BenzMW
Member
Ah, so I need to replace it with A6420101891?
Let's see how much mercedesofnewcastle sells it for
Let's see how much mercedesofnewcastle sells it for
OM642 PCV Upgrade
- Thread starter Larkone
- Start date
W1ghty
MB Enthusiast
If yours is original it’s well worth doing , it’s a consumable item .
W1ghty
MB Enthusiast
Oil Separator Breather Bleeder Valve for Mercedes G/R/S/E/ML/GL W463 W251 OM642 | eBay
642 010 21 91, 6420102191, A 642 010 21 91, A6420102191. 642 010 18 91, 6420101891, A 642 010 18 91, A6420101891. 642 010 20 91, 6420102091, A 642 010 20 91, A6420102091. -Our warranty is valid for max.
www.ebay.co.uk
BenzMW
Member
It costs around £99 from a Mercedes dealership. Might get that one, has anyone had any luck from the ebay one, they don't seem to have any branding on them?
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It looks like your green o-ring might have perished too, from the look of the 'leaks' near it...
BenzMW
Member
Which green o-rings are you referring too? Maybe I'm blind but I don't see it lol
W1ghty
MB Enthusiast
There is an orange one on the front of the turbo , the green one isn’t visible it’s elsewhere
BenzMW
Member
Ah ok, I misread Teddy's post. I'll take a closer look took tomorrow and see if I can find any other potential leak areas and get it sorted when I change the pcv. Thank you both 
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The green O-ring is in this intercooler pipe, see pic. From the look of the vapour marks, it looks like it needs changing. It's about 1/2 labour at an indie, if you are not sure how to do it yourself.
The air going through this pipe is under pressure, so if the o-ring isn't good, it will cause a splatter/spray of the oily vapour like in the pic.
Obviously disregard is this has been changed and the oily residue is old!
Cheers,
Ed
The air going through this pipe is under pressure, so if the o-ring isn't good, it will cause a splatter/spray of the oily vapour like in the pic.
Obviously disregard is this has been changed and the oily residue is old!
Cheers,
Ed
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BenzMW
Member
Thank you, valuable information for all! I'll definitely pick up an o-ring tomorrow, and have a go at doing it.
The old style orange seal on the PCV has a reputation for being sucked into the turbo (not good to feed turbos solids) which is why there was a new design.
And follow the rest of the intercooler pipework for misting at joints as there are other o-rings further along that can also leak like that. I had to replace two just behind the rad. Doing that certainly improved the pickup because I was no longer losing pressure. Use a wipe of silicone grease when fitting to avoid tearing them.
BenzMW
Member
Well, it was all going well until:
Anyone think it is super glue-able?
Anyone think it is super glue-able?
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Dremel it off and buy one of these?
turbozentrum.co.uk
Repair Kit Intake Mercedes Benz CDI OM642, £ 29.87
Mercedes Benz CDI OM642 repair kit for the t-hose of the intake.
BenzMW
Member
!
You're the man Teddy!
You're the man Teddy!
Can I ask how you sourced the PCV for only 25 euro? Do you have a link? I assume you have to go genuine MB or is there a manufacturer that supplies them so the same thing?
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I didn't - I bought it from MB and had to pay the £140 or whatever it was.
There's a slightly different design for the 265BHP version engines.
There's a slightly different design for the 265BHP version engines.
Ah ok, do you have part number for the 265Bhp versions?
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I'm afraid not - I might be mistaken but I think @MrGreedy just bought one?
I will wait and see how he gets on fitting to his. Great info here everyone, thanks.
MrGreedy
MB Enthusiast
Okay, so I've just fitted the 'upgraded' PCV for my E350 CDI. I fitted part A6420102491. This is for the 265bhp engine, not the 231bhp engine that has a plastic body for the PCV valve.
A6420102491 is the upgraded PCV/breather hose, with the new integrated orange seal with 'tabs' permanently clipped on to the PCV hose end. This is only updated in EPC for the ML, S-class and possible R class.
The 'upgrade' ONLY relates to the orange seal on the end where it connects to the batwing I believe, and eliminates the risk of the previous 'push on' seal getting sucked into the turbo.
The part fitted like a glove, and looks identical in every way to the part that was removed, except for the end seal.
I truly believe Merc have messed up here and neglected to flow this 'upgraded' PCV to the E-class, whilst they have flowed it out to the other Class of Mercs that use the exact same PCV and part numbers.
Side-by-side of the removed PCV and the new 'ML350 CDI' PCV
New PCV partially fitted down the back of the engine. I thought there was plenty of room to make this swap, but I did unbolt the bracket you can see to the left to allow me to get a hand and tools in more easily.
I cleaned up all the batwing and took the opportunity to replace the orange turbo inlet seal and the two orange eliptical air filter seals (the existing ones were either filthy, or brown!). I also inspected the air filters, which look pretty clean, so it will be another 12 months before I look at those again, but I did vac off from underneath (very important that way round) the big bits of debris that had got through (leaves, dandilion flowers etc).
All reassembled and cleaned up a little bit, including removing and cleaning the rubber oil filler catch collar, which had every sort of filth and detritus collecting around it. I thought better to do this now, that risk a load of it falling in come oil fill time.
Engine cover back on and cleaned up.
I need to do an engine bay detail at some point. It's on the never ending list!
A6420102491 is the upgraded PCV/breather hose, with the new integrated orange seal with 'tabs' permanently clipped on to the PCV hose end. This is only updated in EPC for the ML, S-class and possible R class.
The 'upgrade' ONLY relates to the orange seal on the end where it connects to the batwing I believe, and eliminates the risk of the previous 'push on' seal getting sucked into the turbo.
The part fitted like a glove, and looks identical in every way to the part that was removed, except for the end seal.
I truly believe Merc have messed up here and neglected to flow this 'upgraded' PCV to the E-class, whilst they have flowed it out to the other Class of Mercs that use the exact same PCV and part numbers.
Side-by-side of the removed PCV and the new 'ML350 CDI' PCV
New PCV partially fitted down the back of the engine. I thought there was plenty of room to make this swap, but I did unbolt the bracket you can see to the left to allow me to get a hand and tools in more easily.
I cleaned up all the batwing and took the opportunity to replace the orange turbo inlet seal and the two orange eliptical air filter seals (the existing ones were either filthy, or brown!). I also inspected the air filters, which look pretty clean, so it will be another 12 months before I look at those again, but I did vac off from underneath (very important that way round) the big bits of debris that had got through (leaves, dandilion flowers etc).
All reassembled and cleaned up a little bit, including removing and cleaning the rubber oil filler catch collar, which had every sort of filth and detritus collecting around it. I thought better to do this now, that risk a load of it falling in come oil fill time.
Engine cover back on and cleaned up.
I need to do an engine bay detail at some point. It's on the never ending list!
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