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 <cnc-list@cnc-list.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 <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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> 
> Aries
> 1990 C&C 34+
> New London, CT
> 
> 
> 
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