 Fuel Injector Seals |
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| Shredhead |
 Dec 8 2023, 01:20 PM
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#1
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Member  Group: Members Posts: 112 Joined: 10-August 15 From: CT Member No.: 19,047 Region Association: North East States  |
A couple of injectors failed (leaking) on my 1974 2.0 Djet. I'm assuming they are original as they are green. I know I can ship them off to be restored if possible, but I think they are probably toast and so in the meantime I've bought new Standard Motor FJ67's and will install those. I realize the new injectors take an inner and outer seal. My question is, did the original injectors have two seals also? Only one outer seal come out with the first offending injector I pulled, so I'm wondering if the other is still seated in the hole? Have a borescope coming so I'll take a look, but curious in the meantime, hence this post.
Kevin |
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| rjames |
Dec 8 2023, 01:26 PM
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#2
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I'm made of metal Group: Members Posts: 4,176 Joined: 24-July 05 From: Shoreline, WA Member No.: 4,467 Region Association: Pacific Northwest 
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Originals also had an inner and outer seal.
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| 914Sixer |
Dec 8 2023, 01:28 PM
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#3
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914 Guru Group: Members Posts: 9,045 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region
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Yep, probably in the hole
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| Dave_Darling |
Dec 9 2023, 01:08 PM
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#4
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914 Idiot Group: Members Posts: 15,080 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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The injectors have two seals. One, the "inner seal", goes around the end of the injector where it fits into the recess in the intake runner pipe. The other, the "outer seal", doesn't seal anything. It fits around the injector and provides a shoulder for the mounting ring for the injector to seat on.
If I've done this right, this should show an injector with both seals on it: (IMG:http://www.914world.com/bbs2/uploads_offsite/eadn-wc01-11639375.nxedge.io-121-1702148913.1.jpg) This shows the mounting ring or clamp or whatever you want to call it: (IMG:http://www.914world.com/bbs2/uploads_offsite/i.ebayimg.com-121-1702148914.2.png) The outer seal fits into the middle of the ring there, and the clamp is held onto the intake runner pipe with an M6 (10mm wrench size) nut. My speculation is that this holds the injector in place but provides a bit of cushioning against the vibration of the engine, helping to prolong the life of the pintle valve and electronics inside the injector. --DD |
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| Shredhead |
Dec 10 2023, 08:52 PM
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#5
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Member Group: Members Posts: 112 Joined: 10-August 15 From: CT Member No.: 19,047 Region Association: North East States |
Thanks guys. Guess I'll be going fishing. (IMG:style_emoticons/default/biggrin.gif)
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