Diesel intake manifold cleaning | BMW M47D20

In this video I go through the full process of removing, stripping down, cleaning, reassembling, and re-installing the intake manifold on an M47D20 powered BMW 320td. One man, one day job.
0:00 Removing the intake manifold
10:02 Preparing for cleanup
13:30 Cleaning
19:37 Before vs After
20:38 Intake ports cleaning
21:07 Cleaning the swirl flaps
21:30 Thoughts on swirl flaps
22:22 Reassembling the intake manifold
25:05 Vacuuming the intake ports
25:27 Reinstalling the manifold
26:56 Will it run?
27:39 I'm tired

[@mohammadbenattia9102]

Great effort, good results, cheers

[@krustysfunbodegas]

Nice job, step by step.. I need to do this on my 318 td Compact👍👍

[@joeferreira657]

Fantastic job, great video.
Thank you, would recommend you to anyone.
True pro,worth every penny.
Cheers

[@MaxstaR90]

Thank you for this video, keep on.
Greetings from Germany

[@alexderkach_]

Danke schön!

[@martindennehy3030]

Cheaper to just buy a new one, you need to have the water hot and a small nozzle to reach in the ports.

[@Enrico.15]

did you noticed a difference while driving with the clean manifold?

[@alexderkach_]

Absolutely no difference

[@Enrico.15]

@@alexderkach_ thank you!

[@zdzichuforker3652]

You don't remove the flaps?
Everyone used to delete it, but I see that recently people are going back to the original...

[@alexderkach_]

I explain this in the video, but basically:
The car has 500.000km and the swirl flaps, apart from having lots on carbon build up on them, are fine. But why? Well, in my case is because they've been disconnected at the actuator level. The little vacuum hose that goes from the control valve to the swirl flap actuator is cracked, so the swirl flaps never move, they stay in the OPEN position all the time. In this position, they experience minimum drag from the intake air, so the risk of any of them getting loose and entering into the combustion chamber is minimal. Apart from that, my car has not been remapped. So the levels of boost are stock or even below stock. And on top of that, as I mention in the video, the little screws the hold the swirl flaps are riveted from the back. I tried unscrewing one of them and I had to apply A LOT of force in order to get it out, deforming the back of the screw in the process.
So with all that said, I'm pretty confident the flaps are not going to cause any issues whatsoever. And even if something does go wrong, the one that's going to fail will be the one I tried to unscrew.

[@landuXD]

the engine seems a bit shaky at idle it has a bit of a weird circular motion to it, maybe have to check the engine mounts

[@alexderkach_]

Thanks for pointing this out. Yes, the engine mounts are gone, but the weird circular motion you see on video is actually due a phenomenon called "aliasing", because the camera is sampling the video at 30fps. In real life, the engine shaking is more violent and it oscillates at a higher frequency.

[@landuXD]

@@alexderkach_ very interesting, I also heard a vibration in the interior which lead me to believe it was engine mounts

[@alexderkach_]

The vibration you heard from the interior is, in part, because of the worn out engine mounts, and also because of trim pieces of the interior that got loose over time. BMW made these cars to be very reciclable by using some kind of glue to put a lot of stuff together. This car spent 20+ years living in the hot and sunny Spain, so the glue got so dry that it stopped glueing. As a result, the door pockets for example, get loose and start resonating with the low frequency vibrations that come from the engine at idle (which is, once more, exaggerated by having collapsed engine mounts).
But, when you cruise at normal speeds, with the engine sitting at 2200 rpm - you hear nothing. I kinda go into this in a video I made called 'it's not just a "rattle"'.

[@derin111]

Great video! Very clear and helpful. I want to do this on my M57 engine and presume it’s pretty much the same with two extra cylinders?

[@alexderkach_]

Thanks! Yes, the M57 is pretty much the same but (as some people say) with the correct amount of cylinders

[@triochalas]

Nice results although not cleaning the intake ports means that the airflow will still be restricted. Also you should really consider doing flaps delete, its a straight up upgrade. Also might want to look into EGR delete, it's a little more complicated but 100% worth it. My m57 feels like a totally different engine after that.

[@davidsdk8769]

Compact?

[@alexderkach_]

Yes

[@mannine99]

you need hazmat suit to do this job

[@antoniomartingarcia6229]

are u ukranian?

[@denisovanhybrid9610]

No