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03-03-2020, 08:26 AM
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#1
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Member
Join Date: Jun 2019
Posts: 48
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Does a 2006 ISB have a blow off valve on the exhaust brake?
My MH has a 2006 cummins ISB. The exhaust brake recently started making a louder whistling noise when it activated. I just had the MH in for annual service and told them about this noise. I was thinking possible cracked exhaust manifold, but the mechanics said everything looks good. They did find one intake hose a little loose so that was tightened. The whistle is still there...I was wondering if there is a blowoff type valve on this system (maybe it was stuck before and this "new" noise is normal?).
The dealer said the exhaust brake is not a Pac Brake but a cummins part. If I have any issues they recommended going to a cummins service center.
The exhaust brake functions just fine, kicks in and works like it is supposed to, just a new noise to me.
Any thoughts?
Bob
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03-03-2020, 08:34 AM
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#2
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: May 2016
Location: Kamloops, BC, 60 miles from the Center of the Universe according to the Rinpoche, of the SF monks.
Posts: 7,395
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Look for soot marks along the exhaust manifold and general area of the turbo.
It may not have left much yet if it just started and the shop missed it.
Happy Glamping.
__________________
Happy Glamping, Norman & Elna. 2008 Winnebago Adventurer 38J, W24, dozens of small thirsty ponies. Retired after 40 years wrenching on trucks! 2010 Ford Ranger toad with bicycles or KLR 650 in the back. Easy to spot an RVer, they always walk around with a screwdriver or wrench in one hand! 
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03-03-2020, 09:41 AM
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#3
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Senior Member
Join Date: Nov 2006
Location: Western NY
Posts: 6,149
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My '12 ISB has a variable turbo and not a true exhaust brake... not sure about earlier years but suspect that may be what the mechanic was getting at.
See https://www.irv2.com/forums/f123/exh...ke-220316.html
__________________
Don & Marge
'13 Newmar Ventana 3433 - '14 CR-V TOAD
'03 Winnebago Adventurer 31Y - SOLD
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03-03-2020, 10:07 AM
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#4
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Senior Member
Join Date: Nov 2015
Posts: 26,840
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Quote:
Originally Posted by Unplanned
Look for soot marks along the exhaust manifold and general area of the turbo.
It may not have left much yet if it just started and the shop missed it.
Happy Glamping.
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YEP^^^^^
SOME SOUND IS NORMAL DURING THE OPERATIONOF THE BRAKE. THE SOUND WILL BE MORE OF A WOOSHING SOUND THEN A WHISTLE.
Whistling sound is usually caused by an exhaust leak.Look at and around the brake for carbon tracks.Visible carbon will indicate where the exhaust is leaking
Check the exhaust brake clamps.
If the clamps are tight, the gasket might be damaged ormissing.
Soot WILL show up at 'leak'
__________________
I took my Medication today. HAVE YOU?
Dodge 3500 w/Tractor Motor
US NAVY---USS Decatur DDG-31
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03-03-2020, 10:12 AM
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#5
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Senior Member
Join Date: Nov 2015
Posts: 26,840
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Quote:
Originally Posted by Winemaker2
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2006 ISB does NOT use the VGT (Variable Geometry Turbocharger)
2007.5 was 1st year for the VGT
__________________
I took my Medication today. HAVE YOU?
Dodge 3500 w/Tractor Motor
US NAVY---USS Decatur DDG-31
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03-03-2020, 11:15 AM
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#6
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Senior Member
Join Date: Nov 2006
Location: Western NY
Posts: 6,149
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Quote:
Originally Posted by Old-Biscuit
2006 ISB does NOT use the VGT (Variable Geometry Turbocharger)
2007.5 was 1st year for the VGT
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[emoji106] Thnx
__________________
Don & Marge
'13 Newmar Ventana 3433 - '14 CR-V TOAD
'03 Winnebago Adventurer 31Y - SOLD
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03-03-2020, 01:05 PM
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#7
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Member
Join Date: Jun 2019
Posts: 48
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Thanks for the replies everyone. I'll keep an eye out for some soot but might have to put some more miles on it since I cleaned the engine pretty good recently (didn't see anything obvious).
So no blowoff valve or wastegate on the exhaust brake then?
Bob
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03-03-2020, 01:12 PM
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#8
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Senior Member
Monaco Owners Club
Join Date: Jan 2016
Location: New Hampshire
Posts: 593
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If it’s whistling, it most likely is a leaking exhaust gasket. They are a sandwich of metal and some other material similar to asbestos. When the other material deteriorates, it leaves the metal behind and it acts like a reed and will whistle. Happened to us in Yellowstone. A $500 fix if you have a side radiator.
Walt
__________________
Walt & Bonnie
2006 Monaco Camelot 40PAQ, Cummins 400 ISL
'22 Ford Escape PHEV, Roadmaster BP, Sterling towbar
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03-24-2020, 09:44 AM
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#9
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Member
Join Date: Jun 2019
Posts: 48
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Self healing?
Hmmm, self healing? Maybe at least temporary I guess. Wife and I just got back from a 1400 mile trip in the MH. While the whistle/noise was there when we left, it kept getting better (quieter) as we put miles on. By halfway through the trip it was gone. Sounds like it still might be an exhaust gasket leak that just swelled up a little from driving. But it was nice to have it quiet again for awhile. I'll keep checking for leaks until I see something suspicious.
Bob
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03-24-2020, 09:52 AM
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#10
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Senior Member
Join Date: Jan 2018
Location: Capistrano Beach, California
Posts: 4,465
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Quote:
Originally Posted by BnR
Hmmm, self healing? Maybe at least temporary I guess. Wife and I just got back from a 1400 mile trip in the MH. While the whistle/noise was there when we left, it kept getting better (quieter) as we put miles on. By halfway through the trip it was gone. Sounds like it still might be an exhaust gasket leak that just swelled up a little from driving. But it was nice to have it quiet again for awhile. I'll keep checking for leaks until I see something suspicious.
Bob
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Just curious, did the whistling appear before or after you did the thorough cleaning of the engine?
__________________
Larry, Eileen, and Finley
2004 Alpine 36FDDS
Third motor home, first Alpine, no need for another.
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03-24-2020, 02:46 PM
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#11
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Member
Join Date: Jun 2019
Posts: 48
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Quote:
Originally Posted by Ljwt330
Just curious, did the whistling appear before or after you did the thorough cleaning of the engine?
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Noise was there well before I cleaned engine. Other good news is I was able to pull our boat/trailer (~5000lb) up and over the I5 Siskyou pass with no overheating issue. Temp never went over 195. New radiator cap appears to have fixed that issue.
Bob
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03-24-2020, 05:43 PM
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#12
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Senior Member
Freightliner Owners Club
Join Date: Mar 2002
Location: Western WA
Posts: 1,294
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Quote:
Originally Posted by Old-Biscuit
2006 ISB does NOT use the VGT (Variable Geometry Turbocharger)
2007.5 was 1st year for the VGT
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WRONG! I have a 2007 Winnebago Journey with a 2006 Cummins ISB-02 300 HP, 600 ft/lb torque engine for power. IT DOES HAVE THE VGT TURBO which is used as the exhaust brake. They are prone to failure, I have a high dollar repair bill to document having mine replaced.
__________________
Sold the Motorhome, joined the fully retired gang. '07 Winnebago Journey 34H, ISB-02, MH2500
Toad - '08 Ford Taurus X, Blue Ox, Aventa
US Gear UBS
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03-24-2020, 05:52 PM
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#13
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Senior Member
Winnebago Owners Club Freightliner Owners Club RV Trip Wizard
Join Date: Nov 2018
Posts: 229
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Quote:
Originally Posted by FleetMan
WRONG! I have a 2007 Winnebago Journey with a 2006 Cummins ISB-02 300 HP, 600 ft/lb torque engine for power. IT DOES HAVE THE VGT TURBO which is used as the exhaust brake. They are prone to failure, I have a high dollar repair bill to document having mine replaced.
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FleetMan
I too have a VGT Turbo as I just called Cummins to verify that in my 5.9 ISB .
Can you tell me about your Turbo failure.
__________________
05 Itasca Meridian 32'
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03-24-2020, 09:12 PM
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#14
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Senior Member
Freightliner Owners Club
Join Date: Mar 2002
Location: Western WA
Posts: 1,294
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IMDiesel, for a better understanding of how thr VGT turbo operates, look up some of the schematics or videos on line if you have not already done so. My turbo failure made itself known while pulling the I-40 hill westbound out of Albuquerque, pulling the hill westbound into Henderson, NV and on the hills on I-84 just west of Ontario, OR all on the same trip. Check engine light and warning beeper every time. If I backed out of the throttle and slowed down, the beeper and light would stop. No indication of over heating. Power and performance on the level and slight inclines were normal. Cummins Northwest in Chehalis,
WA pulled the codes, confirmed the turbo problem and completed the repairs.
__________________
Sold the Motorhome, joined the fully retired gang. '07 Winnebago Journey 34H, ISB-02, MH2500
Toad - '08 Ford Taurus X, Blue Ox, Aventa
US Gear UBS
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