#2 injector dust seal pops off from diesel smoke - Dodge Cummins Diesel Forum
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post #1 of 5 (permalink) Old 04-06-2019, 10:18 AM Thread Starter
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#2 injector dust seal pops off from diesel smoke

I’ve heard a tick near the front of the engine since I started running the truck in September. Then in October, I changed the injectors and turbo. I noticed after bleeding the injectors that the tick was coming from near the front of the engine. I also installed new dust seals for the injectors. After bleeding the injectors and running the truck, I noticed the dust seal had popped off on the #2 cylinder. I worked the seal back in and drove again. After I stopped the truck, dust seal #2 had popped off again. I decided to forget it and not worry about it. I drove the truck for about 1,000 miles or so, and when I recently opened the hood, there was diesel soot around the #2 injector. The injector is seated all the way down, and the injector nut is within 1/16” of the head, and I checked to make sure it was seated right. The other injectors are seated all the way down and don’t get diesel exhaust by them. I also recently drove the truck the week before last and it seemed to have less power than normal. Would this be a valve problem if the diesel exhaust is getting by the injector, or what else could be the problem?


98 Civic DX coupe 5sp 1.6L 158kmi; 95 Cummins 2500 4wd 5sp 299kmi($12k-13k total investment just to run/drive decent, more $$ for optimal condition); For Sale 03 Suzuki Katana 600 11kmi; 97 F150 5spd v6 4wd about 210kmi (yard truck)
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post #2 of 5 (permalink) Old 04-06-2019, 11:31 AM
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I've never seen diesel exhaust come around a loose injector hold down nut, always wet from fuel. With the engine idling crack open the injector nut to see if the idle changes.

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post #3 of 5 (permalink) Old 04-06-2019, 03:30 PM
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Quote:
Originally Posted by jserman35 View Post
The injector is seated all the way down........
It might be seated but the copper gasket is leaking. The dust seal is just that, a seal that keeps dust from settling in the injector hole. To fix it you need to remover the injector, make sure the surface in the head is clean and smooth, then replace the copper gasket

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post #4 of 5 (permalink) Old 04-07-2019, 08:32 AM Thread Starter
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Thanks for the info. I thought I might have to pull the injector to reseat the seal, but wasn’t sure.

98 Civic DX coupe 5sp 1.6L 158kmi; 95 Cummins 2500 4wd 5sp 299kmi($12k-13k total investment just to run/drive decent, more $$ for optimal condition); For Sale 03 Suzuki Katana 600 11kmi; 97 F150 5spd v6 4wd about 210kmi (yard truck)
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post #5 of 5 (permalink) Old 04-07-2019, 09:27 AM
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The dust seal can be discarded. It doesn't retain either fuel or compression, so it's condition is irrelevant.

97 3500, 2 WD, G56, slightly bombed, 1.3 million miles. Started the second million on 8/24/13
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