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 <cnc-list@cnc-list.com> 
> 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
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