brassbones Posted July 25, 2016 Share Posted July 25, 2016 Every time it cuts in it makes a racket and increases vibration on idle (which is already not great). I'm thinking the bearings or full pump are/is goosed. Anyone else had problems along these lines? Quote Link to comment Share on other sites More sharing options...
brassbones Posted July 26, 2016 Author Share Posted July 26, 2016 Bump Quote Link to comment Share on other sites More sharing options...
Scooter Posted July 26, 2016 Share Posted July 26, 2016 reach down to the pulley there is an inner lip you can grab and it should rotate, it will be reasonably hard to rotate by hand but you should feel some roughness I'd of thought if the bearings are bad. The outer wheel the belt runs on is free spinning (if you removed the belt you could test that too but it's not rough when the aircon is off so it's almost certainly fine) when the aircon kicks in there the inner part is brought in to the main spinning pulley. If the inner pulley feels fine to the hand then the gap between the two pulleys may be worn/enlarged and the noise may be slippage not bearings, does the aircon work well? Quote Link to comment Share on other sites More sharing options...
brassbones Posted July 26, 2016 Author Share Posted July 26, 2016 Yeah, it works fine. The noise also seems to subside a few seconds after the aircon kicks in. Then when its cut out and restarts same routine. Very odd. I wonder if Keron's got one... Quote Link to comment Share on other sites More sharing options...
brassbones Posted July 26, 2016 Author Share Posted July 26, 2016 Will go out and try your by hand test now ... Quote Link to comment Share on other sites More sharing options...
rider Posted July 26, 2016 Share Posted July 26, 2016 Yeah, it works fine. The noise also seems to subside a few seconds after the aircon kicks in. Then when its cut out and restarts same routine. Very odd. I wonder if Keron's got one... Try adding some PAG air con oil into the suction side of the compressor. You can do this with a refrigerant charge as the service cans should be an oil/refrigerant mix. You may just be low on oil on start up as the oil can collect in the evaporator and in a low oil situation there may not be much left in the compressor at start up. Dependant upon the compressor it'll be a PAG 46 or a PAG 68 or a PAG 220 oil. Most are PAG 46. Quote Link to comment Share on other sites More sharing options...
brassbones Posted July 26, 2016 Author Share Posted July 26, 2016 Thanks boys! Scooter - tried the inner wheel by hand and it moves "reasonable" easily and doesn't feel lumpy (added a pic) rider - that sounds like a very good idea. So all I have to do is go for a re-gas and the oil will be topped up? Didn't even know there was an oil in the refrigerant ... just noticed, by battery tray doesn't look too clever Quote Link to comment Share on other sites More sharing options...
rider Posted July 26, 2016 Share Posted July 26, 2016 So all I have to do is go for a re-gas and the oil will be topped up? The refrigerant top ups will contain around 10% oil. The refrigerant cylinders are 100% refrigerant. You usually only need to top up the oil if you have had a major leak. The gas will escape from a system naturally via permeation thorough the hoses. Oil loss will only usually be down to when a hose or union fails. As a rule of thumb though it not a problem overcharging a system with oil unless you seriously overcharge as excess oil will only affect the heat transfer properties of the evaporator reducing efficiency, not the well being of the compressor in normal running. Quote Link to comment Share on other sites More sharing options...
brassbones Posted November 2, 2016 Author Share Posted November 2, 2016 Well, Keron provided a used AC compressor for £80 and I had old unit degassed, unit swapped, 'new' unit regassed for £90. So all sorted for £170. Pretty happy with that in fairness Quote Link to comment Share on other sites More sharing options...
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