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Old 12-01-2012, 09:46 AM   #1
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Head Gasket

Anyone had any Head Gasket Issues? I seem to have developed a problem with less than 15000 miles on our ISB-6.7 Turbo Diesel 340 HP. Had it towed to Cummins the other day and we are waiting for a diagnosis.
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Old 12-01-2012, 10:44 AM   #2
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Area51,
What year is your coach and what were the symptoms you were experiencing? I have about 21k on my '08 and thankfully, don't have any engine problems.
Tom
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Old 12-01-2012, 12:43 PM   #3
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tmmar,
The coach is a 2008 360QS, we purchased it as a new coach in May 2011, it had about 1200 miles on it. I'm sure most of that was from Elkhart to the dealer. We now are just shy of 15000 miles. While I was getting the coach ready for our winter exodus the check engine light came on along with the LOW COOLANT warning in the LBCU. Checking the coolant overflow tank it was down to the MIN line, I added coolant to bring it up to the MAX line. This did not work so I contacted the Freightliner hot line and was told to fill it to the top and try to jiggle the sensor connector which is at the back of the tank, this did not work. I lit off the engiine and ran it for a few minutes and when I rechecked the tank it was low again. Not seeing any visible leaks (hose connections and such) I checked the dipstick, it was filled to the top of the flat bar at the end of the cable and it was all murky, milky and was chocolate in color. Did not look at all like the oil usually does. Beside all other possible damage I hope the Turbocharger will not be compromised as I understand this is cooled with the crankcase oil as well.
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Old 12-01-2012, 01:25 PM   #4
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How ofter do you service the coach

Just curious. I have a 2008 as well. with only 15000 miles, how often do you service the coach?

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Old 12-01-2012, 03:07 PM   #5
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Area51,
Yeah- it sure sounds like a head gasket problem. Hope Freightliner covers it under warranty. Do you know when the chassis was built? Sure hope it is not a problem with all '08's!
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Old 12-01-2012, 07:43 PM   #6
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silver/tmmar
The coach chassis was manufactured in October 2007 and was put out by Forest River in January 2008. It sat on the dealers lot until I bought it in May 2011. They changed the oil, batteries, tires and did a bunch of other things to account for lot rot. At 3700 I had them remove about a quart of oil as they put in just a bit more than they should have. At 12000 it was serviced, oil, lube and filter. We never had the unit overheat nor have we driven it hard. The CUMMINS rep did not give any particular reason why this might have happened but when they tear it down I should get a report. Because of the purchase date and the low mileage the rep it is pretty sure it is under warrany including the tow (about 90 miles). I've got to say I am pleased with the dealer and with Forest River for all the great service they have rendered. We had a few water leaks, in fact we refer to the unit as Water World, but they were fixed at the factory last April. They are a great group folks in Elkhart and took care of a bunch of stuff when we stopped by.
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Old 12-13-2012, 06:17 PM   #7
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Head Gasket Update

It turns out the water got into the crankcase via a faulty Cup Plug in the Internal Portion of the Cylinder Head. It seems the casting of the head leaves 11 holes which are plugged by these Cup Plugs similar to a common Freeze Plug. The Technician at Cummins said they are made of a pretty soft metal that reacts to anitfreeze. Although only one failed they were all suspect and were replaced with the Updated Stainless Steel ones.The repair was covered under warranty and included some gaskets and filters that were contaminated as well as the oil itself. What is a real shame is the price of the new Cup Plug $2.37ea x 11 = $26.07 not alot of money for the aggravation and damage caused. If anyone is interested I'll post a .pdf copy of the pertinant parts of the invoice. What was not covered was the tow just shy of $800 bucks, I find this disturbing as the Cummins Rep said it would be covered under warranty and I let them send their tow contractor. Nothing wrong with the tow or contractor in fact they were fantastic. However, the warranty is for the first year of ownership for towing an RV. If I had known this I would have used my Good Sam, a little late now.
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Old 12-13-2012, 06:58 PM   #8
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Area51,
Did the Cummins Rep happen to mention if the caps had been updated in later versions of the engine? If so, when did they happen to mention when the change over took place?
Tom
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Old 12-13-2012, 07:16 PM   #9
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They should have covered your towing costs, what would they have done had you just topped up the rad and drove it in, this would have screwed the engine and that would have been a direct result of the 'cheap' plugs they had used. I would keep pushing.
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Old 12-14-2012, 10:07 AM   #10
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Cup Plugs

TMMAR & DDC

First this site Cracked freeze plug - Page 2 - iRV2 Forums has a thred about the Cup Plugs. As far as the tow goes I had read the warranty in the Cummins Book but thought the Rep new more or of a change in policy, I should have known better. On the other hand Good Sam would only tow to the nearest authorized service center. I really wanted a Cummins owned shop not just any authorized independent.
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