David, A bit more. The engine manual says change exchanger zinc at 50, 100, 250, and every 250 hours after.
Dennis C. Sent from my iPhone > On Aug 6, 2017, at 7:58 AM, David Knecht via CnC-List <email@example.com> > wrote: > > Hi Dennis- I changed the zinc when I pulled the heat exchanger several years > ago. You wrote “every couple months”. Really? How often does that pencil > zinc need to be changed? Dave > >> On Aug 5, 2017, at 4:50 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! > > Aries > 1990 C&C 34+ > New London, CT > > > > _______________________________________________ > > 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!