View Single Post
  #15  
Old 12-02-2017, 11:24 AM
jimmypete jimmypete is offline
Registered User
 
Join Date: Jun 2010
Location: New Zealand
Posts: 108
Quote:
Originally Posted by BillGrissom View Post
My point is that later OM617 engines have a cylindrical pre-chamber with no place for carbon to build-up. There is no throat as in the drawing linked in post 11. The pre-chamber is 1-piece and has straight walls. If you want to clean-up the threads in the glow-plug hole, a standard metric tap will work. But, I didn't find any carbon on the threads, so seems a waste of time. People don't normally chase spark plug threads in gas engines, which is about the same issue. Anyway, would be great for someone to search and grab the photos of different pre-chambers and add to the DIY for posterity.
My drill bit had quite a lot of room inside the GP hole. It didn't feel like it was a narrow throat like in that drawing.
Reply With Quote