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Old 06-26-2015, 11:25 AM   #15
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Spartan chassis. Which I thought was the better of the two chassis. In 2013 they had to replace the radiator. Spartan had what my rv shop called a "light recall". Spartan paid for the labor and the radiator, I had to pay for the coolant. Total BS.

I've read, here on irv2, where the owners of other Discovery 40Gs on Spartan chassis have had to foot the whole bill because the radiator failed after the warranty period.
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Old 06-26-2015, 11:25 AM   #16
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As far as the granny goes, it is a 6 speed. Does that mean it is an Allison 3000MH? Or could it still be the 2000MH?
All Discovery's have had the Allison 3000MH put in them since they started making them back in the late 90's

Your D was built around the time the new Fleetwood owners took over.
It may be possible they found a old 10 year + left over 5.9L someplace in storage. That was forgotten about.
And it got put in yours.

If it was built maybe in 2009 by the old company. You may be out of luck on getting a 6.7L
Built by the new company then you may have a chance.
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Old 06-26-2015, 11:34 AM   #17
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The last time a Discovery used a ISB 5.9L Cummins engine was the 2000 year model.
With the 2001.5 through 2007 the Cat 7.2L was used
2008 to 2010 the ISB 6.7L
2011-2012 ISC 8.3L
2013-2015 ISL 9L

Triker56 is right with this post. Something doesn't pass the smell test.

If you will post your engine serial number, I'll plug it into the Cummins Quickserve App.


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Old 06-26-2015, 12:16 PM   #18
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I found an ISB engine # 73032911
Thanks
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Old 06-26-2015, 12:46 PM   #19
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Fleetwood went bankrupt in 10 depending when your coach was built you may have no one to sue 😢
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Old 06-26-2015, 12:47 PM   #20
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Without confirming the serno with Cummins, all info here is conjecture at best. You need to get absolute confirmation of the engine size.

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Old 06-26-2015, 01:43 PM   #21
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Any opinions?

I bought a new 2010 coach 40 foot DP in 2010, I was very disappointed in the engine performance since the day I bought it. I accepted this as how a 40 foot coach performed. The spec sheet, the sales brochure
and NADA list the only engine size, in this coach as an ISB 6.7L engine.

Four and a half years later (last Monday) I had engine head gasket failure and had to have the coached towed to a shop. The shop advised me I do not have an ISB 6.7L engine, in fact I have an ISB 5.9L engine. The engine sticker indicates the engine as an ISB, without an engine size.

The ISB 5.9L engine was not even an option for this size of coach, the Sales brochure only indicates the 6.7L. I checked NADA (National Auto Dealers Association) guide and it only lists a 6.7L engine, no other engine was listed. The sales contract I have indicates the engine as an ISB 6.7L.

What to do?
get a different mechanic
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Old 06-26-2015, 01:45 PM   #22
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I found an ISB engine # 73032911

Thanks

I plugged this serial number into the Cummins Quickserve app.

Your engine is an ISB350
Build date is Sept 24, 2009.
It has to be 6.7 because the 5.9 was a couple of years out of production at that time.

The Cummins app will not allow a copy/paste.


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Old 06-26-2015, 01:47 PM   #23
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Based on the 2010 Fleetwood information the model coach you purchased, (Discovery) comes with a 350 HP Cummins engine with a 6.7L displacement.

That appears to be exactly what you have, an ISBXT 6.7L, as listed in the 2010 Fleetwwood Discovery brochure. http://www.discoveryowners.com/2010_di_b.pdf

In order for the Cummins ISB350 engine to produce 350HP it must have a displacement of 6.7L. And, that's why it's called the ISBXT 6.7L in the brochure.

From the Cummins website with your engine serial number 7302911, shows that you have the correct engine.

Model: ISB 350
VIN: 4VZDN1A98AC072990
Build Date: 24 Sep 2009
Warranty Start Date: 10 Feb 2012


If your mechanic can prove that your engine with the above serial number matches the specifications of a 5.9L engine, (piston diameter), then you have a problem/case.
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Old 06-26-2015, 01:55 PM   #24
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There should be two stickers on the side wall in back of the driver's seat. One is the Federal Certification Tag and the other has to do with Component Information...can't recall the name. They should list engine name, size, and HP, same for the trans. It should also have serial numbers for them.

The 6.7L is an updated version of the 5.9. IMHO, both are too small for a 40' coach.
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Old 06-26-2015, 02:06 PM   #25
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Wrong engine

Here is a pic of the screen:








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Old 06-26-2015, 02:09 PM   #26
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Originally Posted by Steve Ownby View Post
Here is a pic of the screen:







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Sorry, couldn't make it work.


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Old 06-26-2015, 03:06 PM   #27
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Thanks Steve.
I don't understand why Cummins Pacific and the shop it's at now tell me it's a 5.9
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Old 06-26-2015, 03:24 PM   #28
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Thanks Steve.
I don't understand why Cummins Pacific and the shop it's at now tell me it's a 5.9
Maybe they can't tell the difference.
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