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Old 02-18-2018, 09:52 AM   #1
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turbocharger

2002 monaco ISC cummins 325hp?. Is there a rebuild kit available? The problem....After accelerating if I let up on gas fast and try to accelerate again immediately NO BOOST! If I gradually let up on gas then no problem. A mechanic told me it sounds like the fins are getting stuck. Any ideas?
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Old 02-18-2018, 10:00 AM   #2
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Fins getting
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Old 02-18-2018, 10:05 AM   #3
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Those things only spin at about 90,000 rpm. I don't think it is getting stuck.

There is a control problem somewhere in the system. Don't go back to that mechanic.

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Old 02-18-2018, 10:19 AM   #4
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2002 monaco ISC cummins 325hp?. Is there a rebuild kit available? The problem....After accelerating if I let up on gas fast and try to accelerate again immediately NO BOOST! If I gradually let up on gas then no problem. A mechanic told me it sounds like the fins are getting stuck. Any ideas?
You need a new "Mechanic". Turbo charger fins don't just stick. Could be a wastegate issue or you need a new turbo, or both. Find a real mechanic to diagnose the problem.
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Old 02-18-2018, 02:51 PM   #5
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When I took my ISC in I asked them to replace the hose on the WG bc it looked old and soft. He basically explained they dont need any actuation and blocked the hose.

And getting off the acclerator and then quickly back on wont give you instant boost.

What does it show on a max load. Do you 23psi? or more?
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Old 02-18-2018, 03:01 PM   #6
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When I took my ISC in I asked them to replace the hose on the WG bc it looked old and soft. He basically explained they dont need any actuation and blocked the hose.

And getting off the acclerator and then quickly back on wont give you instant boost.

What does it show on a max load. Do you 23psi? or more?
Jimmy, you may have misunderstood the explanation for the waste gate. The waste gate is there to prevent the turbo from overspeed and there by preventing engine overload. Very important device.
It, as the name says, "wastes" hot exhaust gas when the intake manifold pressure reaches a pre determined pressure to slow down the turbo charger, preventing engine overload.
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Old 02-18-2018, 03:02 PM   #7
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No. I understand. It still functions. It just doesn't need the hose.
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Old 02-18-2018, 03:06 PM   #8
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No. I understand. It still functions. It just doesn't need the hose.
Okay, if the hose is removed or the port plugged, how does the waste gate know when to open? Just asking since the hose is sensing intake manifold pressure.
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Old 02-18-2018, 03:14 PM   #9
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Fins getting
Wonder what happened to the rest of my post?

On an ISC of that vintage there were no movable fins (variable vane) in the turbo. I installed a Banks kit on my '02 ISC and it included a new turbo housing and waste gate actuator. That upped to boost to 34-35 psi under full throttle.

Could be a sticking exhaust brake or waste gate actuator. I had the exhaust brake stick a few times and there was no power.
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Old 02-18-2018, 03:17 PM   #10
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Okay, if the hose is removed or the port plugged, how does the waste gate know when to open? Just asking since the hose is sensing intake manifold pressure.
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Got me.
Actually, this hose went from the compressor side of the housing to the WG itself. And he said it had a hole in it already..

He's the Cummins cert expert (it was a freightliner-cummins-alison-detroitD shop)...
He said they are routinely like that and it can cause it to not make boost. So they pull and plug..
And it works ..
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Old 02-18-2018, 03:21 PM   #11
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I have no doubt it works but if you happen to travel in mountainous terrain I strongly suggest you keep a close eye on manifold and exhaust gas temperature. Melted pistons tend to get expensive.
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Old 02-18-2018, 03:36 PM   #12
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I have no doubt it works but if you happen to travel in mountainous terrain I strongly suggest you keep a close eye on manifold and exhaust gas temperature. Melted pistons tend to get expensive.
Got VMSpc. And am completely familar with old operating ranges,.
Pulls the same 23-25psi max it used to - and same throttle response. Like I said, I dont know but he's the expert. Its only about 3miles away from the shop.. if it ant right in the next run Im gonna let them know . REST ASSURED.
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Old 02-18-2018, 03:43 PM   #13
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Got VMSpc. And am completely familar with old operating ranges,.
Pulls the same 23-25psi max it used to - and same throttle response. Like I said, I dont know but he's the expert. Its only about 3miles away from the shop.. if it ant right in the next run Im gonna let them know . REST ASSURED.
Like I said, it will be just fine in Texas but if you decide to make a trip to say Colorado, keep a close eye on your VMSpc. These things are there for a reason. I doubt Mr. Cummins would spend the dough on this device if it weren't necessary.

Happy Trails Jimmy,
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Old 02-18-2018, 03:47 PM   #14
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2002 monaco ISC cummins 325hp?. Is there a rebuild kit available? The problem....After accelerating if I let up on gas fast and try to accelerate again immediately NO BOOST! If I gradually let up on gas then no problem. A mechanic told me it sounds like the fins are getting stuck. Any ideas?
As you might see by Jimmy's experience, there are mechanics and then there are real ones. The wanna bees can cost you money. Caution.....
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