3406b exhaust temps too high - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 13 (permalink) Old 02-09-2018, 02:50 PM Thread Starter
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3406b exhaust temps too high

Hey All, I have a 3406b (sn 4mg15186) that I recently bought and rebuilt. everything on the truck is stock and has all been gone through. With the only exception that it has or3421 nozzles in it now. It has stock manifold and turbo but my exhaust temps climb way too fast and way too high. I barely give it any throttle and it goes to 1100+. Iím afraid to drive it. My belief is that the fuel screws have been backed out too far by the previous owner bc Itís always had more than normal black smoke but didnít have the heat issue until I put the bigger nozzles in it. I know I should probably just back the fuel off until I get it right but thought someone here might have a more logical answer.

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post #2 of 13 (permalink) Old 02-09-2018, 08:11 PM
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ck your air to air system for leaks, That will cause a sudden increase in both. As to the different nozzles I am not familiar with 3000 series but if they are real big u may have it pinned down. Could be your timing is off? What kind of boost are you seeing? Where is your pyro probe located? I have 580 marine nozzles in my 3zj C model . The screws were backed out to like 10% over spec when I put them in. My power went up a gob and smokes a little more. I dont think I want the screws out any farther for fear of heat.

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post #3 of 13 (permalink) Old 02-09-2018, 08:56 PM Thread Starter
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My pyro probe is after the turbo. The nozzles are the factory nozzles for a 425 hp. Iím not sure how much the screws have been turned out but I know they were messed with by someone before I got the truck. I havenít changed the timing but Iíve checked it and I believe itís right. I feel like Iíve gained 100 hp from this but I didnít gain any boost and my temps sky rocketed which tells me something isnít right

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post #4 of 13 (permalink) Old 02-09-2018, 09:12 PM Thread Starter
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The nozzles I pulled out of it were OR3424

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post #5 of 13 (permalink) Old 02-09-2018, 09:54 PM Thread Starter
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My boost is around 28-30lbs

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post #6 of 13 (permalink) Old 02-11-2018, 01:03 AM
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It's either the timing or you need to turn in the fuel screws.
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post #7 of 13 (permalink) Old 02-11-2018, 01:34 AM Thread Starter
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Iíve adjusted the timing, advancing, retarding, and back to on the money, and no change. Iíve screwed the fuel back down 2 full turns and no change. My CAC was leaking a little so Iíve got one ordered, hoping thatís what it is and I can get back to work.

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post #8 of 13 (permalink) Old 02-12-2018, 09:27 PM Thread Starter
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Replaced the CAC and no change whatsoever, still heating up too quick. Itís going to 1050 degrees bobtailing from 0-60mph

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post #9 of 13 (permalink) Old 02-13-2018, 12:17 PM
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Sounds like classic over-fueling combined with lack of air flow. Did you test boost pressure going directly into the head?

Sometimes a plugged intercooler will cause these symptoms. Or mechanics leave plastic caps or rags in the intake. Cam timing could be set wrong.. Might be a bad mismatch on the injector nozzles.. Don't know where to start..

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post #10 of 13 (permalink) Old 02-20-2018, 08:51 AM
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Sounds like a rag or something in the wrong place I am thinking it is something really wrong if it gets that hot bobtail.... Your boost sounds about right. You might want to double check your pyro and probe. I never had one flake out and read hot but I can see how it could be possible. BTW, if you have recently changed the probe could it by some accident be the wrong probe. some of the probes and guages do not interchange. It depends on what the max on the pyro is. Some were 15 some 1800 iirc and if you use the wrong one you absolutely can have a overly hot reading. I remember reading that in Isspro bulletin somewhere. Pyrometers are actually pretty sensative instruments reading an electrical current generated in the probe by converting heat energy to electrical signal.

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