I replaced the original seal marked "usa 9 HRD" with the 21-34734 large shaft seal and it leaks like a sieve
Now that I have the original single lip seal out, I measured the area at the outer edge of the seal - it came out to 14.25mm. Does this mean that I should have used the small shaft seal? Looking at the double lip large shaft seal, the outer lip is smaller and the inner is larger - possibly 18mm. The shaft also has a larger diameter further back.
Also, I had some difficulty installing the new seal - it was impossible to push it in and I had to put a socket over it and hammer it in. It felt like it was a bit too large to fit.
Any suggestions on how to get this right?
I've done a bunch- never had your experience- obviously you have the wrong seal- if you have to hammer it in-- they always just seat with a smal rotating force- then you hear and feel it seat.
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......
Can't remember off the top of my head which seal kit it was. But when I was figuring out the two sizes I noticed that one kit contained two o-rings. One was thicker than the one for the A6 I was working on. Using the thicker one made the seal almost impossible to slide into place. I measure the compressor shaft to determine the correct seal. This is also the method the compressor re-builders suggested when went through this seal issue months back.
Okay, so seal should I use? The shaft before the shoulder is about 14.25mm and after that I haven't measured but it is considerably larger. So which measurement do I use???
On the other hand, maybe I just happened to get the thick o ring in the kit and I need a thin one (there is only one in the kit for a large shaft). It may be possible to drive the seal out from behind and replace the o-ring. Can the needle bearing be removed without damage to expose the back of the seal?
As far as the o-ring goes, the one kit had both in it. That is the only reason I mentioned comparing it to the one you take out of the compressor. Measure the non-threaded part of the shaft for the correct seal.
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