The heat exchangers are made of a copper-nickel alloy which is also commonly used for all types of saltwater interfaces in the power generation and military industries. No anodes are required. Anodes are required in a raw water cooled engine because there is no way to prevent the saltwater from touching the cast iron engine blocks. Similarly in the military and industrial heat exchangers the shells are made of carbon steel and as a result anodes are attached at those locations.
As for our freshwater cooled engines the cast iron is protected by the cocktail of chemical additives in the glycol coolant. The coolant also has lubricants to help protect the waterpump shaft seals. In the freshwater versions of our engines the block is exactly the same as the raw water counterparts. The anode ports are simply plugged with a screw in pipe plug. This provides an opportunity to install a block heater to keep condensation from accumulating during the off season. I had stuck rings one year and I've kept a block heater ever since with no recurrence of the stuck rings. Zerostart 310-0003 Engine Block Heater https://www.amazon.com/dp/B002UNASYS/ref=cm_sw_r_cp_apa_iOPuzb6CAMJER Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Jun 27, 2017 8:52 AM, "Bruce Whitmore via CnC-List" < [email protected]> wrote: > Hello all, > > I think I know the answer to this question, but I just want to confirm. > On a Yanmar 3JH2E, are there any sacrificial anodes in the heat exchanger > or anywhere else to replace? > > I've checked the repair manual for the engine, but found nothing. > > Just wanting to be sure... > > Bruce Whitmore > 1994 C&C 37/40+, "Astralis" > Madiera Beach, FL > (847) 404-5092 (mobile) > [email protected] > > _______________________________________________ > > 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!
