mikec Posted May 12, 2013 Share Posted May 12, 2013 As above really, just stripped a p38 compressor to see about oiling for oba, thing is its all seized so can't turn the pump to see how it works, but inside there's two spirals, is that the pump part? Tried looking on google but can't find anything relevant. Cheers mike Quote Link to comment Share on other sites More sharing options...
mikec Posted May 12, 2013 Author Share Posted May 12, 2013 Think I've sorted it now, from what I can gather there's no other way to lubricate it other than oiling the intakes air. Quote Link to comment Share on other sites More sharing options...
sean f Posted May 12, 2013 Share Posted May 12, 2013 The spiral bit works a ring of piston effectively it is a 6 (?) piston pump working in rotation. It might be possible to drill the top and have a plug in it that you can periodically spray some oil in. In practice with nothing what so every I found they generally last several years, and when they fail stripping them shows that the thin sheet that acts as the valves corrodes due to moisture in the intake air so the pump has to progressively work harder to generate the same air pressure / volume leading to eventual failure. Quote Link to comment Share on other sites More sharing options...
tacr2man Posted May 12, 2013 Share Posted May 12, 2013 They usually have a built in "sump" but on initial system fill you add a measured amount of oil type dependent on refrigerant in use . but otherwise as you say just lubricate thru port , dont over do it tho!! a drip oiler as used for UCL is efficacious HTSH Quote Link to comment Share on other sites More sharing options...
mikec Posted May 12, 2013 Author Share Posted May 12, 2013 The spiral bit works a ring of piston effectively it is a 6 (?) piston pump working in rotation.It might be possible to drill the top and have a plug in it that you can periodically spray some oil in. In practice with nothing what so every I found they generally last several years, and when they fail stripping them shows that the thin sheet that acts as the valves corrodes due to moisture in the intake air so the pump has to progressively work harder to generate the same air pressure / volume leading to eventual failure. I've seen the sanden ones referred to as 6 piston types, but not sure this is the same. It seems that the inner spiral is connected to the pulley offset so the inner spiral just moves forward and back on the outer spiral, if that makes sense, and just squeezes the air. Hopefully that makes sense, ill put some pics up in a minute Quote Link to comment Share on other sites More sharing options...
mikec Posted May 12, 2013 Author Share Posted May 12, 2013 Quote Link to comment Share on other sites More sharing options...
Tanuki Posted May 12, 2013 Share Posted May 12, 2013 The A/C system lubricant should be added to the refrigerant itself: when they refill the A/C they add a measured amount of whatever the specified refrigerant is, plus a measured volume of oil. Quote Link to comment Share on other sites More sharing options...
Simon Smith Posted May 12, 2013 Share Posted May 12, 2013 Yes, that's a scroll compressor, and it works just as you suggest. Quite common in commercial refrigeration, but I didn't know they were used in car AC systems. I would say it's better than a piston compressor for use without oil, less to sieze up and no reed valves to rust away. What is it off? Ok just read the first post properly, P38. Wonder what else has them. Quote Link to comment Share on other sites More sharing options...
mikec Posted May 12, 2013 Author Share Posted May 12, 2013 I knew the refrigerant lubed the pump but didn't know it was added to it. So least I know what it's called now, ill have to google now and see if anyone's used one for oba. It looks similar it the 3.9 disco engine pump too. Quote Link to comment Share on other sites More sharing options...
tacr2man Posted May 12, 2013 Share Posted May 12, 2013 this should give you more of an insight http://www.google.co.uk/imgres?imgurl=http://www.jaguar-swansea.co.uk/aircon/images/014_compressorSandenScroll015.jpg&imgrefurl=http://www.jaguar-swansea.co.uk/aircon/systems.htm&h=355&w=401&sz=59&tbnid=eWMpCnBsPqkfrM:&tbnh=90&tbnw=102&prev=/search%3Fq%3Dscroll%2Btype%2Bcompressor%26tbm%3Disch%26tbo%3Du&zoom=1&q=scroll+type+compressor&usg=__6utILhPiMZ4c5nqGtPY0fWecTpY=&docid=VVMNKy1LbQEZMM&hl=en&sa=X&ei=rwiQUcSpMcOtPNGCgOAE&ved=0CEcQ9QEwAg&dur=2086 Quote Link to comment Share on other sites More sharing options...
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