Tube Stack And 'Wasting Zinc Anode - Beta Marine Beta 28 Operator's Maintenance Manual

HEAT EXCHANGER TUBE STACK AND 'WASTING ZINC ANODE'
1. The wasting zinc anode should be checked regularly
at least every six months and replaced every year or
sooner, as necessary. The anode is attached to the
bolt inserted in the end cap of the heat exchanger.
See photo 46. On most engines this is on the aft end.
2. Unscrew the bolt and replace the complete unit with
a new one.
3. It is possible for fine sea weed and other debris to get
past the inlet filter and into the tube stack. This
should be removed and cleaned. See photo 47.
4. Drain off coolant into a bucket.
5. Unscrew the 6 end cap retaining bolts using a 5 mm
Hex key (3 each end of the heat exchanger). Remove
the 'O' rings and slide out tube stack. Carefully clean
tube stack and end caps.
6. Re-assemble using new 'O' rings 212-07273. The
tube stack can be fitted either way around but must
be aligned correctly with the horizontal line and
rubber seal between the alignment marks at the
exhaust end of the heat exchanger. (This ensures
correct coolant flow in the heat exchanger) Do not
over tighten end cap bolts.
7. Re-fill engine with coolant (water / anti-freeze
solution) and run engine up to temperature to check
for leaks.
46
Zinc anode
47
48
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