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Old 10-21-2021, 11:10 AM   #1
MKW
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Cummins IHS300 turbo charger

Hi folks….thanks for allowing my wife and I to join. I have lost turbo charger. Any ideas? What could cause this? I have no pressure on the gauge and I also have no exhaust temperature reading. Fuse???
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Old 10-21-2021, 11:12 AM   #2
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Welcome to iRV2.


What engine do you have? IHS 300 doesn't ring any bells.


What coach?


Have you checked boots/plumbing from turbo to CAC and CAC to intake manifold?
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Old 10-21-2021, 11:41 AM   #3
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Welcome to iRV2.


What engine do you have? IHS 300 doesn't ring any bells.


What coach?


Have you checked boots/plumbing from turbo to CAC and CAC to intake manifold?
It’sa 99 Holiday Rambler Navigator
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Old 10-25-2021, 02:21 PM   #4
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Originally Posted by MKW View Post
Hi folks….thanks for allowing my wife and I to join. I have lost turbo charger. Any ideas? What could cause this? I have no pressure on the gauge and I also have no exhaust temperature reading. Fuse???
Note to all….Never type when tired. Our coach has a Cummins ISC 350 engine. I changed the filter. Removed and cleaned all the tubing into the turbo charger. Still no luck. I’m confused because I’m not showing exhaust temperature either?

I apologize for providing bad information initially. 12 hr drive into the ozarks without turbo was intense.

Thanks in advance for any help!
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Old 10-25-2021, 03:18 PM   #5
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Start by checking rubber hoses connected to the air to air intercooler. Then follow the pipes to the turbo charger. If your lucky one of the hoses has popped off or has a hole in it. Check your air to air intercooler for any holes.
If you can’t find any holes or rubber hoses damaged then you will have to look inside the turbocharger to make sure the turbine fins are still there.
The usual cause is a failed hose clamp ona rubber hose on the boost side or pressure side of the turbine.
Good luck
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Old 10-25-2021, 03:48 PM   #6
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It’s a 99 Holiday Rambler Navigator
The exhaust temp gauge , would have been a Holiday Rambler install , not Cummins , so you'll have to look over the engine for the sensor , either drilled into the exhaust manifold or just down the pipe from the turbo .

Waste gate control has to be examined , to make sure the actuator control rod hasn't separated from the gate lever.
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Old 10-29-2021, 06:56 PM   #7
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The exhaust temp gauge , would have been a Holiday Rambler install , not Cummins , so you'll have to look over the engine for the sensor , either drilled into the exhaust manifold or just down the pipe from the turbo .

Waste gate control has to be examined , to make sure the actuator control rod hasn't separated from the gate lever.
Skip, If The seals go bad in the Turbo would it draw oil from the oil pan. I'm told that the Turbo draws oil to lubricate the bearings and returns back to the oil pan?????

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Old 10-29-2021, 07:18 PM   #8
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Skip, If The seals go bad in the Turbo would it draw oil from the oil pan. I'm told that the Turbo draws oil to lubricate the bearings and returns back to the oil pan?????



Joep Smoke’n Diesel

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Cummins, ISB 300HP Low Torque5.9L/359 Cu. In.

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The engine oil pump sends oil to the turbo and it lubs and cools the center bearing. That oil is returned to the oil pan.
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Old 10-30-2021, 12:55 PM   #9
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While I was driving on a highway suddenly I lost turbo. Upon arrival I checked the connector boots and tested CAC, I was convinced that the turbo unit was the culprit though I couldn't see anything wrong obviously. Ordered one online and got it installed in two days (part of the time was contributed to soaking the bolts/nuts with penetrating oil). It's not too bad of a job on an ISC engine. After It's done I took the coach out for a spin; on a small uphill road, I was instantly telling myself I had nailed it, it was like night and day.

OP, first check your connector boots, then do a CAC test. If no issues, it's time for a new turbo. Best of luck!
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Old 10-30-2021, 01:49 PM   #10
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The engine oil pump sends oil to the turbo and it lubs and cools the center bearing. That oil is returned to the oil pan.
Just noticed that my oil pressure gauge quit working totally pegged all the way to the right, my secondary oil pressure gauge also quit working. I don't believe the oil pump quit, if it did i don't think i could have gone 1000 plus miles without the engine seizing up. Any thoughts.

Joep
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Old 10-30-2021, 04:53 PM   #11
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I'm confused by what your are reporting.

Did you lose the "gauges" only?

Losing Oil pressure, Boost, and Exhaust temp gauges could all be due to the same problem (assuming boost and temp gauges are electrical) like bad ground wire at gauge cluster.

Is the Coach running okay?

If the turbo failed completely I don't see how you could drive 1000 miles.

If the wastegate was stuck partially open, or you have a bad hose from turbo outlet to intake manifold, you would be down on power. How much down depends on how much boost your losing.
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Old 10-31-2021, 12:24 AM   #12
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I'm confused by what your are reporting.

Did you lose the "gauges" only?

Losing Oil pressure, Boost, and Exhaust temp gauges could all be due to the same problem (assuming boost and temp gauges are electrical) like bad ground wire at gauge cluster.

Is the Coach running okay?

If the turbo failed completely I don't see how you could drive 1000 miles.

If the wastegate was stuck partially open, or you have a bad hose from turbo outlet to intake manifold, you would be down on power. How much down depends on how much boost your losing.
No Just the Oil Pressure Gauge, Engine Seems to run fine except for.... can't get into that for now.....
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