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Thinking of doing a rebuild on a DD15? DONT!

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by 1dan, May 4, 2018.

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Speedingticket Bobtail Member

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Dieselfixxer said: ↑

It seems like Detroit has gotten most of the issues with the DD15 fixed, and most shops are aware of the common issues. The pickup tube o-rings getting hard and leaking is very common, but they don't immediately fail. You will start to lose oil pressure, and it's up to the driver to pay attention and see that there is a problem BEFORE you completely lose it. Another problem is the fuel injectors. We've been seeing a LOT of injector failures around 250k-300k. Pre GHG17 motors will not set a fault for overfueling injectors, and there are not any tests that Detroit has approved for testing. A good sign that you have an issue is when you start to have constant issues with the aftertreatment. An overfueling injector will cause the One Box to fail if not caught in time. A good rule of thumb is if you do have to replace the One Box, also put a 6 pack in. Also, I've had to put a single cylinder in multiple engines due to an overfueling injector. The cylinder will get so hot that it will melt the bottom O-ring on the liner and cause coolant to drop into the oil. Detroit has acknowledged that there is a problem with the injectors, but they have not figured out a solution as of yet. They have acknowledged that they should have a service interval of 250k, but they will not document that because then they would be paying for injectors to be replaced under warranty. One last issue we have been seeing more of are valve seat failures. In the last two months, we've had three engines come in with a misfire and have found the valves stuck in the heads. This is fairly new and they're happening after about 750k. I'm a lead engine guy at my shop, so I make sure everything that has a measurement is checked. I also make sure the other engine builders check they're stuff. So many people don't know how to set an overhead adjustment, measure liner protrusion, mike out a liner or a crankshaft journal, etc. Engine building is an art. Yeah, anyone could tear down and put back together an engine, but you reallly need to know what you're doing to make sure that there are not any issues with it and to find out what CAUSED the failure. If anyone needs any help or advice on a Detroit engine (60 Series or DD), Caterpillar, or Cummins (ISB-ISX) then just reach out to me. My specialty is engines, mainly Cummins and Detroit.
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Dieselfixxer said: ↑

It seems like Detroit has gotten most of the issues with the DD15 fixed, and most shops are aware of the common issues. The pickup tube o-rings getting hard and leaking is very common, but they don't immediately fail. You will start to lose oil pressure, and it's up to the driver to pay attention and see that there is a problem BEFORE you completely lose it. Another problem is the fuel injectors. We've been seeing a LOT of injector failures around 250k-300k. Pre GHG17 motors will not set a fault for overfueling injectors, and there are not any tests that Detroit has approved for testing. A good sign that you have an issue is when you start to have constant issues with the aftertreatment. An overfueling injector will cause the One Box to fail if not caught in time. A good rule of thumb is if you do have to replace the One Box, also put a 6 pack in. Also, I've had to put a single cylinder in multiple engines due to an overfueling injector. The cylinder will get so hot that it will melt the bottom O-ring on the liner and cause coolant to drop into the oil. Detroit has acknowledged that there is a problem with the injectors, but they have not figured out a solution as of yet. They have acknowledged that they should have a service interval of 250k, but they will not document that because then they would be paying for injectors to be replaced under warranty. One last issue we have been seeing more of are valve seat failures. In the last two months, we've had three engines come in with a misfire and have found the valves stuck in the heads. This is fairly new and they're happening after about 750k. I'm a lead engine guy at my shop, so I make sure everything that has a measurement is checked. I also make sure the other engine builders check they're stuff. So many people don't know how to set an overhead adjustment, measure liner protrusion, mike out a liner or a crankshaft journal, etc. Engine building is an art. Yeah, anyone could tear down and put back together an engine, but you reallly need to know what you're doing to make sure that there are not any issues with it and to find out what CAUSED the failure. If anyone needs any help or advice on a Detroit engine (60 Series or DD), Caterpillar, or Cummins (ISB-ISX) then just reach out to me. My specialty is engines, mainly Cummins and Detroit.
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Hi, just curious on your advice, since it's your specialty. im looking at two trucks a Freightliner Cascadia DD15 with 505000 and a Prostar ISX15 with 370000. Which is ther better truck in your opinion? I know there will be several other determining factors, but just an overall opinion? thx

Speedingticket, Jan 4, 2019

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Wannabe tech Light Load Member

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ast26909 said: ↑

What are the problems? Parts unavailable? Too expensive?
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Customers coming to a indy shop are searching for value, i only trust volvo mack parts. I cant get them cheap.....

Wannabe tech, Jan 4, 2019

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steven76 Light Load Member

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I have a dd15 engine. This have 1.2milion miles. The truck in great shape. I own it longtime ago. I have new Starter new fuel pump new injectors new waterpump and I wanna rebuild the engine. My mechanic said he can give me 6 month warranty or 80 000 Miles warranty. I may wanna get new turbo and new air-compressor. Overhaul kit is 6500. Labor 6000. So I will end it up with $16500. It’s a def free engine. I just don’t wanna waste 60k for a truck with 500k Miles. On that half way trucks need a lot of work I only wanna drive 2 more years. That’s all. Like 200k. What you think ? It is good idea ?

steven76, Jun 9, 2019

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starmac Road Train Member

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80,000 seems like an odd number for warranty purposes.
I know nothing about the dd15, except the one that followed me to prudhoe and back this trip impressed me.
When I had my series 60 rebuilt I took it to stewart and stevenson, price was as good as anybodys, better than most and it came back with a 300,000 mile warranty.

starmac, Jun 9, 2019

#34

gekko1323 Thanks this.
steven76 Light Load Member

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Actually warranty is 100k but this is usa so I always think 20% is always lie. Real parts and labor is :

$5500 labor
$5800 parts
Warranty 100k

I wish I have 60 series engine at my garage ...
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steven76, Jun 9, 2019

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BoxCarKidd Road Train Member

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starmac said: ↑

80,000 seems like an odd number for warranty purposes.
I know nothing about the dd15, except the one that followed me to prudhoe and back this trip impressed me.
When I had my series 60 rebuilt I took it to stewart and stevenson, price was as good as anybodys, better than most and it came back with a 300,000 mile warranty.
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I thought the same thing at first. 80,000 miles is about what one can log in six months. If the truck is slip seated the mileage could be much higher. Maybe he got burned once.
Cummings used to do a Now I : One year 100,000. Now II : 2 yr 200,000 or a Now III : 3 yr or 300,000 miles. The company I worked for was having 2's done as they would sell them before the third year.
Regardless of any of that I would get it rebuilt somewhere and run it two more years.

BoxCarKidd, Jun 11, 2019

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JAD1024 Light Load Member

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Dave_in_AZ said: ↑

I know these dudes that dropped the pick up tube, guess this is pretty common, and spun a main.

They got it reworked, back in truck, $18K.

Not long ago. I'm curious to see how long it lasts as well.
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So what happened

JAD1024, Mar 10, 2021

#37
Dave_in_AZ Road Train Member

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JAD1024 said: ↑

So what happened
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I know it ran for awhile. The dude that did a lot of work on my truck quit the place, so now I'm out of the loop.

Dave_in_AZ, Mar 10, 2021

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smokin joe720 Bobtail Member

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Dieselfixxer said: ↑

It seems like Detroit has gotten most of the issues with the DD15 fixed, and most shops are aware of the common issues. The pickup tube o-rings getting hard and leaking is very common, but they don't immediately fail. You will start to lose oil pressure, and it's up to the driver to pay attention and see that there is a problem BEFORE you completely lose it. Another problem is the fuel injectors. We've been seeing a LOT of injector failures around 250k-300k. Pre GHG17 motors will not set a fault for overfueling injectors, and there are not any tests that Detroit has approved for testing. A good sign that you have an issue is when you start to have constant issues with the aftertreatment. An overfueling injector will cause the One Box to fail if not caught in time. A good rule of thumb is if you do have to replace the One Box, also put a 6 pack in. Also, I've had to put a single cylinder in multiple engines due to an overfueling injector. The cylinder will get so hot that it will melt the bottom O-ring on the liner and cause coolant to drop into the oil. Detroit has acknowledged that there is a problem with the injectors, but they have not figured out a solution as of yet. They have acknowledged that they should have a service interval of 250k, but they will not document that because then they would be paying for injectors to be replaced under warranty. One last issue we have been seeing more of are valve seat failures. In the last two months, we've had three engines come in with a misfire and have found the valves stuck in the heads. This is fairly new and they're happening after about 750k. I'm a lead engine guy at my shop, so I make sure everything that has a measurement is checked. I also make sure the other engine builders check they're stuff. So many people don't know how to set an overhead adjustment, measure liner protrusion, mike out a liner or a crankshaft journal, etc. Engine building is an art. Yeah, anyone could tear down and put back together an engine, but you reallly need to know what you're doing to make sure that there are not any issues with it and to find out what CAUSED the failure. If anyone needs any help or advice on a Detroit engine (60 Series or DD), Caterpillar, or Cummins (ISB-ISX) then just reach out to me. My specialty is engines, mainly Cummins and Detroit.
Click to expand...

hello i just had a 2014 cascadia start losing antifreeze no signs of a leak outside of engine and not smoking no antifreeze in the oil engine running as normal except for this issue and it started blowing oil from the blowby tube on the passenger side

smokin joe720, Jun 29, 2021

#40

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