Free 186 More Best Homemade Tools eBook:  
Get tool plans

User Tag List

Page 2 of 2 FirstFirst 1 2
Results 11 to 12 of 12

Thread: Patching a broken valve - GIF

  1. #11
    mlochala's Avatar
    Join Date
    Nov 2012
    Posts
    503
    Thanks
    70
    Thanked 146 Times in 104 Posts

    mlochala's Tools
    Quote Originally Posted by Frank S View Post
    Yes it does look like JB weld but many 2 part epoxies look the same. One thing I noticed was his lack of proper surface preparation. You never want to rely on the bond between paint and metal or epoxy on paint to achieve ultimate bond strength,
    Not to mention the next time they try to open or close that valve and then discover some of the epoxy seeped through. That won't be much fun.

    186 More Best Homemade Tools eBook

  2. #12
    Supporting Member NeiljohnUK's Avatar
    Join Date
    Dec 2017
    Posts
    687
    Thanks
    61
    Thanked 249 Times in 176 Posts

    NeiljohnUK's Tools
    I started using Belzona in 1978 in the power industry for repairing stuff, biggest job that established them in the UK was the Hinkley Point 'B' power stations sea water cooling butterfly valves, originally designed as shutoff valves they had been used operationally as variable modulating throttle valves and suffered significant erosion of the butterfly and the body as a result. Machining off ~ 1 to 2" of surface, rebuilding with Belzona and re-machining to original spec enabled them to last much longer without significant erosive damage/wear. I still use Belzona at work, repairing Process Cooling Water system parts on high vacuum sputtering machines, again machining away the eroded/corroded metal, rebuilding with Belzona and refinishing when spare parts have a 6-9 months lead time and will suffer similar problems inside 2 years, the repaired parts are still good and in use 4 years later.

    JBWeld isn't quite Belzona, but still useful, my F658GS suffered the usual BMW F800 leaking oil/water heat exchanger problem due to corrosion creeping under the seals, machined off the worst, grit blasted the rest to remove deeper corrosion and form a key then rebuilt with JB, machined it flat then top flat skimmed with JB simply to fill any exposed opened bubbles from mixing first batch, polished on crocus paper to finish, a lot cheaper than a new one at £130 and with that epoxy surface never likely to corrode again.

    2,000+ Tool Plans

  3. The Following 2 Users Say Thank You to NeiljohnUK For This Useful Post:

    bob_3000 (Aug 30, 2024), Toolmaker51 (Feb 7, 2022)

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •