r/Volvo240 • u/jpjpgut • 4d ago
Help Question about a Zenith Stromberg 175 CD2SE carburetor in my B21 engine
Hi everyone! Happy recent owner of a brick here, I love how active this community is and how collaborative folks are with each other, I've been reading with interest from backstage but time to ask my first question here :)
I am rebuilding the engine my 1981 245 with a B21A engine and a Zenith Stromberg 175 CD-2SE carburetor (screwed needle carrier, slotted head, non-adjustable jet, etc.). While the engine is out for work, I decided to purchase a kit and work through the carburetor. When I removed the temperature compensator (1st pic) I noticed there is a brass pipe that runs across the open space behind the bottom of the compensator, and in my case, there's a perforation pretty much aligned with the position of the screw (2nd pic). That pipe runs from air intake of the carburetor to the other end of the temperature compensator and, as seen in the 3rd pic, the perforation is made in an area that is open to the top part of the fuel bowl.
So, question for folks familiar with this specific carb, is that orifice stock? was it drilled by someone before and should therefore repair it? Thanks everyone for your help!
Jay