CHAPTER 3
6. CLOGGED INTAKE:
Floating debris in the water is another culprit. Things like discarded plastic
baggies, weeds, etc. can plug up the raw-water intake. You can avoid this problem by visually inspecting
the strainer basket. When removing debris, be sure to properly replace the seal, otherwise the pump will
lose suction. Smearing the seal with Vaseline or other marine-grade grease helps.
No Water Circulation
…
If upon starting the engine at idle you don’t see water circulating in the strainer: (1)
Stop the engine (2) Check to see that both intake and raw water outgo valves are open at the drives (3) Fill
the strainer basket container with water, re-seal the strainer and turn on the engine again to deal with a
possible air lock, (4) race the engine in neutral momentarily, (4) dive over the side to see if a plastic bag or
other debris is covering the intake, (5) Inspect the impeller which pumps water through the engine.
7. HARD KNOCKS:
Collision with an underwater obstacle that damages the propulsion system. Often
you can still operate the boat at low RPM to return to port, being careful to avoid excessive vibration that
might otherwise compound the damage by damaging the transmission. The problem may be corrected in
a day or so without hauling by an experienced diver who has access to a prop shop where the blades can
be repaired and the prop re-balanced, then re-installed.
8. BAD BATTERY:
Marine starting batteries die from old age and neglect. Keep the terminals and
posts clean from that green corrosion that builds up, restricting the flow of current – preventing them from
fully charging. Periodically have your batteries tested to determine their condition and expected longevity.
The 50z is equipped with a “parallel” switch which can be turned on to employ the 400 ampere-hour
house bank in starting the engine.
9. STALE GASOLINE:
Not applicable
10. SAGGING BELT:
As V-belts wear, they stretch and begin to slip. Consequently, alternators and
water pumps don’t spin to their full speed. Batteries may not fully charge and coolant circulates
sluggishly. The solution is to check belt tension regularly and tighten belts when necessary. Drive belts
can also snap. The only way to avoid this malady is to replace them once they begin to show wear.
Spare belts are provided in the Yanmar spares kit
PROPULSION SYSTEM
Summary of Contents for 50z Downeast
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