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Old 10-05-2018, 09:01 PM   #1
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Cummins ISL 425 Dusted

Been having an intermittent Check Engine light coming on. Just took the Coach into Cummins and they diagnosed the following:

STALL TEST CHECKING BLOWBY, HAS 12 INH20 UNDER STALL, SPEC IS 12, WILL BE SLIGHTLY HIGHER ON DYNO OR ON ROAD, REMOVED AIR FILTER AND INTAKE PIPE TO CHECK FOR DUSTING, FOUND INTAKE PIPE CLAMP ON TURBO LOOSE.

*see photo

Recommendation is a removal of the engine to examine cylinders etc. 15K just to get the party started. Iíve had no performance issues, no smoke, and no burning of oil between changes. In fact, the engine has had regular service, yearly air filter changes, and Iíve had zero issues with this engine. It has 68K miles on the engine. 2008 American Coach. Click image for larger version

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ID:	221574This just seems out of line! Am I missing something? Are there other options here?

Thanks
Scott
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Old 10-05-2018, 09:13 PM   #2
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Well, rebuilding the top end of my ISX went over $33,000. New liner and piston in 5 and 6, new head and valves.
So no, I don't think the price is out of line but certainly outlandish!
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Old 10-05-2018, 09:33 PM   #3
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Well, rebuilding the top end of my ISX went over $33,000. New liner and piston in 5 and 6, new head and valves.
So no, I don't think the price is out of line but certainly outlandish!


Was yours dusted as well? Mileage? If so, Iím just curious if you were having any symptoms or just a check engine light?
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Old 10-05-2018, 09:34 PM   #4
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If there are no performance issues or burning oil I would clean up the air intake, fix the clamp and run it for a few miles and monitor things.
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Old 10-05-2018, 09:53 PM   #5
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If there are no performance issues or burning oil I would clean up the air intake, fix the clamp and run it for a few miles and monitor things.
What he said...
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Old 10-05-2018, 10:08 PM   #6
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Start with a oil sample to determine how much dust/sand was injested. Having been there and based on the condition of your impeller it was caught in time. Mine had leading edges that looked like coarse sandpaper and one had 1/8 th inch missing from one end. Fortunately mine had an opposing vain (8 not like your 7) so by smoothing the leading edges with a file and removing an equal amount from the opposing vain...I did not replace the turbo and that was 45K miles ago.

I would change the oil and then sample and change again in 5K miles. Measure the location of the oil on your dipstick after a few miles and then again every thousand miles (under the same conditions) to try and tell how much if any oil consumption you may now have. Also check for any oil spots on your toad.

If no oil on your toad I would consider yourself lucky. If it does use a little oil and there are oil specks on your toad I would make a oil catcher for the engine vent (steel wool in a gallon jug) as oil is cheap and these engines are tougher than most think.
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Old 10-05-2018, 11:50 PM   #7
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All of the above suggestions are good. At $15k from Cummins I would be very suspicious of their diagnosis.


I have come to the conclusion that they are only looking for money
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Old 10-06-2018, 12:46 AM   #8
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In all this did they give you any indication of what was causing the CEL ,, a code ? , or a good explanation of how a dusted engine would cause an intermittent CEL ?
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Old 10-06-2018, 01:34 AM   #9
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You are getting good advice. PM me?
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Old 10-06-2018, 02:49 AM   #10
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I would surely want a second opinion on the codes. If they continue after the clamp has been tightened.

I would get an oil analysis on the current oil - and change oil and filter. Then monitor oil usage over a few thousand miles and get another oil analysis.

Imho.
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Old 10-06-2018, 05:20 AM   #11
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In your picture, right on the center hub piece at 7 o'clock it looks like that center hub may be cracked or dinged....or is that a piece of cloth or something from a rag? Just looks strange from the photo and can't quite make out what it is.
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Old 10-06-2018, 06:28 AM   #12
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Clamp it back up, change the oil and run it.

At worst, it will use some oil and have some blow by. The damage is done, and it should run like that for a very long time.

Or a not much different then needing an overhaul at say 300,000 miles. When it gets real bad, then have it overhauled.
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Old 10-06-2018, 08:59 AM   #13
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Clamp it back up, change the oil and run it.

At worst, it will use some oil and have some blow by. The damage is done, and it should run like that for a very long time.

Or a not much different then needing an overhaul at say 300,000 miles. When it gets real bad, then have it overhauled.

Exactly what I would do. Only thing to loose is a bit of oil at worst. At best you can keep 15K in your pocket.
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Old 10-06-2018, 09:12 AM   #14
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In your picture, right on the center hub piece at 7 o'clock it looks like that center hub may be cracked or dinged....or is that a piece of cloth or something from a rag? Just looks strange from the photo and can't quite make out what it is.


I did inquire about that, itís actually casted that way.
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