Knocking 3406b frustrated !! - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 10 (permalink) Old 03-31-2016, 06:05 AM Thread Starter
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Angry Knocking 3406b frustrated !!

Customer brought me this truck already taken apart didn't hear it run. Said 3-4-5 were full of water motor wouldn't turn over they pulled the head. Then I got it. Exchanged head reassembled got coolant in oil. Teardown and inspect. Found cracked liner. Replaced all 6 cyl packs oil pump and all bearings. Started up smooth but has a knocking noise at the front lower end checked everything can't seem to find the knock.
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post #2 of 10 (permalink) Old 03-31-2016, 02:16 PM
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Originally Posted by Engine fairy View Post
Customer brought me this truck already taken apart didn't hear it run. Said 3-4-5 were full of water motor wouldn't turn over they pulled the head. Then I got it. Exchanged head reassembled got coolant in oil. Teardown and inspect. Found cracked liner. Replaced all 6 cyl packs oil pump and all bearings. Started up smooth but has a knocking noise at the front lower end checked everything can't seem to find the knock.
Check for broken crank.Use a bar on the front to pry crank forward and a screw driver on the flywheel and pry it backwards.
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post #3 of 10 (permalink) Old 03-31-2016, 02:42 PM Thread Starter
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I've done that several times. Pulled rod caps back off pulled main caps. Can't find anything.
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post #4 of 10 (permalink) Old 03-31-2016, 04:56 PM
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Did you match part numbers on bearings, could have cut crank.
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post #5 of 10 (permalink) Old 03-31-2016, 05:03 PM Thread Starter
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They were aftermarket but no signs of oversized
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post #6 of 10 (permalink) Old 03-31-2016, 07:30 PM
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Could be fuel knock from bad nozzle on #1.
Are nozzles new?
Does it smoke at all?
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post #7 of 10 (permalink) Old 03-31-2016, 07:35 PM Thread Starter
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Yes the nozzles are new and it smokes very little
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post #8 of 10 (permalink) Old 03-31-2016, 09:59 PM
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Does it change tones? When mine went back together I had a know that would come and go, I had to crack all the lines before it went away.

Cody.

79 KW W900A 3406B, Garrett GT55 turbo, RTO12513,
4.11 SQHP rockwells

79 KW K100C 400BC1, Holset HT4B hybrid, custom
injectors, RTO12513, 4.33 eaton DS380s

00 Freightliner Classic XL C15
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post #9 of 10 (permalink) Old 04-01-2016, 12:34 AM Thread Starter
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it stays the same even when you crack the lines loose
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post #10 of 10 (permalink) Old 04-04-2016, 07:40 AM
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Air compressor about to chuck a rod? Depending on type, advance carrier trying to grenade and hitting cone cover? Balancer slipped (if not updated to fluid typealready) or loose.
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