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Old 08-06-2016, 07:31 PM   #1
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2008 with 600 ISX - Dropped Valve Candidate

From what I have found so far the 600 and 650 HP engines have the potential for a dropped valve. If the coach has a DPF and one of these motors then its a potential candidate. Is that correct?


My understanding is that there's also a fix for these motors. A new head design.


Has anyone upgraded the head as a preventative fix - in order to (hopefully!) avoid a 30K repair down the road?

Are there reports of coaches with the new heads having problems?

Does anyone know the cost of getting the heads done before the valve drops?

Thanks!
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Old 08-06-2016, 07:41 PM   #2
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Ours supposidly has the new head, valves, ECM programming and new turbo. So far we've only driven it 500 miles in the last year due to the DW's liver cancer and now transplant.
No idea of the cost as a prenentative measure though. I'm betting $20,000 at least.
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Old 08-06-2016, 08:41 PM   #3
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read this article
http://community.fmca.com/topic/7579...sx650-cummins/
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Old 08-10-2016, 09:20 PM   #4
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OK, we're going to skip looking at 2008 and newer. We'd like to avoid the DPF models. Well at least for now until we change the criteria again :-).

If we keep to the 2006 and 2007 model years can we be sure that they are all non DPF and able to run on old school (Mexico) diesel fuel?
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Old 08-10-2016, 09:28 PM   #5
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My coach is a 08' model year, built in 07' and has a DPF.
I'm thinking you may have to buy an 07' model, with a 06' engine.
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Old 08-11-2016, 06:37 AM   #6
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Quote:
Originally Posted by 96 Wideglide View Post
My coach is a 08' model year, built in 07' and has a DPF.
I'm thinking you may have to buy an 07' model, with a 06' engine.

Yes that what I was thinking:
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If we keep to the 2006 and 2007 model years can we be sure that they are all non DPF and able to run on old school (Mexico) diesel fuel?
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Old 08-11-2016, 08:03 AM   #7
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Quote:
Originally Posted by 96 Wideglide View Post
My coach is a 08' model year, built in 07' and has a DPF.

I'm thinking you may have to buy an 07' model, with a 06' engine.

The EPA required all ENGINES built after 1/1/2007 to have the DPF. Most coach builders used engines built before that to finish their '07 models and the started their '08 models at that point.
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Old 08-11-2016, 11:45 AM   #8
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Yes my coach is listed as an 08 but it was built in 07... My Cummins was built in December of 06, so no DPF or other emissions required.... YAY!


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Old 08-11-2016, 04:12 PM   #9
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Same for me, I have an 07 Coach with an 06 non DPF ISX 525. All is running great with it so far.
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Old 08-12-2016, 01:55 PM   #10
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It appears that Cummins has stepped up with +/- 50% of the repair tab in most cases. So I believe most folks have "only" incurred $12-$14,000 for the repairs. So it would probably not make much sense to pay $20K for the new head that may or may not be the answer.
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Old 08-14-2016, 01:18 PM   #11
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Hmmmm.... my '09 Camelot (425HP) was built in '08 and does not have DEF. Maybe I should be happy they used up old engines on my coach. I've got 55,000 miles of trouble free (except one odd incident, see separate post about STOP ENGINE light....).

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Old 08-14-2016, 02:18 PM   #12
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DEF, and Diesel Particulate Filter (DPF), are two different things.

Your engine will have a DPF.

DEF engines didn't come out till 2010.
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Old 08-14-2016, 02:29 PM   #13
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Quote:
Originally Posted by RVNewbie55 View Post
It appears that Cummins has stepped up with +/- 50% of the repair tab in most cases. So I believe most folks have "only" incurred $12-$14,000 for the repairs. So it would probably not make much sense to pay $20K for the new head that may or may not be the answer.
Not true, our bill was over $33,000 and Cummins picked up only $10,400 of it. We paid $22,000+a couple $1,000 in damages to the rig (two broken Koni shocks and broken interior sliding door.
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Old 08-14-2016, 02:44 PM   #14
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John Camelot: You have a DPF. DEF fluid started in 2010 models.
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