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Old 12-26-2017, 01:25 PM   #1
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Class A Winnebago making intermittent noise

Hey I have a Winnebago elante that is making a rattling noise as i drive. It only happens when i am holding a steady speed and lessens as i decelerate. The noise is not there at all when i accelerate. The noise seems to be comming from the transmission area. Does anyone know what might make a noise like that? Thanks.
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Old 12-26-2017, 08:32 PM   #2
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Block the wheels while parked on a level surface, release the park brake and check the u-joints for any play.
How old and what size/drive train do you have?
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Old 12-26-2017, 10:53 PM   #3
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U-joints or driveshaft carrier bearing would be my first suspicion.
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Old 12-27-2017, 10:22 AM   #4
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Not wanting to insult but if you dont know how to check the U joints you lay underneath the rig and twist the driveshaft back and forth. If there is any movement at all have a shop look at it. With a car you can do this with one hand but the rv might require two hands with gloves and a bit of muscle. I believe Lt Dan is referring to the pillow blocks on the driveshaft and you might have to push up or down to check them. Please correct me if I am wrong Dan.

Good luck and keep us posted.
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Old 12-27-2017, 11:18 AM   #5
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That sounds about right, however when i checked everything seems to be tight
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Old 12-27-2017, 11:24 AM   #6
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Rattle? I'd be looking at heat shields.
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Old 12-27-2017, 11:49 AM   #7
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An exhaust heat riser valve, if you have one, does just what you describe.
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Old 12-27-2017, 08:45 PM   #8
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I am unfamiliar with the heat riser valve. How would i check it ?
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Old 12-28-2017, 08:07 AM   #9
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This is on a chevy 454
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Old 12-28-2017, 08:27 AM   #10
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Quote:
Originally Posted by alank View Post
An exhaust heat riser valve, if you have one, does just what you describe.
Oh that is right I had forgotten all about the heat riser.

Good call.
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Old 12-29-2017, 05:39 AM   #11
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https://r.search.yahoo.com/cbclk2/dW...c=X3IDMgRydAMx

WOW I did not realize this link would be that big. Anyway hopefully this will bring up a picture. It is located on the drivers side of the motor between the exhaust manifold and the exhaust pipe. It holds the heat in the motor until it warms up and also rattles eventually. Wont hurt anything but can be annoying.

Good Luck and keep us posted
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Old 12-29-2017, 11:20 PM   #12
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Thanks. Sorry for the late replies. ive been traveling for the last few days. Finally made it home where i can start to dig into this a little more. Ill let you guys know what I find.
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Old 12-29-2017, 11:35 PM   #13
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Something else to check while you are looking at the GM engine... On GM chassis they routed the main wiring loom inside the left frame rail past the exhaust manifold.
Make damn sure that the wiring loom is securely attached to the frame rail and that the heat deflector is in place.....Ours was not and fried (melted) all the wires into a big glob shorting everything out..Got that sorted out (after a tow home) then sold the coach
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