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Heavy knocking sound. Video included

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DcDuqueMuerto

New member
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Location
Denver, CO
Hey All,

Putzing around with the truck (m923a2), my cousin mentioned the engine sounds like it's knocking. Now, it has sounded that way from the day I brought it home from the base. It has driven a few thousand miles, and passed emissions during that time. Never had any issues with it engine wise. I even asked the guys at the local Cummins dealer if it sounded bad, and they didn't seem too concerned.

I can't tell from videos, and not sure if I'm being paranoid. But, it definitely sounds bad to me.

I couldn't get the video to post here, so hopefully the link is ok:

https://youtu.be/k5XuXulvltU

Any thoughts/suggestions?
 
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DcDuqueMuerto

New member
38
0
0
Location
Denver, CO
I posted this in the wrong forum. Trying to delete the other.

Hey All,

Putzing around with the truck (m923a2), my cousin mentioned the engine sounds like it's knocking. Now, it has sounded that way from the day I brought it home from the base. It has driven a few thousand miles, and passed emissions during that time. Never had any issues with it engine wise. I even asked the guys at the local Cummins dealer if it sounded bad, and they didn't seem too concerned.

I can't tell from videos, and not sure if I'm being paranoid. But, it definitely sounds bad to me.

I couldn't get the video to post here, so hopefully the link is ok:

https://youtu.be/k5XuXulvltU

Any thoughts/suggestions?
 
SETOYOTA

SETOYOTA

Well-known member
Steel Soldiers Supporter
2,394
419
83
Location
georgia
Did you have the throttle pulled out? If that's idle it sounds high to me.
 
ghettoct

ghettoct

Member
55
0
6
Location
williamsburg,virginia
mine had same sound, was the air compressor. it was leaking at the head and the unloader on top of compressor. just mix up some dawn and water and squirt it on the compressor top and watch for bubbles. i replaced my compressor through napa and the knock is gone. as well as air leak.
 
tbar123

tbar123

Member
691
24
18
Location
enon,oh
Do you only hear it from the front of the truck? If so it's not the engine it has something to do with the radiator mount. I picked up the same knock after I rebuilt the radiator.It's from a bolt not being spec'd out. Most likely the mount!When the fan turns on it disappears.
 
mcmullag

mcmullag

Member
919
13
18
Location
Colorado Springs, CO region
Would you be able to re-post a video/audio of when it is all air-ed up and the compressor has stopped running?
(if I remember correctly, after you get that loud hiss from the bottom of the air dryer, the air compressor kicks off)
I do remember a knocking noise on my two, when the air compressor was running.
 
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DcDuqueMuerto

New member
38
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0
Location
Denver, CO
I can do that. There was a leak from the top of the compressor. We fixed that (or thought so) as we replaced the gasket at the top.

Hoping not to have to replace the compressor, but we'll see. I'll get a video posted this weekend.
 
S

Stranger

Member
119
1
18
Location
Weatherford, OK
I was being driven crazy by a heavy knocking sound at the front of mine.

Turned out to be a loose tow shackle vibrating back a forth on the mount. A quick squeeze in the vice fixed it.
 
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DcDuqueMuerto

New member
38
0
0
Location
Denver, CO
The compressor was/is on it's way to the grave. Had to take it in for emissions and the shop did some inspecting and verified it was toast. It'll hold air, just won't build it up. Putting in a new one this weekend.
 
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