the ticket. I knew it was a lug nut I made it out of.  Long time ago though. We always had all sizes of metric , standard stuff we would squirrel away if you needed something.

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Old injection line works well as a source for parts. The one I made I just took a 1 1/2 shaft drill hole slightly larger than the line and brazed a steel ball on the top of the line. Made a pretty good puller.

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11 hours ago, IHC_1470 said:

Old injection line works well as a source for parts. The one I made I just took a 1 1/2 shaft drill hole slightly larger than the line and brazed a steel ball on the top of the line. Made a pretty good puller.

We did the same, took a junk line, cut it, took the nut, and welded another nut to it to fit the slide hammer, works great for the stubborn nozzles!

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I use an old inj line nut, and tap the area the line passes through to 3/8 coarse, and it screws right on my little slide hammer. More force needed, then the big slide hammer is needed which will require a larger nut welded to the old inj line nut. 

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16 minutes ago, Injpumped said:

I use an old inj line nut, and tap the area the line passes through to 3/8 coarse, and it screws right on my little slide hammer. More force needed, then the big slide hammer is needed which will require a larger nut welded to the old inj line nut. 

With the big slide hammer a couple knocks brass tube and all come out. If injector is needed just cut open tube. Thanks for the info I know I made a puller out of lug nut. Now if I look I bet we have one for 361 and 400 series. Had them made to use on slide hammer and to use as a pulled under fuel tank.

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Well what a way to waste a day. So I was determined to make a puller with stuff on hand. I don’t have any lug nuts with that thread pattern, or extra injector nuts, but in my search, I came across a junk switch with an interesting nut on it. It was the perfect fit on the injectors. CE8F6FD9-880C-4DBD-A5BA-C5CDB1296FA3.thumb.jpeg.1e3471012c33b77cd494e37c7787e005.jpeg9014CAC6-ADE9-42E0-BA28-685D53D089B1.thumb.jpeg.a540bc41b4a8bd2ace4aea50cd7b2846.jpegI started with that and set out to make my version on the Hy Capacity puller. I used this nut, a 3/8” carriage bolt, some washers, and a section of 1-1/2” fence rail. It’s what I had on hand. B8BE91FD-7824-4E26-B98B-93D0B225F5A1.thumb.jpeg.b216310b1e43951e10724a20a8099174.jpeg
B67D1112-1702-4A4E-9858-1B2DEBE3F898.thumb.jpeg.be9de4c32285cd3b711b427abfb90f47.jpeg5BA71412-044D-429A-988D-CD3261CE961D.thumb.jpeg.5b7560d6cc0f9d9a2eaada7a40862ca8.jpeg39A0B191-CD1E-48D3-B2E2-E2942B595E2F.thumb.jpeg.9f1df237473b1387482a5e59778bef72.jpegThe problem was that I knew none of it would stand up to serious torque, but it’s what I had. 7554E5A5-C42D-462A-9EF9-928F939FF4AB.thumb.jpeg.e92522c7944619d0cf524c8665704618.jpegA0E86C12-A6E1-4BFA-A138-0656D0BDA0E2.thumb.jpeg.0e3ca78d3d14a1cf11cbc550587fd839.jpegIt pulled 3 injectors before things started failing. Those injectors are really stuck. I pulled 1, 5, & 6. The other three are giving me a serious fight. I even tried the pulling nut in the slide hammer. I just wore a hole in my hand with that. I went back to the puller and stripped two sections of threads on the pulling bolt. 
I’m going to find a nut with those threads and build something more substantial. I can’t believe how stuck these injectors are. 483E3A50-9E2C-4ECD-B6EC-C6B33B1B4842.thumb.jpeg.8e9ed84041df8606b2d75d7c68727e75.jpeg

 

 

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I shouldn't admit this, but I never had any problems pulling those injectors by simply taking the bolt out of the hold down clip, leaving the clip in place, and using a small prybar under the clip right slid right up to the injector.   I had a few where we needed a small wedge/bar on both sides of the clip.   Y'all tell me if "this is a terrible idea because ...." so I can stop doing it please (I'm being serious).

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13 minutes ago, Jeff-C-IL said:

I shouldn't admit this, but I never had any problems pulling those injectors by simply taking the bolt out of the hold down clip, leaving the clip in place, and using a small prybar under the clip right slid right up to the injector.   I had a few where we needed a small wedge/bar on both sides of the clip.   Y'all tell me if "this is a terrible idea because ...." so I can stop doing it please (I'm being serious).

Did this many times also. The nut welded onto a big slide hammer works best to remove any of them.

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Version 2.0 has failed. These injectors are very, very stuck. The pulling nut pulled the threads and seized. I guess I’ll try a 1/2” pulling bolt next. 8AC81878-1644-4988-8A7C-1A211CBFE045.thumb.jpeg.c69762c7965b74eccf97cb849c7e873f.jpeg0EAAB0F8-95DD-4EF0-AD47-52CFC54A4E81.thumb.jpeg.46b24d0ec783e5a1cbda89a2c80ee145.jpeg

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A closer look says the washer was to soft as well. Lube does make a big difference with pullers. I use gl5 on threads and moly disulfide on thrust surfaces. I have harbor freight pullers I've used for years with impacts. Always use ep lube.

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If they are coming that hard I hope you have the coolant drained. Time for the pick and get the rubber umbrella out of the head so you can get some penetrating oil soaking in there if you have not all ready done it. Make you slot a little wider or cut one on the other side. Get it under pressure and that take an air hammer and small punch and jar the nozzle. It may help break it loose especially if you let it soak a day or so. 

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A wheel stud nut from an 88-98 Chevy pickup will screw on an injector from 400 series engines.  I welded a bolt to the nut and used my slide hammer vise grips.  Have removed three sets so far.

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