P38A O ring size for Diesel Aircon

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EntropyUK

Well-Known Member
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467
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Hemel Hempsted
I am looking at replacing the O rings that sit between the Air Con compressor and the hi and low pressure pipes. I have checked LRCAT and it just lists the parts as sizes and does not show which of these parts is connects the compressor and pipes together. Is anyone able to advise of the size of the rings of step 33 in the diagram below?
upload_2019-7-10_16-41-44.png
 
I've struggled to get the right part numbers too. What I ended up doing was going to a main dealer, getting them to give me the part numbers of all the possible variants, and order the lot. Then when it comes to spanner time you will certainly have one that is right. The cost of them is minimal. Same with all the other O rings in the system.
Good luck
 
Last edited:
killerhaggis said:
Could these be the ones you are after? on is discharge side the other on the suction

https://www.brit-car.co.uk/shopimages/products/normal/S/STC/STC3177.jpg
STC3177 - O RING AIR CON PUMP DISCHARGE - RANGE ROVER - DEFENDER - DISCOVERY 2
Supplier: Land Rover | Type: Genuine | Product: STC3177

https://www.brit-car.co.uk/shopimages/products/normal/S/STC/STC3176.jpg
STC3176 - O RING AIR CON PUMP SUCTION P38 RANGE ROVER
Supplier: Land Rover | Type: Genuine | Product: STC3176
Click to expand...

Hi

Looks like we posted virtually the same time , lol
 
Datatek said:
If they are not leaking, why change them? They are not as far as i know a common failure point.
Click to expand...

I am getting the car ready for it MOT as it has expired. I tried to get the system regassed last summer but there was a substantial leak in the system and the hiss was coming from the compressor area. I thought that the leak would more likely be the O rings rather than the compressor so was going to replace and then see if system was airtight when going for the MOT.
 
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