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Old 06-12-2011, 06:11 AM   #1
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Engine Noise

While driving along the other day, out of curosity, I turned up the volume on my
backup camera. I heard something that sounded like a dry bearing. A squeakey,
chattering sound.

I does not happen at idle. Perhaps a bit louder under load. If I turn the volume
down everything sounds normal. If I rev the engine in neutral I do not hear it.

The frequency of the noise relates to engine speed not road speed.

My first thought was the belt tensioner. I removed the belt. The bearing felt
tight and normal ;however, I do see some evidence of fretting around the edge of
the spring tensioner. There is no fretting at the bearing. The tensioner spring
operates smoothly.


The alternator, belt idler and water pump bearings all felt good. The dash AC
was on low at the time and I did not think to remove the belt and check the
compressor.

Any thoughts? How do I trouble shoot this problem.

Bob and Esther
2002 Windsor
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Old 06-12-2011, 08:46 AM   #2
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What engine?
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Old 06-12-2011, 09:56 AM   #3
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Quote:
Originally Posted by Robert41 View Post
While driving along the other day, out of curosity, I turned up the volume on my
backup camera. I heard something that sounded like a dry bearing. A squeakey,
chattering sound.

I does not happen at idle. Perhaps a bit louder under load. If I turn the volume
down everything sounds normal. If I rev the engine in neutral I do not hear it.

The frequency of the noise relates to engine speed not road speed.

My first thought was the belt tensioner. I removed the belt. The bearing felt
tight and normal ;however, I do see some evidence of fretting around the edge of
the spring tensioner. There is no fretting at the bearing. The tensioner spring
operates smoothly.


The alternator, belt idler and water pump bearings all felt good. The dash AC
was on low at the time and I did not think to remove the belt and check the
compressor.

Any thoughts? How do I trouble shoot this problem.

Bob and Esther
2002 Windsor
The engine is a Cummins ISC with an Allison 3000 Transmission. The Windsor has a siide radiator

Bob
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Old 06-12-2011, 10:00 AM   #4
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A couple of questions here. Do you think the chattering sound is a regular diesel clatter sound? Is the squeek really turbo whine. Does the squeek get loader under load or climbing hills? You will not hear turbo if at idle or just revving it up from idle?
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Old 06-12-2011, 10:11 AM   #5
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When I hear my engine noise through the backup camera microphone/speaker, it sounds pretty odd too -- definitely different than when I go back there and listen to it "in person." Have you only heard this noise through the speaker? If so, the first thing I would do is have someone else (DW or whoever) gently run up the RPMs while you listen at the rear. In my case, I think distortion in the camera sound system makes it sound worse than it is.
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Old 06-12-2011, 08:34 PM   #6
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I had a similar noise on my ISL Cummins. It turned out to be a leak in the air plumbing to the intake manifold. If so, it will get louder when the turbo boost presure increases.

Have a nice day - Darrel
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Old 06-12-2011, 08:54 PM   #7
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Had the exact same thing last summer on my 2005 Cummins ISL with 45,000 miles. Very high pitch sound like a squeeking bearing. The noise only appeared when the engine was under load. Turned out to be a small leak at the exhaust manifold thankfully covered by the waranty.

Good luck!
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Old 06-14-2011, 05:59 AM   #8
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The sound I'm hearing is defenitely NOT the normal diesel clatter. It does have to be under some load before I hear the noise
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