Pin hole leak around heat exchanger

[Sam Pratt New Hampshire, USA]

Repaired pin hole leak on top of boiler where heat exchanger exits top of boiler next to safety valve.   

• I used soft solder for the repair, the first two repairs failed due to my poor technique and contamination.   I was successful on third try 
• Other work done at time, Replaced: 3 way solenoid valve (reused solenoid), safety valve, pressurestat, boiler fill tube (located on bottom of boiler).  
• Copper tubing had become hardened and would probably leak when reassemble, to mitigate potential leaks during reassembly, i heat annealed all the flaired ends with a propane torch.
  
• I also soaked everything in citric acid to remove scale (Almost zero due to soften water) and to remove corrosion from a slow leak (reason for pin hole).   
  
• I added teflon tape to all the threaded parts to aid future disassembly.
  
• I experienced zero leaks on reassembly. 
  
• I did add a ground to the pressurestat (it wasn't grounded before).    
  
• This is the third time i have had the machine apart in the 10 years i have owned it.....Total cost of materials $200 approx.   
  
• While my machine was out of service i was using my PID'd Gaggia classic...which needs a major overhaul now!    
  
• First shot after letting the machine drain the boiler once was really good after two months of the Gaggia.
  

Notes:

1.  Solder 95/5, water soluble flux

2.  1/4" Wide teflon tape

3.  "Millard Brand" Citric acid-5 lb bag.

4.  Boiler fill tube (fabricated from  EXPOBAR - BOILER HEAT EXCHANGER INJECTOR - PN: EX1538)

5.  Pressurestat from ebay some time ago

6.  Lucifer 3 way valve off ebay.

7.  This time I purchased most parts from https://www.espressounderground.co.uk, good prices, but it took a long time to receive parts.

[David Hallam]

I wish I could put my C85 back into operation.  We sold our home and bought a retirement villa.  Not enough room in the kitchen.  It now sits in a closet.  I bought a Quick Mill Anderja Premium.

David

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[sam pratt]

I enjoyed bringing it back to life.  I wish i could find a parts machine though.....

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Sam Pratt
856-816-5147

[Alex]

Nice job, thanks for the post!

[sam pratt]

Thank you!

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