Delco A-6 shaft seals.

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Delco A-6 shaft seals.

Postby cornbinder89 » Sun Feb 26, 2017 5:43 pm

I am going to replace a leaking shaft seal on my A-6 in a commercial truck. Unlike the seals I have done in the past on an A-6 the seal supplied is a rubber lip type seal not a face seal of ceramic or steel. Its been 30 years since I did one, but my concerns are this:
With the face seal, the sealing surface was replaced with the seal, where-as a lip seal rides on the shaft and can wear the shaft. I can see where a lip seal may initially provide a better (more positive) seal but my concerns are "down the road"
I notice that some mfg (MEI) still offer the ceramic or steel face seal
Where this compressor is used in a semi and run many hrs a year, far more than most cars will see in 8-9 years, do I risk the shaft on a lip type seal, and would I be better off with the old face seal? I know that the face seal will tend to leak a bit more than a lip seal, but it will not wear the shaft as it has no part that rides (wears) directly on the shaft.
Given that the A-6 is a dinosaur, and out of production, and I expect to be trucking for another 10 years or so, would I be better off with the face seal tech?
What say those that replace seals for a living? I have no inclination to replace the whole compressor with a re-man for a seal leak, and with the quality of some re-mans, when I get a good one I want to keep it.
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Re: Delco A-6 shaft seals.

Postby cornbinder89 » Sun Feb 26, 2017 6:12 pm

Also, if I am going to use a face seal, do you have a recommendation on steel vs. ceramic as both seam available?
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Re: Delco A-6 shaft seals.

Postby Tom Greenleaf » Mon Feb 27, 2017 11:50 am

I'm not going to know which is better or advised for certain conditions it would be exposed to. Nacho would know off the top of his head. Because this joint is so slow I doubt he's by often or much at all but could contact him off site if you wish he has responded,

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Re: Delco A-6 shaft seals.

Postby cornbinder89 » Tue Feb 28, 2017 3:34 pm

E mailed "Nacho" and his recommendation was the original face seal in steel. He too has heard of people using the lip seal from later compressors, but said in never worked for him.
I'm posting this in case it helps others, and again, thank you Ignacio for your wisdom.
He also recomended running it for a while after install to seat the two parts of the seal together. His comment was if you just re-seal and charge the system, but don't run it, it will slowly leak, running beds the two parts of the seal together.
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Re: Delco A-6 shaft seals.

Postby Tom Greenleaf » Tue Feb 28, 2017 5:37 pm

I knew he would know that easily. I gave up but like you would probably have to for an A-6 but none in the stable so low chances of needing to.

Good luck. Said somewhere I gave it up with the first one, another type I spend all day being so clean and careful to have it leak worse than before I started!

I don't think they make an easier one than that either so pretty disappointed,

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Re: Delco A-6 shaft seals.

Postby cornbinder89 » Sun Mar 05, 2017 2:06 am

Got around to doing the seal, so far so good, but time will tell. I forgot how hard it is working "down in the hole" to see that the snap-ring is seated, once you get the seal, snap ring and snap ring pliers in the hole, there isn't much room to see that it is in the groove.
The unit was low on oil, not empty but below the test/drain plug, so topped it up and lube the seal before installing. Held vacuum and charged it. Of course there was an electrical gremlin to track down to get the compressor to turn on. Hit a deer over the winter and it was right where all the electrical cables come down from the cab to the chassis.
Couldn't see and reason it was leaking, but there was plenty of oil on the clutch, so it was leaking there. The seal look good but there are 2 o rings that also need to seal, one seals the ceramic or steel portion to the case and the other seals the rotating carbon portion of the seal to the shaft. Either of these could have leaked as well as the seal.
It was 70 deg here today, and last (A week ago) Friday I needed chains on my drive axle to come home! crazy!
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Re: Delco A-6 shaft seals.

Postby Tom Greenleaf » Sun Mar 05, 2017 2:59 am

Sure sounds like a total success - great. Same here with weather - 75F recently and maybe a dip to zero tonite! Soon it will be use heat and A/C in the same day like a nut!

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