My 27' 1978 Hunter came equipped with SR Mariner instruments. The transducers for the knot and depth meters were mounted beneath the v-berth near the fresh water tank.
We bought the boat last year and neither instrument worked at the time. Neither was properly wired (or wired at all). The knot meter's paddle wheel has suffered damage and lost a magnet in its life.
We've thought about replacing this equipment with newer electronics, but here's the catch. The SR transducers used a 2 1/8" hole for mounting their thru-hull fittings. Everything I can find new uses a 2" hole. I haven't removed the old thru-hull yet to verify the exact diameter of the hole in the hull, it could be slightly more than 2 1/8.
I'd like to avoid having to dish out and glass over these holes to start over. Is it safe to install a 2" transducer thru-hull in a slightly larger hole? I've seen a lot of mixed opinion in similar threads here through my searching. I'm also hesitant to simply re-install these 43 year old plastic parts and hope they don't fail.
We bought the boat last year and neither instrument worked at the time. Neither was properly wired (or wired at all). The knot meter's paddle wheel has suffered damage and lost a magnet in its life.
We've thought about replacing this equipment with newer electronics, but here's the catch. The SR transducers used a 2 1/8" hole for mounting their thru-hull fittings. Everything I can find new uses a 2" hole. I haven't removed the old thru-hull yet to verify the exact diameter of the hole in the hull, it could be slightly more than 2 1/8.
I'd like to avoid having to dish out and glass over these holes to start over. Is it safe to install a 2" transducer thru-hull in a slightly larger hole? I've seen a lot of mixed opinion in similar threads here through my searching. I'm also hesitant to simply re-install these 43 year old plastic parts and hope they don't fail.