Hello,
I need to replace the B&G Network Speed Transducer. I have two (2) choices - go with an exact replacement of the existing B&G Network Speed Transducer, or replace with an AIRMAR Speed Transducer.
The B&G unit would fit right into existing thru hull. The AIRMAR would require replacing the existing thru hull with a larger one.
I'm inclined to replace the thru hull with a new bronze thru hull because I don't know what material the existing B&G thru hull is made from, plus it was installed in 1996.
Some questions:
1) What model AIRMAR Transducer have others used, and what is the wiring interconnect for its transducer cable to the existing B&G Network Speed Transducer cable which will have to be accomplished with either a cable connector or terminal strip? Also a source from which to procure?
2) Any ideas as to how to remove existing B&G thru hull which is either made from plastic, nylon or Marelon? (Which is it made from?) Seems I have two choices: push it out from inside, or use a pipe wrench and twist it out from inside. How do I break the sealant loose that surrounds it? Heat and push? Heat and twist. Scrap around on the outside first?
3) Installation of a new larger bronze thru hull? Use a double hole saw mandrel with first hole saw to fit into the existing hole as a guide for second larger size hole saw? Or, use a wooden bung placed tightly in existing hole, sawed off flush with hull and then use a regular hole saw placing its drill in the center of the wooden bung and drilling into that until hole saw positions itself onto fiberglass? Second option would be cheaper than buying two position hole saw mandrel from Starret. Should this new bronze thru hull be bonded to rest of bonding system?. How does one attached a bonding wire to this type thru hull which will just have a backing nut on the inside as opposed to studs on which you could place a terminal on one of the mounting bolts? Do they made a thin bronze large hole terminal that could be place over thru hull before put backing nut on? Also, what type of bedding material is recommended?
I know I have asked a lot of questions. I apologize for that.
Thank you,
Larry Rossi
s/v Galileo IP 37-44
