Thinking of doing a rebuild on a DD15? DONT!

supatrucka72 · Mar 14, 2022

smokin joe720 said: ↑

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
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supatrucka72 · Mar 14, 2022

You have an oring on a cylinder that has gone bad most likely from an overfueled injector and it’s allowing antifreeze into your oil. You may not see the actual evidence of the coolant in your oil but I can almost guarantee that’s where it’s going. Get an oil sample done asap and start looking for quotes on a rebuild.

armo · Jul 2, 2022

supatrucka72 said: ↑

You have an oring on a cylinder that has gone bad most likely from an overfueled injector and it’s allowing antifreeze into your oil. You may not see the actual evidence of the coolant in your oil but I can almost guarantee that’s where it’s going. Get an oil sample done asap and start looking for quotes on a rebuild.
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overfueling injector will not cause o ring failure.

Kingmar7294 · Feb 15, 2023

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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Question have you seen issue with 2018 dd-15 with the o rings and the pick up tube heard the updated them ?

jims34 · Dec 2, 2023

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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So valve seat failures are a problem hmmm I was told that is a problem with my engine they adjusted the valves and they were out of wack within a month so my question is this it takes about 30 hours to do the heads would it make sense to do an infame? engine has 800000 miles on it. I am leaning that way

gekko1323 · Dec 3, 2023

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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Where is Stewart and Stevenson?

gekko1323 · Dec 3, 2023

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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Is your shop in Wichita Falls? What's the name?

JoeyJunk · Dec 3, 2023

gekko1323 said: ↑

Where is Stewart and Stevenson?
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Our Locations - Stewart & Stevenson

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