Typical Regen for you

[mdixon]

So I do the emissions work at the farm, and as such I tend to do a lot of forced regens and data logging. This is the best heat I've had all week.

 

How about you? What do you look for in a regen before deciding to take a closer look? I'm not a mack mechanic, nor do I have any formal training. It's all been learned I  the seat or from whatever I can get my hands on.

 

Edited January 27, 2023 by mdixon

[mdixon]

2 other issues this week.

 

 

Edited January 27, 2023 by mdixon

[BOBWhite]

Volvo/mack I think uses cummins DPF components so you know one DPF system you know just about all of them. Detroits are a bit different but same basic concept. 

I have a basic understanding of cat's and cummins system but never worked on one. Do mack's use an 8th injector or do they use the engine injectors to inject fuel into the exhaust stroke? 

 

[mdixon]

25 minutes ago, BOBWhite said:

Volvo/mack I think uses cummins DPF components so you know one DPF system you know just about all of them. Detroits are a bit different but same basic concept. 

I have a basic understanding of cat's and cummins system but never worked on one. Do mack's use an 8th injector or do they use the engine injectors to inject fuel into the exhaust stroke? 

 

Ours have a "denoxtronic" system, whatever that is. Maybe bosch? They use an exhaust mounted HCI to create heta for the regen.

[Onyx610]

It’s a def supply module. Takes fluid from tank and pressurizes it. 

[Onyx610]

Your temps look good too

[Onyx610]

1 hour ago, BOBWhite said:

Volvo/mack I think uses cummins DPF components so you know one DPF system you know just about all of them. Detroits are a bit different but same basic concept. 

I have a basic understanding of cat's and cummins system but never worked on one. Do mack's use an 8th injector or do they use the engine injectors to inject fuel into the exhaust stroke? 

 

Yea, they use the After-treatment Hydrocarbon Injector AHI/7th injector. 

Edited December 1, 2022 by Onyx610
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[mdixon]

4 minutes ago, Onyx610 said:

Your temps look good too

That's after replacing the EGR j pipe gaskets I messed up. 

[Onyx610]

Those gaskets suck on the hot pipe! We just talked about a tool to make to test the system before putting it back together in the one thread you posted pics of the n14. However those should not affect regen temps as egr valve should be closed at regen. 

Edited December 1, 2022 by Onyx610
Spelling

[BOBWhite]

6 minutes ago, Onyx610 said:

It’s a def supply module. Takes fluid from tank and pressurizes it. 

Do they have an electric Def pump or do they use onboard air to pressurize it like the old systems? And oops I meant 7th injector, I don't know what I was thinking 

[Onyx610]

Got this idea from Mackpro/FJH, mine is just different than theirs. It’s a piece of egr cooler hose, a pvc cap, and air fitting threaded in it and epoxied. Stick it on the cold side of cooler and put 40psi of regulated air to it and you can check for exhaust leaks up to the valve and or check to see if valve is open. Also check for cooler coolant leaks. That way you don’t have to keep taking the diffuser pipe off and fighting with all the other shit. 
 

[mdixon]

14 minutes ago, Onyx610 said:

Those gaskets suck on the hot pipe! We just talked about a tool to make to test the system before putting it back together in the one thread you posted pics of the n14. However those should not affect regen temps as egr valve should be closed at regen. 

They also cause boost leaks, which pisses off the computer with a drv 

[mdixon]

11 minutes ago, BOBWhite said:

Do they have an electric Def pump or do they use onboard air to pressurize it like the old systems? And oops I meant 7th injector, I don't know what I was thinking 

Engine fuel supply, so engine fuel pressure. These have air mixing tees on the injectors, but it's regulated to 30psi so half of running fuel pressure during regen

[Onyx610]

The ahi module has air supply to it for the 7th injector. Really important to keep up on air dryers on these. Thank god they got rid of that valve. 

Edited December 1, 2022 by Onyx610

[Onyx610]

19 minutes ago, mdixon said:

They also cause boost leaks, which pisses off the computer with a drv 

Haven’t seen that yet, interesting. Either way no egr flow doing regen. That will cause a big boost leak/loss of heat. 

[mdixon]

44 minutes ago, Onyx610 said:

Got this idea from Mackpro/FJH, mine is just different than theirs. It’s a piece of egr cooler hose, a pvc cap, and air fitting threaded in it and epoxied. Stick it on the cold side of cooler and put 40psi of regulated air to it and you can check for exhaust leaks up to the valve and or check to see if valve is open. Also check for cooler coolant leaks. That way you don’t have to keep taking the diffuser pipe off and fighting with all the other shit. 
 

Should there be any leakage by the egr valve at all? I made one of these with a pvc bushing and some threaded pipe adapters and every egr valve leaks that I've tested. I didn't test the brand new one that left the shop last week though.

[Onyx610]

Leaking at the gasket?

[Onyx610]

But no there should not be, these valves are notorious for taken a shit. 

[mdixon]

So no leakage into the exhaust manifold at all?

[Onyx610]

Nope 

[mdixon]

Huh, ok!

[mdixon]

I won't be allowed to change em until they throw EGR mass flow codes

[Onyx610]

These valves can cause a mess of issues if stuck open. Like face plugged dpfs

[Onyx610]

You may not even have that much leakage. Valve may not seal perfectly anyway 

[mdixon]

1 minute ago, Onyx610 said:

These valves can cause a mess of issues if stuck open. Like face plugged dpfs

I believe it, I've been dealing with these on a revolving door basis for a while.