FNM HPE Series Owner's Manual page 83

3.3.7 Anodes consumption check and replacement
Ordinary maintenance: made by the boat user and the workshop staff.
Zinc anodes prevent oxidation of engine metal parts. They are positioned in different parts of the sea
water circuit. Replace the anodes if the sacrificial zinc cartridge (see the picture below) is consumed
over the 50% (the length of the new part is around 15 mm). The zincs consumption depends on many
ambient factors and engine connections. FNM
environment.
Follow the instruction to disassemble:
1. Stop the engine
2. Unscrew the anodes only after closing the sea water circuit valve.
3. Replace the anodes if the consumption of the sacrificial part is greater than 50% (less than 8
mm). Together with the anodes replace also the copper washer. In the re-tightening always
use thread sealant type LOXEAL 1810.
®
FNM HPE Series
®
uses pure zinc anodes that can be used in the marine
Figure 33 - Zinc anode
79