A/C condenser pipe rings

[Tomkinsm]

Hi,

I have a leak on my A/C system - 2003 W203 C180K. I had it leak tested and it seems the leak is where the two hoses fit into the condenser - presumably one of the o-rings are damaged, so I'd like to change both of them.

Can anyone tell me the sizes of the o-rings on these pipes? I've searched online - I can find pipe's and guides on changing the condenser, but can't find the o-ring specs anywhere. I'm aware of the importance of correct sizing and materials.

Thanks for any help.

 

[star]

Just go to mercs, save the hassle and cost peanuts.

 

[Tomkinsm]

Thanks Star,

Yes, was planning to go to them next week, but wasn't sure if they would sell the individual o-rings or just the complete pipe assy...

If I get them, I'll post the details for others.

 

[Richard Moakes]

Chassis Number? I will see if I can find the part numbers for you.

 

[Tomkinsm]

Thanks Richard - VIN WDC2030462R111268

 

[Richard Moakes]

You will need 2 x A2209970245 size is 9.5 x 2.5 and needs to be HNBR to be compatible with R134a

Lubricate the seals with refrigerant oil, or preferably Nylog Blue, which is amazing stuff and will prevent this kind of leak in the future

Nylog Blue HFC Gasket/Thread Sealant RT201B Evomart

Nylog Blue is an elastic fluid made from synthetic refrigeration grade compressor oil. Used as a assembly lube in internal system components.

www.evomart.co.uk

 

[Tomkinsm]

Great, thanks a lot!

 

[Tomkinsm]

I called Mercedes yesterday to check they had stock of the orings. I gave them my vehicle details and told them what I wanted, and checked against the part number you gave me, Richard, and they said that was correct. They put them aside for me to collect.

When I collected them today, I noticed the part number is different - MA0209977645. Just measured them - 9.5 x 2.6...

Strange. I wonder if Merc have updated/rationalised. 0.1mm difference might give bit more compression on the oring, but probably ok.

 

[Richard Moakes]

The slight difference in the part number indicates a modification, so the change from 02 to 76 usually means a supercession or change of supplier.

I doubt 2.5 vs 2.6 will make much difference, but be sure to lubricate the seal before trying to use it.

The Mercedes-Benz Parts Numbering System

Each Mercedes-Benz spare part is assigned an identification number,
used for ordering the part. These part numbers follow an ordered system,
as the following:

1-Basic Numbering
2-Sorting order
3-Letter prefixes
4-Suffix Numbers

Lets swim to little details about each.

1-Basic Numbering
The most common part number has 10 digits and a letter prefix “A”. Such a part number is written as follows:
A 117 030 10 17
Note the spacing and grouping of the digits. When spoken, you say it as it’s written, like “A- one-seventeen, oh-thirty, ten, seventeen”. Most people used to MB part numbers will say it that way, and saying it differently tends to confuse.

Each section has a distinct meaning:

A Prefix for Passenger Car parts. Other prefixes (such as B, C, N and W) are explained below.
117 Type Number – This is the internal type designation indicating which vehicle type for which this part was first designed. Parts may be (and often are) used in other types. Some parts use other numbers unrelated to model types.
030 The parts group number. Major group 03 corresponds to the EPC group to which the part generally belongs. The third digit indicates (broadly) the type of part from that group.
10 Modification Number. This identifies the modification status or variant of the part. The first version or variant is generally numbered 00, and numbers increase with new variants. A higher number does not necessarily mean the part is newer or better, it is assigned somewhat randomly and not all numbers are assigned or used in strict sequence.
17 Part Type. Most similar parts of a certain type have the same type number. In this case, part type 17 (in group 030) is a Piston.

 

[Tomkinsm]

Thanks Richard, that's useful and interesting.