Mx13 EPA 13 sensor locations

Edjahman · Apr 13, 2021

spsauerland said: ↑

Here you go. Any questions ask. Have to pull air intake mixer pipe when pulling venturi tube to clean, so need new gasket where it bolts to cylinder head. Watch how you pull it out, can easily damage the rail pressure control valve connector (only did it once!). I have a brush that I clean venturi tube with first, then use scotch brite pad. I use pipe cleaners before blowing out the rifle drilled passages to the EGR delta P. The plugs are extremely tight and don't budge. The connector to EGR delta P sensor can be hard to get to, be gentle unlocking it. The temp sensor in intake manifold tends to seize in pretty good if hasn't been pulled in awhile. I use a little anti seize on it when reinstalling and they come out easy after that. DPF is exact same as Cummins.
Click to expand...

The before turbine pressure sensor tube. How does that come off? I took the bolt out of the upper right side underneath and it didn't want to budge so I left it alone because it made me too nervous.

I assume the bpv after tube is similar.

I did manage to pull the boost pressure sensor and clean that. It was actually in pretty decent shape.

The pressure sensor before turbine was also not too bad at all.

That's all I got to today.

Thank you for the information.

Edjahman · Apr 13, 2021

spsauerland said: ↑

Here you go. Any questions ask. Have to pull air intake mixer pipe when pulling venturi tube to clean, so need new gasket where it bolts to cylinder head. Watch how you pull it out, can easily damage the rail pressure control valve connector (only did it once!). I have a brush that I clean venturi tube with first, then use scotch brite pad. I use pipe cleaners before blowing out the rifle drilled passages to the EGR delta P. The plugs are extremely tight and don't budge. The connector to EGR delta P sensor can be hard to get to, be gentle unlocking it. The temp sensor in intake manifold tends to seize in pretty good if hasn't been pulled in awhile. I use a little anti seize on it when reinstalling and they come out easy after that. DPF is exact same as Cummins.
Click to expand...

So it looks like the EGR differential sensor is the one on the top front of the tube that crosses over the front of the motor.

I assume that's the venturi tube that the sensor is bolted to?

So it's best to completely remove it to clean the ports etc?

Thank you

Edjahman · Apr 13, 2021

spsauerland said: ↑

Here you go. Any questions ask. Have to pull air intake mixer pipe when pulling venturi tube to clean, so need new gasket where it bolts to cylinder head. Watch how you pull it out, can easily damage the rail pressure control valve connector (only did it once!). I have a brush that I clean venturi tube with first, then use scotch brite pad. I use pipe cleaners before blowing out the rifle drilled passages to the EGR delta P. The plugs are extremely tight and don't budge. The connector to EGR delta P sensor can be hard to get to, be gentle unlocking it. The temp sensor in intake manifold tends to seize in pretty good if hasn't been pulled in awhile. I use a little anti seize on it when reinstalling and they come out easy after that. DPF is exact same as Cummins.
Click to expand...

spsauerland said: ↑

Here you go. Any questions ask. Have to pull air intake mixer pipe when pulling venturi tube to clean, so need new gasket where it bolts to cylinder head. Watch how you pull it out, can easily damage the rail pressure control valve connector (only did it once!). I have a brush that I clean venturi tube with first, then use scotch brite pad. I use pipe cleaners before blowing out the rifle drilled passages to the EGR delta P. The plugs are extremely tight and don't budge. The connector to EGR delta P sensor can be hard to get to, be gentle unlocking it. The temp sensor in intake manifold tends to seize in pretty good if hasn't been pulled in awhile. I use a little anti seize on it when reinstalling and they come out easy after that. DPF is exact same as Cummins.
Click to expand...

I don't want to become a pain for asking too many questions.

This seems quite a bit more involved then the 4 sensors that I changed on my cummins x15 that I used to have.

I'm more then willing to keep plugging away at this because I really want to learn.

Besides I'm stuck with my mx13 for quite some time to come.

If it's running really great, is it still worth it to check and clean all of these?

I assume it's better to stay ahead of problems then just wait until it doesn't run properly.

Thank you.

You can tell me to enroll in paccar school if I'm too much.

Goodysnap · Apr 13, 2021

Your doing fine.

You can check the tubes on the truck. Run a piece of mechanics wire threw them or a can air duster can also help clean the components.

@spsauerland wasnt kidding about using his own lungs. Put a length of hose on the pipe or sensor port just push and seal with hand pressure. Blow threw the hose to ensure no pressure blockage. Removal and manual cleaning is the best possible long term outcome. I dont remove them either unless I suspect an issue with one of them.

The only thing your missing is the EGR cooler flush. Leave this one to the shop and special tools.

Edjahman · Apr 14, 2021

Goodysnap said: ↑

Your doing fine.

You can check the tubes on the truck. Run a piece of mechanics wire threw them or a can air duster can also help clean the components.

@spsauerland wasnt kidding about using his own lungs. Put a length of hose on the pipe or sensor port just push and seal with hand pressure. Blow threw the hose to ensure no pressure blockage. Removal and manual cleaning is the best possible long term outcome. I dont remove them either unless I suspect an issue with one of them.

The only thing your missing is the EGR cooler flush. Leave this one to the shop and special tools.
Click to expand...

Awesome. Thank you!

I actually found an independent shop in burkeville va the other week that works on paccar.

I was just talking to them about an egr cooler flush. No way I'd tackle that by myself.

Appreciate all of the help here a lot!

Thank you

spsauerland · Apr 19, 2021

Edjahman said: ↑

The before turbine pressure sensor tube. How does that come off? I took the bolt out of the upper right side underneath and it didn't want to budge so I left it alone because it made me too nervous.

I assume the bpv after tube is similar.

I did manage to pull the boost pressure sensor and clean that. It was actually in pretty decent shape.

The pressure sensor before turbine was also not too bad at all.

That's all I got to today.

Thank you for the information.
Click to expand...

To pop the sensing tube out for the exhaust gas pressure sensor before turbine, this is how I do it. Loosen the tube @ the exhaust manifold, usually fitting in manifold wants to turn so requires two 17 MM wrenches. Then take out bolt holding tube in turbo inlet pipe, 13 MM head. Next I remove the pressure sensor. Then, I use a 3/8" punch to tap the tube down.
Once o-rings is exposed, usually grap tube by hand and wiggle it loose. It's some sort of DIN flare fitting on manifold side. I always replace o-rings, if need P/N I can get it for you. To pop tube back in, I lube both sides with small amount of anti-seize. Start the side to manifold first a turn, then grab a long pry bar to leverage against manifold bolt to get it back in.
Works good for me!
Sorry took awhile to respond, I don't get on here as much lately. I was happening to be working one today so snapped the pictures. This truck has just rolled over 500,000 miles and is getting it's 2nd DPF cleaning. On our EPA 13 tractors, I also clean the EGR cooler @ the second DPF cleaning. Actually pretty easy to remove on EPA13 and 17's. Same place the cleans our DPF's will flush our EGR coolers with same flush as Paccar cleaner, then ultrasonically clean it, then put in kiln for final clean for $150.00. They come back very clean.

Edjahman · Jun 3, 2021

spsauerland said: ↑

To pop the sensing tube out for the exhaust gas pressure sensor before turbine, this is how I do it. Loosen the tube @ the exhaust manifold, usually fitting in manifold wants to turn so requires two 17 MM wrenches. Then take out bolt holding tube in turbo inlet pipe, 13 MM head. Next I remove the pressure sensor. Then, I use a 3/8" punch to tap the tube down. View attachment 368124
Once o-rings is exposed, usually grap tube by hand and wiggle it loose. It's some sort of DIN flare fitting on manifold side. I always replace o-rings, if need P/N I can get it for you. To pop tube back in, I lube both sides with small amount of anti-seize. Start the side to manifold first a turn, then grab a long pry bar to leverage against manifold bolt to get it back in. View attachment 368125
Works good for me!
Sorry took awhile to respond, I don't get on here as much lately. I was happening to be working one today so snapped the pictures. This truck has just rolled over 500,000 miles and is getting it's 2nd DPF cleaning. On our EPA 13 tractors, I also clean the EGR cooler @ the second DPF cleaning. Actually pretty easy to remove on EPA13 and 17's. Same place the cleans our DPF's will flush our EGR coolers with same flush as Paccar cleaner, then ultrasonically clean it, then put in kiln for final clean for $150.00. They come back very clean.
Click to expand...

Thank you for the information!

Edjahman · Jun 27, 2021

So I finally checked all of the air management sensors and cleaned them etc.

I also got the EGR cooler flushed.

Thank you very much for the information!

spsauerland said: ↑

To pop the sensing tube out for the exhaust gas pressure sensor before turbine, this is how I do it. Loosen the tube @ the exhaust manifold, usually fitting in manifold wants to turn so requires two 17 MM wrenches. Then take out bolt holding tube in turbo inlet pipe, 13 MM head. Next I remove the pressure sensor. Then, I use a 3/8" punch to tap the tube down. View attachment 368124
Once o-rings is exposed, usually grap tube by hand and wiggle it loose. It's some sort of DIN flare fitting on manifold side. I always replace o-rings, if need P/N I can get it for you. To pop tube back in, I lube both sides with small amount of anti-seize. Start the side to manifold first a turn, then grab a long pry bar to leverage against manifold bolt to get it back in. View attachment 368125
Works good for me!
Sorry took awhile to respond, I don't get on here as much lately. I was happening to be working one today so snapped the pictures. This truck has just rolled over 500,000 miles and is getting it's 2nd DPF cleaning. On our EPA 13 tractors, I also clean the EGR cooler @ the second DPF cleaning. Actually pretty easy to remove on EPA13 and 17's. Same place the cleans our DPF's will flush our EGR coolers with same flush as Paccar cleaner, then ultrasonically clean it, then put in kiln for final clean for $150.00. They come back very clean.
Click to expand...

Edjahman · Jul 17, 2021

I appreciate you guys on the forums a lot!

Sanders24 · Mar 5, 2025

Hello everyone, so i got a quick question, does a paccar mx13 of a KW T680 have a sensor call like "Time sensor" or something like that?

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