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Country Coach Restoration, Repair & Parts Forums => Country Coach Archive => Topic started by: Kenccain on June 07, 2005, 10:37:29 pm

Title: cummins turbo charger noise
Post by: Kenccain on June 07, 2005, 10:37:29 pm
Yahoo Message Number: 16825 (http://groups.yahoo.com/neo/groups/Country-Coach-Owners/conversations/messages/16825)
I have a '05 Allure 470 with a cummins 400 with a high piched noise from the exaust. The turbo charger was replaced by Cummins after the first noise was heard at about 12,000 miles. Cummins removed the intake

boot and observed sparks comming from the first stage intake fan. The new turbo charger has a simmilar noise but somewhat reduced in level.
I have heard that the industry has had problems with this in the past few years. Has anyone experienced simmilar problems?
Title: Re: cummins turbo charger noise
Post by: Ray G_01 on June 08, 2005, 01:13:03 pm
Yahoo Message Number: 16834 (http://groups.yahoo.com/neo/groups/Country-Coach-Owners/conversations/messages/16834)
Ken, we also have a 470 with the 400 Cummins. It does in fact have a slight whistle when the engine is at low rpm's, and has had the sound since new..... Cummins assured me that all units have the whistle, and that it's the "new" single vane turbo that they are using????....
I had the Cummings people check it at the CCI rally in Moultrie as well as at a Cummins dealer (without telling either about the other one checking it). They both confirm that a slight whistle is "normal".
I also had them check the fact that it smokes a bit a start up and at idle. Both verified that the latest mods were in for the engine and that it would be awhile before they updated....
If you find out different than the above, please let us know. Thanks

Ray and Rue
05 Allure 31176
.

Quote from: kenccain
Title: Re: cummins turbo charger noise
Post by: Kenccain on June 08, 2005, 01:33:31 pm
Yahoo Message Number: 16836 (http://groups.yahoo.com/neo/groups/Country-Coach-Owners/conversations/messages/16836)
Ray,

Thank you for your reply. We had cummins replace the turbo due to "excessive" noise and after visually checking the turbo with the intake hose disconnected -- sparks were being observed around the fan.

The replacement turbo is making the same noise. My brother-in-law just took delivery on his new 470 Allure and we hear no noise from his. Our coach did not make this noise for at least 11,000 miles. We are currently at Buddy Gregg in Dallas and I have not heard the noise on other 400 cummins in the few days here.

Thanks again for your reply.
Ken

Quote from: ragarue
Ken, we also have a 470 with the 400 Cummins. It does in fact have

a

Quote
slight whistle when the engine is at low rpm's, and has had the

sound

Quote
since new..... Cummins assured me that all units have the whistle,

and

Quote
that it's the "new" single vane turbo that they are using????....

I had the Cummings people check it at the CCI rally in Moultrie as

well

Quote
as at a Cummins dealer (without telling either about the other one > checking it). They both confirm that a slight whistle is "normal".

I also had them check the fact that it smokes a bit a start up and

at

Quote
idle. Both verified that the latest mods were in for the engine and > that it would be awhile before they updated....
> If you find out different than the above, please let us know. Thanks >

Ray and Rue
05 Allure 31176

.

[quote author=kenccain"

> I have a '05 Allure 470 with a cummins 400 with a high piched

noise

Quote
from the exaust. The turbo charger was replaced by Cummins after

the

Quote
first noise was heard at about 12,000 miles. Cummins removed the > > intake

> boot and observed sparks comming from the first stage intake fan.

The

Quote
new turbo charger has a simmilar noise but somewhat reduced in

level.

Quote

> I have heard that the industry has had problems with this in the

past
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