Originally Posted by rwidman
The difficulty is predicting in advance which part is going to fail. In addition to the engine spares, I put a spare macerator and head
pump kit on my boat for a two and a half month cruise. The windlass
I was able to order a replacement and have it shipped to a marina I was planning on stopping at anyway but how could I have predicted this failure?
Naturally. That's why you have to guess as to which is more likely to fail and/or has more severe consequences, and then balance that list against what you're willing to spend, and how much space you have, and there you have it.
Here's one idea:
All belts, hoses, filters, and gaskets.
A spare injector or two (I have a whole set).
A set of injector lines (very common failure)
hose and clamps.
Starter or at least rebuild kit
Complete spare alternator
Fresh water pump
Spare exhaust elbow
and exhaust hose
Plenty of impellers (don't see the need for complete spare seawater pump).
Spare heat exchanger
would be an expensive luxury -- I don't have one, but I don't think it's a bad idea.
Lift pump if your engine has one (mine is a roller cell pump integrated with the injection pump)
A rebuild kit for the injection pump is a good idea.
For the genset:
Similar to above.
For the rest of the boat:
Complete fresh water pump or at least rebuild kit
Complete gray water pump or at least rebuild kit
Complete spare bilge pump
(or pumps if there are different types)
Rebuild kit for manual bilge pump
Spares for gas system -- solenoid valve, collection of spare fittings, hose,
clamps. Spare regulator
Windlass -- spare motor
-- highly recommended although expensive. BTDT. Spare handset.
Winches -- maintenance
, grease, etc.
Spare blocks, shackles, pins, of all kinds. Spares for genoa
cars and/or traveller (balls, end caps, sheaves).
Nav lights -- spare bulbs. Spare compass
Spare pipe, fittings, hoses, washers for faucets and shower
taps. Large collection of hose clamps/jubilee clips. Plumbing
tool kit. Garden hose and large collection of fittings and adapters.
Complete spare toilet pump (important!) and rebuild kit for toilet. Spare sanitary hose and clamps. I learned the hard way, after having lost
many cruising days to horrible toilet problems, to carry a plethora of spares for the toilets -- at least one of everything which could possibly fail, and actually multiple spares in most cases. I have two complete spare electric
pumps on board plus all the rebuild kits AND a complete manual pump which can be substituted for one of the electric
: Spare heading sensor and network GPS
receiver. Spare N2K backbone cable, patch cords, tools and terminators. Spare depth
transducer (best if installed in place). Spare wind
transducer installed and in place (I have this).
: Lots of assorted wire of all types on board (including AC cabling), crimp terminals, crimp tool, solder kit, spare LED lighting
units or light bulbs. Backup inverter
(I have this). Backup battery charger
(I have this and it's important to have -- battery
chargers fail pretty often and it's a real PITA). Spare circuit breakers and fuses
. Spare sockets, switches, other electrical
items. Spare battery cable and terminals. Jumper cables
. Spare toggle switches (amazing how many of these I've needed over the years). Extensive electrical tool kit including multitester.
: Cans of refrigerant and hose/gauge kit. I wish I had had that last summer!
: Some serious ocean cruisers carry a complete spare autopilot, sometimes even installed and in place. In any case, a spare pump is a very good idea. Spare steering cables and fixing brackets. Obviously, emergency
tiller. Spare rudder
seal and/or bearing (if applicable).
: Spare anodes, cutless bearing, spares for prop (if applicable), complete spare propeller
Spare shore power
cable. Collection of adapters.
to back up main generator (believe it or not, I have this, although I might be selling it).
Tools: Very complete tools including power tools.
Fasteners and materials: All possible stainless nuts, bolts, allen bolts, washers, screws, other fasteners. All kinds of materials for makeshift repairs
. Glue and sealers of various types.
Your spares and tool inventories naturally grow with the years -- as things break and you replace them, you get a feel for what is needed. Sometimes you replace something just because it's old, and you keep the old one for a spare. Sometimes something breaks and really ruins your day, and you learn to keep a spare of that on board. Very often broken things are kept for parts or salvage
material -- a collection of broken things is also a great thing to have on board.