A/C Compressor 'O'Rings

[Simon_P]

Hi All,

I need to do some work on the A/C. I know that I will need the 2 'O' Rings that seal the compressor inlet and outlet connectors (R12 compressor).

But I don't know what size they are.

Can anyone help with dimensions?

Thanks

[wayne]

Hi All,

I need to do some work on the A/C. I know that I will need the 2 'O' Rings that seal the compressor inlet and outlet connectors (R12 compressor).

But I don't know what size they are.

Can anyone help with dimensions?

Thanks

Simon

Cant help with the o ring size at the moment. Hopefully someone will get back to you soon.

I ordered a full seal kit for the compressor last year. I dont remember if it was from thw Lotus V6 parts manual or from another company. (I seem to remember it was very cheap). If no one gives you an answer within a couple of days I will check the kit when I get home. And see where I bought it from.

[Simon_P]

Thanks Wayne,

I bought the Compressor 'O'Ring kit A100P6034S from Lotus a few years ago - from memory only about £20 but it had the Black rubber R12 'O'rings rather than the green HNBR which I would prefer to put in after the conversion to R134a.

I only need the 2 small 'O'rings and would like to get some spares - It looks like I can get a whole box of HNBR 'O'rings of various sizes for £10 - Just need to make sure it has the correct size.

[Simon_P]

I had the compressor off today.

It is a Diesel Kiki DKS-13G - The new one that I have stashed away is a Zexel DKS-13G bought from the aftersales list. They are identical. This is for the R12 system.

The two 'O' Rings for the suction and delivery pipes are 26x22x2 and 22x18x2

The actuall dimensions are all +0.3 MM but I'm guessing that is because they are squashed so have rounded them down to available sizes. They sit in a wide groove so a near Inch equivalent would also do.

[Fourdoorcat]

Simon....did you chronicle your adventure regarding the switch from R12 to R134a someplace on this forum? Those of us who will, some day, need to do so are very interested.

Thanks,

Ken

[Simon_P]

Hi Ken,

I have an S2, and have retro fitted the system from an SE so I have had it all in pieces - There aren't any A/C jobs that are technically difficult, but there are some that are real buggers.

You have two great advantages being in the US. Most shops and parts stores have a. the tools and parts, and b. the experience. Anything to do with air conditioning over here is regarded as a specialist job.

You will need all of the tools for a complete A/C recharge. 134a can get through some types of rubber so you need to use refill hoses compatible with 134a. I bought my kit from Harbor Freight - it does the job!
'O'rings - made from HNBR as the existing black R12 ones will leak over time - the more you change the better - common sizes except the 2 mentioned above.
134a gas
PAG oil - When you buy it ask what the correct viscosity should be - I'd like to know!
Recharge port adapters and a sticker to say that the conversion has been done. I think that this is a legal requirement also.
A new receiver drier.

R134a does not transport the old R12 oil very well, hence the change to PAG oil. So ideally you want to drain all of the old oil. The compressor has a drain and you are changing the receiver drier, which theoretically leaves 1 oz each in the evaporator and condenser. There are 2 schools of thought here 1. that you need to have it all flushed out 2. That the only issue is transporting the oil around the system so get what you can out. My system was in pieces so I was able to pour it out, but I didn't do any cleaning or flushing. Recent articles I have read seem to suggest there aren't any big issues, but flushing can cause some.... Your choice!

Change all of the 'O'rings you can get at - some you can't - never mind!

Change the receiver drier for an R134a compatible one - you need a new one anyway - It is a standard size - You don't need one with a window (bubbles don't mean the same with 134a)

Test for leaks then do a refill according to the manual - oil quantities are the same but use PAG oil - Gas quantity should be 10% less for R134a. Don't invert the gas bottle you will hydraulic the compressor.

Observe all of the regulation regarding the Environment and Health and safety and particularly apply common sense!

It really isn't difficult if you make sure you have the right tools for the job.