Hi all
I picked up an old (early 2000s) Bezzera BZ99 from a fellow CSer who had done some work on it to ensure everything was in good order. It pulls great shots but it's been producing a fairly loud screeching noise once pressure builds up. I pulled the machine apart and I've isolated the noise to the OPV, which explains why the screech only starts at full pressure.
I pulled the OPV out, took it apart and descaled every part (except the rubber gasket... lol) with a strong citric acid solution. Put it all back together and the screech was gone temporarily, but within a day it was back.
Soooo... I can get a new OPV from the Australian Bezzera distributor for about $60 but I'm just wondering whether there's a real performance or machine wear & tear issue that I need to resolve or whether I can just ignore the noise and keep going about my latte-making? The noise doesn't really bother me that much, but if I'm putting the machine at risk I'll drop the $60 on a new part.
I picked up an old (early 2000s) Bezzera BZ99 from a fellow CSer who had done some work on it to ensure everything was in good order. It pulls great shots but it's been producing a fairly loud screeching noise once pressure builds up. I pulled the machine apart and I've isolated the noise to the OPV, which explains why the screech only starts at full pressure.
I pulled the OPV out, took it apart and descaled every part (except the rubber gasket... lol) with a strong citric acid solution. Put it all back together and the screech was gone temporarily, but within a day it was back.
Soooo... I can get a new OPV from the Australian Bezzera distributor for about $60 but I'm just wondering whether there's a real performance or machine wear & tear issue that I need to resolve or whether I can just ignore the noise and keep going about my latte-making? The noise doesn't really bother me that much, but if I'm putting the machine at risk I'll drop the $60 on a new part.



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