Cleaner for the C250 CDI intake manifold

[WhisperingWillow]

I would greatly appreciate your assistance.
The carbon buildup on the swirl flaps necessitated the expensive replacement of my inlet manifold.

According to what I've heard, in order to prevent carbon buildup and short trips, I should spray a diesel intake cleaner like TB6601P at every service.

Unfortunately, the boost sensor located just before the inlet manifold—the ideal spot to spray the cleaner—is completely out of reach.
Another possible spot is the second boost sensor on the throttle body, immediately following the MAP sensor; however, this would require the cleaner to pass through the intercooler, which does not seem to be an efficient method.

Is anyone here with any suggestions for what to do next?

Much obliged

[johnmayerrr]

For my curiosity's sake, why were they replacing instead of simply cleaning?
It is extremely difficult, if not impossible, to spray into the intake while avoiding the turbo or intercooler. In any case, you'll need to spray the carbon buildup directly with most of those sprays for them to work. The most effective solution would be to install an oil catch can between the PCV and the turbo intake. This will prevent the oil from leaking into the intakes and will ensure that the PCV runs smoothly.

[WhisperingWillow]

Thank you for getting back to us.
Had to be replaced because we didn't know what was wrong with the swirl flaps before they were removed, and it took too long to order and receive them.

Time to clean the old Manifold at an hourly rate wasn't a big deal, and the Manifold was reasonably priced.

I will locate the catch-all space and option.
I think you can spray the intake cleaner into the intercooler pipe from underneath.
I am grateful.

[johnmayerrr]

Yes, you could remove it at the shutter valve (also known as an anti-shudder valve or throttle valve) and spray it in there from the top of the engine compartment. Another option is to use the hole behind the shutter valve, just below it, or the one through which the air intake temperature sensor sits. It's still quite a distance to the intake, but that's the closest easy point.

[WhisperingWillow]

I am grateful.
However, the om651 inlet manifold's swirl flaps serve as the shutter valve.
By "valve," did you mean this particular one?

[johnmayerrr]

Something new. Under the vacuum pump, on the front left side (when looking from the front), is where you can find the shutter valve/anti-shudder valve. It looks like a throttle valve, but CDIs don't actually have any. Its sole purpose is to create a vacuum when the engine is turned off (thus eliminating the thump heard on older diesels) and, on occasion, to partially close (again, to aid EGR flow), so that the engine does not overheat. The derv engine's speed is mostly unrestricted because the only controls are the duration and pressure of the injectors, not a throttle. A spray hole would be created by the easily detachable air intake temperature sensor located on the rear of the device.