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Old 11-09-2018, 09:09 AM   #1
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Noise from Engine

On a couple of occasions on our trip south I thought I heard a shrill noise from the engine area. Was not able to reproduce it when parked and running engine at 1500 rpms. The first thing I will look at is the tensioner but want to ask if anyone has experienced a similar noise and what were the causes. Looking at alternator? Ac compressor? If I remember the 2 times I thought I heard the noise it was using the engine break Jake. This is on an 05 Windsor with 04 ISL 400
Don Barber
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Old 11-09-2018, 09:20 AM   #2
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Monaco Owners Club
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Location: On the road
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Check exhaust manifold at #3 cylinder for leaks...we all get it eventually, poor design.
Happy Trails,
06 Dynasty Countess III ISL//3060
07 Hummer H3
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Old 11-09-2018, 06:09 PM   #3
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Or a cracked manifold, I had to replace mine ~4 years ago.
Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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Old 11-10-2018, 08:18 AM   #4
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Same noise for us. We've had to replace our exhaust manifold twice.
R&K Cat
2006 Monaco Diplomat 40PDQ
2016 Jeep Grand Cherokee Ltd
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Old 11-10-2018, 10:11 PM   #5
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Location: Marysville Washington
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My 400ISL was doing the same thing.... broken exhaust manifold. This is fairly common on this engine. I had the diesel shop do the job because my Endeavor is a rear radiator and itís tough to get to the exhaust manifold...
Good luck with it.
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Old 11-11-2018, 10:52 AM   #6
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Look for soot marks around the exhaust manifold. I just replaced my gaskets yesterday. Blew number 3 gasket.

Good luck

Carl & Barb - 2006 Monaco Signature - Commander
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engine, noise

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