What sizes are these AC O rings?
07-08-2012, 03:01 PM
#1
Rennlist Member
Thread Starter
What sizes are these AC O rings?
999 707 247 40
900 174 011 40
999 707 261 40
999 707 247 40
999 707 251 40
Unlike bolts, the sizes are not listed clearly.
These are the rings/seals required to replace the AC dryer and the sensors connceted to it, an the front side of the front AC expansion valve.
What I dont see are the Oring numbers on the back side of the expansion valve..what are those?
Thanks.
May see if I can source those locally here in Seattle.
900 174 011 40
999 707 261 40
999 707 247 40
999 707 251 40
Unlike bolts, the sizes are not listed clearly.
These are the rings/seals required to replace the AC dryer and the sensors connceted to it, an the front side of the front AC expansion valve.
What I dont see are the Oring numbers on the back side of the expansion valve..what are those?
Thanks.
May see if I can source those locally here in Seattle.
07-08-2012, 03:14 PM
#3
Addict
Rennlist Member
Rennlist Member
From Nichols Tip #736 (I don't see the 900.174.011.40 one listed, though):
FWIW, I remember getting a big assortment from a local auto parts place (probably NAPA) a few years ago that was labeled for use in some Nissan model (IIRC; I've lent those out right now and can't check); there was quite a bit of overlap with the above sizes.
Originally Posted by Nichols Tip #736
part number; size(mm); # front; # rear
==============================
999 707 284 40; 6.6 x 1.5; 0; 2
999 707 247 40; 7.5 x 2; 4; 3
999 707 261 40; 9.0 x 1.8; 2; 0
999 707 250 40; 10.6 x 2; 3; 1
999 707 251 40; 14.0 x 2; 3; 4
999 707 252 40; 17.0 x 2; 2; 0
And here's where they're all located:
Front A/C:
Rear A/C:
==============================
999 707 284 40; 6.6 x 1.5; 0; 2
999 707 247 40; 7.5 x 2; 4; 3
999 707 261 40; 9.0 x 1.8; 2; 0
999 707 250 40; 10.6 x 2; 3; 1
999 707 251 40; 14.0 x 2; 3; 4
999 707 252 40; 17.0 x 2; 2; 0
And here's where they're all located:
Front A/C:
- expansion valve (under plastic tray next to intensive washer reservoir): 2 x #251, 1 x #250, 1 x #247.
- return line from expansion valve, middle of firewall: 1 x #252.
- compressor fittings: 1 x #251, 1 x #250.
- other side of return line to compressor at low side fill valve: 1 x #252.
- heading into condenser: 1 x #250.
- bottom of condenser heading up to receiver/drier: 1 x #247.
- pressure and temperature switches just before receiver/drier: 2 x #261.
- at receiver/drier: 2 x #247.
Rear A/C:
- expansion valve: 2 x #251, 1 x #250, 1 x #247.
- solenoid valve under passenger seat: 2 x #284.
- 2 pipes under car from solenoid valve to front connections: 2 x #251. 2 x #247.
07-08-2012, 06:55 PM
#5
Drifting
What pressure should the system be capable of holding?
I just connected the gauges to my 91GT's system and registered 2psi. Filled the system with nitrogen and am reading 240 psi on the high side and 120 on the low side. How long should it hold for? Any leakage allowed? How would I check for leaks?
Am I doing it right?
I just connected the gauges to my 91GT's system and registered 2psi. Filled the system with nitrogen and am reading 240 psi on the high side and 120 on the low side. How long should it hold for? Any leakage allowed? How would I check for leaks?
Am I doing it right?
07-08-2012, 06:57 PM
#6
Rennlist Member
Thread Starter
Whoah there...back up.
It should hold indefinitely or so. If it holds for 30min, yer probly good..and should even out both sides as well.
Your next step pulling a hard vacuum, and checking for leaks that way too.
You can check for leaks with freon with dye in it...works well.
Or..an electronic freon sniffer.
It should hold indefinitely or so. If it holds for 30min, yer probly good..and should even out both sides as well.
Your next step pulling a hard vacuum, and checking for leaks that way too.
You can check for leaks with freon with dye in it...works well.
Or..an electronic freon sniffer.
07-08-2024, 05:02 PM
#7
Rennlist Member
I've added the o rings at the fuel cooler for pre-94.
