Tayana VANCOUVER 42, Operation And Maintenance Manual

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It might be well to note here that there may be zincs in the cooling system of your engine.
(Many Yanmar’s do not, but the Yanmar 3MQ30 does.) Also some refrigeration systems also
have zincs in their cooling systems. These also must be checked and replaced as they are
sacrificed. Refer to the engine manual for their location.
G. Plumbing and Sanitation Systems
Plumbing and sanitation systems are generally very reliable and require relatively little
maintenance. A program of inspections will usually prevent most problems from developing. The
critical points in the systems are the pumps; everything else is pretty simple and reliable.
1. The Fresh Water System
The heart of the pressure water-system on the Tayana 42 is the PAR medium duty diaphragm
pump. This pump is generally located in a compartment along with the electric bilge pump and
the shower sump pump (an option). It can be recognized by the pressure switch located on side.
You will find a manufacturer’s parts list and a description of the pump among the papers
delivered to you with the yacht.
These pumps are highly reliable and will operate several years without any real maintenance
requirement. If an occasion arises where a pump fails to operate, one should first check the
pressure switch. This simple switch can accumulate dirt and not turn the pump on. If this should
happen, turn off the power to the pressure water system, remove the pressure switch from the
pump, and remove the switch housing. If the switch is dirty, carefully clean out the accumulation,
reassemble the switch and try the system. If this does not solve the problem, you probably have a
defective switch and it should be replaced. Two other common faults can cause the pump to
malfunction – a broken belt, which is immediately obvious, or defective diaphragms. To check the
diaphragms, remove the four screws in the top of the pump housing and carefully lift the top off.
You will see two diaphragms; examine each. If they are defective, it will be obvious; they will
have holes or they will be out of the diaphragm frame. Defective diaphragms should be replaced.
PAR does produce rebuild kits for these pumps. While it is not a bad idea to have a rebuild kit, the
most common requirement will be for a pressure switch, diaphragms, and belts. Before going on a
long cruise, take a spare pump! Maintenance of the fresh water system requires little more than
tightening the hose clamps to prevent leaks. If your pressure pump comes on at intervals when
there is no demand, there is almost certainly a leak that is allowing the pressure within the system
to drop. Inspection will almost invariably show that there is a loose connection and air is getting
into the lines. Again, tightening the clamps will normally solve the problem. Have some extra
clamps and hose before going on a long cruise.
Your hot water system is based on a ten gallon hot water heater, usually made by American
Appliance, Inc. It has both an electrical heating element and a heat exchanger which gets hot
water from the engine. It requires very little maintenance beyond keeping it clean and all
connections tight. The hot water heater will last at least five years. The most likely failure is the
electrical heating element. If this should happen, a new element may be obtained from almost any
camping supply store and it is a simple matter to install.