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OM642 CLS 350 Turbo oil seal?

Technoholic

Active Member
Joined
Dec 11, 2019
Messages
219
Location
Bucks
Car
CLS 350 SB, TVR Tuscan
Hi

I recently bought my CLS and I've been going through the past paperwork in detail. I've found a health check from last year which was clear apart from an amber advisory on Turbo Oil Seal. I don't have any more details and looking at the work carried out at the same time, it doesn't appear to have been resolved. Which seal is this going to be? I have read about the PCV uprated seal but not sure if this relates to the same and if it's something I can do myself? I need to do an injector leak off test so if it's something that can be done at the same time that would be good.

any advice welcomed. Thanks
 
Hi

I recently bought my CLS and I've been going through the past paperwork in detail. I've found a health check from last year which was clear apart from an amber advisory on Turbo Oil Seal. I don't have any more details and looking at the work carried out at the same time, it doesn't appear to have been resolved. Which seal is this going to be? I have read about the PCV uprated seal but not sure if this relates to the same and if it's something I can do myself? I need to do an injector leak off test so if it's something that can be done at the same time that would be good.

any advice welcomed. Thanks
It'll be the orange turbo inlet seal, if you take the engine cover off you will see the plastic Y duct which goes from the turbo to both airboxes (one each side of engine) where this duct is attached to the turbo it's uses a orange seal which leaks oil and needs changed

Sent from my Pixel 3 using Tapatalk
 
Hi

I recently bought my CLS and I've been going through the past paperwork in detail. I've found a health check from last year which was clear apart from an amber advisory on Turbo Oil Seal. I don't have any more details and looking at the work carried out at the same time, it doesn't appear to have been resolved. Which seal is this going to be? I have read about the PCV uprated seal but not sure if this relates to the same and if it's something I can do myself? I need to do an injector leak off test so if it's something that can be done at the same time that would be good.

any advice welcomed. Thanks

The seal's are very simple you can do them yourself.

Look around there are several video's on line

Change both the large one intake and if not already the PCV that has the newer seal design with the ears and factory installed metal band.

If the small PVC seal gets sucked into the turbocharger it will be a VERY expensive repair. Compared to $115.00 PCV valve assembly, yes MB does not sell the NEW designed seal by itself.

Regards

Joseph~
 
It'll be the orange turbo inlet seal, if you take the engine cover off you will see the plastic Y duct which goes from the turbo to both airboxes (one each side of engine) where this duct is attached to the turbo it's uses a orange seal which leaks oil and needs changed

Sent from my Pixel 3 using Tapatalk

The seal's are very simple you can do them yourself.

Look around there are several video's on line

Change both the large one intake and if not already the PCV that has the newer seal design with the ears and factory installed metal band.

If the small PVC seal gets sucked into the turbocharger it will be a VERY expensive repair. Compared to $115.00 PCV valve assembly, yes MB does not sell the NEW designed seal by itself.

Regards

Joseph~

I'm not being lazy but I seemingly couldn't find a good video showing this. Is the PCV seal the orange one?
 
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Thanks, I read on another site that the PCV hose assembly with the new type seal is easy to change on the 320 because the other end is easily accessible but on the 350 it disappears down the back of the engine. Is this true and if so, does that make it a pain to change? The main inlet seal appears to be quite easy it seems.
 
Review they following three;

Link:
pvc mercedes benz most over looked - YouTube

video
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So I've learnt that as I have the 265hp 350, the crankcase breather valve is not in the same position as in the 320 or the 231hp 350, it's tucked behind the engine. As it is, I don't think I need to replace the valve, just the seal on the end of the hose, but there doesn't seem to be an upgraded design that I can find for the seal on this version of the hose.
 
MB Part number W0133-2047027 Engine Crankcase Vent Valve

41DVQQsNkaL._SX425_.jpg


It is your money.

Less than $200.00 for a PVC or as MB call's them "Engine Crankcase Vent Valve"

or

$2,000.00{probably more] for a turbocharger, from the rubber seal being sucked into the turbocharger.

It is your money!
 
where did you find that? I'm looking at the parts catalog now for the 642.853 engine in my car and I don't see that listed as an upgraded part
 
that's just a google search, I mean how did you find out this was correct for my engine? I can't find any reference to it against my engine online

Edit: It appears that is for the US versions with the Bluetec treatment, not listed for my UK car
 
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So I've learnt that as I have the 265hp 350, the crankcase breather valve is not in the same position as in the 320 or the 231hp 350, it's tucked behind the engine. As it is, I don't think I need to replace the valve, just the seal on the end of the hose, but there doesn't seem to be an upgraded design that I can find for the seal on this version of the hose.

The upgraded seal comes as as part of the PCV valve because it is clamped onto the hose as part of the manufacturing process - as per pic from ullwn. PCV valves have a rubber diaphragm which degrades / goes hard with time and heat so there is value in replacing the whole thing. The clamp stops the seal being sucked into the turbo (a known problem) so if yours doesn't have one then there is extra value changing the PCV valve and not destroying your turbo and possibly other parts downstream - like the engine as the turbo disintegrates. Peace of mind is a good thing.
 
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that's just a google search, I mean how did you find out this was correct for my engine? I can't find any reference to it against my engine online

Edit: It appears that is for the US versions with the Bluetec treatment, not listed for my UK car

Dead give away givin that hes answering in dollars not pounds .
 
This has all been discussed this last week on this forum. Current page 2 in the general discussion.

OM642 PCV Upgrade

OM642 Green O-Ring replacement instructions?

I spent a lot of time listing part numbers for seals for the 265bhp engine. It explains the differences between the PCV pipes on the earlier and later engines. Should have everything you need.
 
This has all been discussed this last week on this forum. Current page 2 in the general discussion.

OM642 PCV Upgrade

OM642 Green O-Ring replacement instructions?

I spent a lot of time listing part numbers for seals for the 265bhp engine. It explains the differences between the PCV pipes on the earlier and later engines. Should have everything you need.

Thanks this is good information. Seems to confirm as I thought that there isn’t an upgraded pcv hose with the clamped on seal for the 265hp engine. Does that seem right?
 
I have the early 265bhp engine. I don't know if there are later differences.
A parts search doesn't mention W0133-2047027 at all looking though the online parts catalogue and it looks like the hose with the original seal without being clamped on to the pipe. I don't know if it's vehicle specific, or an update that's only available in the US, or that the online parts catalogue is out of date. The only option is to call the dealer I think. I might do this and update the forum, as this would be useful to confirm .
 
I just emailed MB parts in Newcastle where I just ordered some other bits from and they confirmed that
A6420101791 is the latest host assembly for my car, which doesn’t have a clamped on seal,
A6420160330 is the connector assembly at the end of the hose which comes with a new seal so I guess you’d need to buy that if you just wanted to change the seal.
 
My engine is 642.852.
Just been on the phone with an incredibly grumpy parts person who clearly thought I didn't have a clue what I was talking about and they know best (pretty typical when phoning Mercedes parts in my experience).

A6420101791 - Breather hose with aluminium valve. £114 including VAT. This original fit part is the latest part number and not superceded.
A6420940580 - this is the seal that 'can get sucked into the turbo' on the end of the PCV pipe where it connects to the turbo inlet pipe. This is also original fit on this engine, and has not been superceded either. However, it IS the same part number as the problem seal on the older engines e.g. E320 CDI 642.920.

W0133-2047027 - this is the part where the guy got really annoyed. He said it's not a Mercedes part number, and definitely not in Europe.
Also, if I put this part number into the online Merc catalogues, it says not recognised.
I suspect that either this is region specific (US), or actually an aftermarket mod? In any event, it's not available in the UK.
The revised seal with extra long body to allow the clamping is not available anywhere as far as I can tell.

The only option to get the modified seal for the E350 would seem to be to buy the full modified pipe from the older engine (£75 to £110, part number A6420100591 and Chrysler part number K05175514AB), and then cut off the factory jubilee clip and take the modified seal off and fit to a new PCV pipe (£114).

Upgraded pipe for the older engine for £74.99 on eBay:
Mercedes C320 CDI 3.0L PCV Oil Separator PCV Valve K05175514AB, A6420100591 | eBay

Total bill for DIY is circa £200, but would eliminate the seal sucked into turbo risk.
Strange that Merc have modified the older engine PCV seal, but not the newer engines when it is exactly the same part number.
Need to consider if I need to spend £200 on this at the moment. What a pain!
 

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