David, On the exchanger is a label that says change it "monthly". I think that's a bit much. I change it every 2-3 months. It is usually pretty used up.
It also depends on conditions where you keep your boat. Dennis C. Touché 35-1 #83 Mandeville, LA Sent from my iPhone > On Aug 5, 2017, at 3:50 PM, Dennis C. via CnC-List <firstname.lastname@example.org> > wrote: > > Crap! Easy job went bad but yielded good result. > > Changing the heat exchanger pencil zinc on my Universal 25XPB is usually a > 5-10 minute job every couple months. This time the zinc stuck in the nipple. > Access is difficult with only 3 inches so their is no room to tap with > "special tool alpha (hammer). Decided to pull the end cap and see if I could > grab it and pull it out with pliers. Nope! None of it sticking up. > > While the end cap was off I thought it would be a good idea to look at the > tubes. Mirror on a stick showed a couple pieces of zinc and a couple tubes > scaled up. Double crap! > > Compass Marine has a page documenting pieces of zincs plugging Westerbeke and > Universal exchangers. Worth a look. > > Spent an hour or so with a pick chipping scale. Access is bad with a scupper > hose and bulkhead limiting room. Managed to remove most of the scale and > flush the scale and zinc pieces out. Not totally clean but much better. Last > trip out the engine was running about 10 F hot. The scale may have > contributed. > > So now back to the original problem, the zinc piece stuck in the nipple. > Couldn't get any leverage to push or tap it out. I finally took the zinc cap > (the plug that the zinc screws into) and put a pan head screw in it. Managed > to catch a couple threads, tightened it and used the screw to force the zinc > piece up into the exchanger. Removed it, reinstalled end caps and new zinc. > Engine runs on temp now. > > Beer time! > > Probably need to acid clean the exchanger when the boat gets back to home > slip in a couple months. > > Dennis C. > Touché 35-1 #83 > Mandeville, LA > > > Sent from my iPhone > _______________________________________________ > > This list is supported by the generous donations of our members. If you wish > to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! _______________________________________________ This list is supported by the generous donations of our members. If you wish to make a contribution to offset our costs, please go to: https://www.paypal.me/stumurray All Contributions are greatly appreciated!