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Old 05-06-2021, 08:22 AM   #1
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DEF Head Failures What Chassis

Are the DEF head failures happening on both the Freightliner and Spartan Chassis's
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Old 05-06-2021, 11:04 AM   #2
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Ours failed last week while we were in the Cochella Valley. Spartan sent a replacement overnight and Mobil Lube Express had a mechanic out the next morning to replace it. Great service from both companies.
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Old 05-06-2021, 06:51 PM   #3
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The DEF head problems are both FL and Spartan chassis. It is even across the complete HD DEF systems since 2016. In 2016 diesel engine companies were required to start testing DEF fluid for the correct fluid. This has turned out to be a big problem because the sensors for checking the DEF fluid have been sending incorrect information to the ECM and so the DEF head has to be replaced or engine will derate or stop running. Many HD trucks have this same problem at this time. Many use the same equipment for their DEF system.
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Old 05-06-2021, 07:06 PM   #4
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It seems more of a problem with Spartan than Freightliner. Just read some of the threads on the Entegra form. 3 years and no problems on my FL.
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Old 05-06-2021, 07:08 PM   #5
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It has also affected Tiffin's Power Glide chassis, primarily 2017-2019 year models. There have been others but the most were in that year range.
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Old 05-06-2021, 08:14 PM   #6
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Quote:
Originally Posted by TUCSONRAIL View Post
It seems more of a problem with Spartan than Freightliner. Just read some of the threads on the Entegra form. 3 years and no problems on my FL.

Itís my understanding the def heads are manufactured by Shaw industries for both fl and spartan. It wonít matter what chassis you have
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Old 05-06-2021, 09:19 PM   #7
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One might think that Entegra are having more trouble with DEF but remember Entegra only built on Spartan chassis so they won't have FL DEF head problems. This problem is covering almost all HD diesel engines since 2016.
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Old 05-06-2021, 09:24 PM   #8
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I saw Tomís post about getting a extra def head to carry on the road. Makes sense, even though I have not had an issue on my FL chassis. Called Velocity and they said very few issues with def heads, so I ended up with a part number but no def head. Time will tell. Itís a Cummins item, I donít think the part is different, except where it is mounted on the chassis.
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Old 05-07-2021, 09:07 AM   #9
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Just replaced def head this week in my 20 MA. I thought I might avoid problems as we were one of the last coaches off the 2020 production line. Service center said it is happening on all FL and Spartans.
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Old 05-08-2021, 10:28 AM   #10
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There are a lot more Freightliner Chassis out there than Spartan, yet most of the failures seem to be on Spartan. Maybe they got a bad batch or something. Just saying.
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Old 05-08-2021, 02:51 PM   #11
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With Freightliner building over 65% of all Class A chassis across all lines you think Freightliner would have at least twice as many failures as any other chassis builder???
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Old 05-08-2021, 09:04 PM   #12
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Quote:
Originally Posted by TUCSONRAIL View Post
It seems more of a problem with Spartan than Freightliner. Just read some of the threads on the Entegra form. 3 years and no problems on my FL.


All Entegraís are on Spartan, so to the extent you read about a Def head failure on an Entegra, it will be on a Spartan.
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Old 05-08-2021, 09:09 PM   #13
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Went to the Diesel RV club rally at Distant Drums RV Resort in March of 2020. There was a Tech Talk on Def head failures. Of the fifty or so coaches there, about twelve reported Def head problems including me.

We took a poll. It was split with five on FL and seven on Spartan. I donít know the split between those two chassis in the entire population, but Iím sure some of those coaches were not on either FL or Spartan chassis since we had a Prevost, a Newell and several other brands in attendance.
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