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HNBR or NOT??

Skip R on Sun August 19, 2012 10:08 PM User is offline

Year: 81
Make: VW
Model: Rabbit PU
Engine Size: 1.6L
Refrigerant Type: 134a

I have a Sanden SD508 9288 AC compressor that is NEW and so one might call it New old stock but new. From what I can tell it was made in January 1987 in Singapore and I assume the 7 in the serial number means 1987. My question is; is there and chance that this compressor has the HNBR seals, o-rings or anything take would make it compatible for the 134a freon because that is what it going to have in it plus the PAG 100 oil. I did see on another forum that the guy said the new Sanden pumps made in Singapore had the new type seals etc in them but I don't know just what he meant by new. And if this does not have the updated seals etc what do I need and where is a good place to buy it? thanks for taking a look Skip R

AutoCool on Mon August 20, 2012 11:37 AM User is offline

DO a search here for "Sanden 508 R&R" and you'll see the shaft seal and procedure on that compressor. I believe that body seals and such are neoprene and should be fine with R-134a. Make sure you drain the oil thoroughly.

ice-n-tropics on Mon August 20, 2012 5:49 PM User is offline

Sanden never used Neoprene (as was common in GM/HRD).
I remember that it was after 1987 when Singapore switched from NBR to HNBR
I've had good success retrofitting NBR equipped compressors w/ POE lube
SD508 HNBR swash plate comp is more durable w/ PAG SP20 (not PAG 100) w/ R-134a
hotrodac


-------------------------
Isentropic Efficiency=Ratio of Theoretical Compression Energy/Actual Energy.
AMAZON.com: How To Air Condition Your Hot Rod

Edited: Mon August 20, 2012 at 5:58 PM by ice-n-tropics

AutoCool on Tue August 21, 2012 5:05 AM User is offline

Aftermarket orings for that compressor are going to be compatible, they're listed on ackits.com



Edited: Tue August 21, 2012 at 5:15 AM by AutoCool

Skip R on Thu August 23, 2012 9:05 AM User is offline

Quote
Originally posted by: ice-n-tropics
Sanden never used Neoprene (as was common in GM/HRD).

I remember that it was after 1987 when Singapore switched from NBR to HNBR

I've had good success retrofitting NBR equipped compressors w/ POE lube

SD508 HNBR swash plate comp is more durable w/ PAG SP20 (not PAG 100) w/ R-134a

hotrodac

So, you are saying that my Sanden SD508 compressor which was made in Singapore in 1987 (I assume) after I have replaced the shaft seal with a new seal kit should be filled with 6oz of PAG 20 and not PAG 100. The PAG 20 of course being thinner should not be a problem is that correct? And on the subject of replacing the shaft seal with a new update kit when I got into it there was no sign of a large o-ring seal in the housing area, it wasn't even there, just a little surprised to see that. And I assume the Large o-ring between the piston body and shaft plate will be OK to reuse and if not where could I get a new one.

AutoCool on Thu August 23, 2012 11:00 AM User is offline

SP20 is Sandens "part number", it's Sanden brand oil and it's a PAG 100 oil. I think he meant to use POE (Ester oil) instead of SP20/PAG100. Slip of the keyboard.

ice-n-tropics on Thu August 23, 2012 3:42 PM User is offline

Sanden used SP20 (SEC PAG from DOW) in Singapore comps at least till 2010 and USA comps till 2003 or 4. Viscosity is a lot thicker than PAG 100
SEC PAG is not the best for retrofit if there is any residual R-12 absorbed in the residual mineral oil due to copper plating and sludge. I have used POE (Union Carbide) in 20 Sanden retrofits in cars and HD trucks where there is residual mineral oil without CU plate or sludge plus the sight glass does not turn milky as with PAG at high ambient.
Sanden SP10 is DEC PAG and OK for retrofit and same viscosity as PAG 100.
hotrodac

-------------------------
Isentropic Efficiency=Ratio of Theoretical Compression Energy/Actual Energy.
AMAZON.com: How To Air Condition Your Hot Rod

Edited: Thu August 23, 2012 at 4:08 PM by ice-n-tropics

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