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Old 10-03-2016, 10:18 AM   #1
Mini-Skoolie
 
Join Date: Sep 2016
Location: Hendersonville, TN
Posts: 40
Year: 1997
Coachwork: Thomas
Chassis: 1T8
Engine: Cummins 5.9
Rated Cap: Dunno, big though.. Hauls
Weird Sound Coming from Engine:::

Got an odd sound coming from my 5.9l Gen 1. Don't know what it is, but it's throttle responsive. It doesn't do it all the time, but when it does, it is when the engine is pulling hard, and fades away. then goes away at idle, or coasting under power or not. Can someone identify it??

https://youtu.be/U4aRM3cxBWw

Thanks ahead of time.

<iframe width="560" height="315" src="https://www.youtube.com/embed/U4aRM3cxBWw" frameborder="0" allowfullscreen></iframe>


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Old 10-03-2016, 11:08 AM   #2
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Join Date: Oct 2015
Location: Spring Valley AZ
Posts: 531
Year: 2000
Coachwork: Bluebird
Engine: 5.9 Cummins
Rated Cap: 2 elderly children
I hear a squeal that sounds like the belt tensioner pulley.
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Old 10-03-2016, 11:12 AM   #3
Mini-Skoolie
 
Join Date: Sep 2016
Location: Hendersonville, TN
Posts: 40
Year: 1997
Coachwork: Thomas
Chassis: 1T8
Engine: Cummins 5.9
Rated Cap: Dunno, big though.. Hauls
Might be... The alternator was a bitch to get the belt on...
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Old 10-03-2016, 11:41 AM   #4
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Join Date: May 2009
Location: Columbus Ohio
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Year: 1991
Coachwork: Carpenter
Chassis: International S3800
Engine: DT360
Rated Cap: 7 Row Handicap
almost sounds like a turbo V-band leak to me.. if you take the belts off and start it (dont run it too long it will get hot).. does the sound go away?

-Christopher
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Old 10-03-2016, 01:21 PM   #5
Mini-Skoolie
 
Join Date: Sep 2016
Location: Tenino, Wa (20 mi SE of Olympia)
Posts: 22
Year: 1989
Coachwork: Bluebird
Engine: CAT 3208
Rated Cap: 84 pass 36200 gvw
I think I agree with 2kool, when my tensioner (on my P/U) started failing it took me almost two months to narrow it down to the tensioner cause I couldn't hear it at idle until it got pretty bad.
Lot harder to drive with the hood open on a truck
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Old 10-03-2016, 01:29 PM   #6
Mini-Skoolie
 
Join Date: Sep 2016
Location: Hendersonville, TN
Posts: 40
Year: 1997
Coachwork: Thomas
Chassis: 1T8
Engine: Cummins 5.9
Rated Cap: Dunno, big though.. Hauls
Dunno, haven't driven it since Sunday. Will try tonight to see if that's it.
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Old 10-03-2016, 01:30 PM   #7
Mini-Skoolie
 
Join Date: Sep 2016
Location: Hendersonville, TN
Posts: 40
Year: 1997
Coachwork: Thomas
Chassis: 1T8
Engine: Cummins 5.9
Rated Cap: Dunno, big though.. Hauls
What is a vband? That the clamp that attaches the tubes to it? I will check that tonight too...
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Old 10-03-2016, 01:49 PM   #8
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 3,393
Year: 1991
Coachwork: Carpenter
Chassis: International S3800
Engine: DT360
Rated Cap: 7 Row Handicap
yeah its the clamp that goes on the exhaust output of the turbo to the downpipe (the pipe going under the bus to the muffler).. it will make a high pitched sound like that when the turbo is spooling up... I know I fought mine for awhile on my DT-360 till I think i finally got it nailed..

-Christopher
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Old 10-03-2016, 02:04 PM   #9
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Join Date: Mar 2011
Location: Houston, Texas
Posts: 4,801
Year: 1946
Coachwork: Chevrolet/Wayne
Chassis: 1- 1/2 ton
Engine: Cummins 4BT
Rated Cap: 15
Best way to overcome diesel engine noise is to run 6" straight exhaust stacks with no resonators. The noise will still be there but...
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Old 10-03-2016, 02:14 PM   #10
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 3,393
Year: 1991
Coachwork: Carpenter
Chassis: International S3800
Engine: DT360
Rated Cap: 7 Row Handicap
I actually thought the Vband leak sounded cool, but it made it smell like diesel inside since it was right near the doghouse.. and I was afraid it might cause issues with the turbo..

the bus sounded like a Semi when I hammered it..

-Christopher
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