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Machinery damage: why the engine is a question of its own
Short answer
Hull wordings are built around events that come from outside. An engine that fails from the inside is a different question, and the answer sits in a clause most owners read once the gearbox is already open.
Hull wordings are built around events: grounding, collision, fire, theft, weather. An engine that simply stops, a gearbox that loses a bearing, a shaft that runs out of true, none of that comes from outside. It is internal breakdown, and a hull clause is not written for it. That is why machinery damage is usually offered as an agreement of its own rather than as part of the standard wording, and why it is worth asking about while the boat is still inside the dealer's warranty and the engine file is complete.
Four things decide whether such an agreement is any use on a particular boat. The age of the engine, because many wordings stop at a stated number of years or running hours. The evidence of servicing, because the line between breakdown and neglect is drawn on the service record. The parts named, since drive, gearbox, shaft, propeller, generator and the cooling and water installations are not always listed together. And the treatment of the part that failed against the damage it caused, which is the same distinction that runs through every technical claim. Ask for those four in writing. Our machinery cover, available from Basis Plus, ends once the machinery is more than ten years old and requires servicing by a specialist firm to the maker's schedule.
It matters most where a failure is expensive to reach. A motor yacht with two engines, a boat working hard in charter, a cruising yacht a long way from the nearest yard: in all three the invoice is dominated by lift out, transport and waiting time rather than by the part itself. On a small outboard the calculation usually runs the other way. Before the season, note the hours, file the service invoices where you can find them again, and photograph the engine plate. All three are asked for at the worst possible moment.
Outboard engine servicing: what the annual service covers
An outboard engine service follows the maker's schedule, set in running hours or as a yearly interval, whichever comes sooner. The usual items are the water pump impeller, gearbox oil, spark plugs, fuel filter, anodes, the propeller shaft and its seals, and on four stroke engines the engine oil and oil filter. The gearbox oil is worth looking at closely: milky oil means water has got past a seal, and caught early that is a small repair rather than a new lower unit.
Between services, flushing with fresh water after use in salt water, checking that the tell tale stream is strong, and keeping the fuel fresh do most of the work. Note every service in a log with the date, the hours and what was replaced, and keep the invoices. A neat record helps when the engine is sold and when anyone asks later whether a failure was sudden or the result of missed maintenance.
Inboard engine servicing: diesel, shaft and sterndrive
An inboard diesel brings more items onto the list: engine oil and filters, fuel filters and the water separator, the raw water impeller, the heat exchanger and its anodes, belts, hoses and hose clips, and the gearbox oil. The shaft, its seal and the cutless bearing should be checked when the boat is out of the water, along with the propeller and the shaft anode. On a sterndrive the bellows and the drive oil deserve particular attention, because a failure there can let water into the boat.
Much of this is routine, and much of it can be done by a competent owner. The parts that cause the expensive failures, however, are often the cheap ones: an impeller that loses its vanes, a raw water strainer that blocks, a hose clip that corrodes through. Changing them on schedule rather than when they fail is the difference between a planned job in the yard and a tow home.
Engine service log: what to record and why
A service log is the engine's medical record. It should show the date, the hour meter reading, what was done and by whom, and which parts were fitted, with the invoices filed alongside. Add the engine plate details, the serial number and photographs of the installation. The maintenance record on this site can be printed and kept on board, so that every service, every impeller change and every fault is written down where you can find it again.
The log pays off in three situations: when you sell the boat, when a dealer considers a warranty claim, and when a surveyor looks at a failure and has to decide whether it was sudden or the result of neglect. In each case a continuous record with dates and hours carries far more weight than a recollection, and it costs a few minutes after each job.
Servicing a boat engine yourself or at a dealer
Doing your own servicing is perfectly normal on many boats, and done carefully it is as good as a yard service. Where machinery cover is in place, check its servicing condition: ours requires a specialist firm. Two further things are worth bearing in mind. A new engine under the maker's warranty may need servicing by an authorised dealer to keep that warranty, so read the conditions before you pick up the spanners. And a DIY service should be recorded as thoroughly as a professional one, with receipts for the parts and oils used and a note of the hours.
For major work, such as a timing belt, injector servicing or a gearbox overhaul, a specialist is usually the better choice. Keep their report with your own log, and ask for any parts that were replaced to be kept until you have seen them. If something goes wrong later, the combination of your own records and the dealer's invoices tells the engine's story in a way that is hard to dispute.
Worth remembering
From outside
is what hull wordings are written for
From inside
is a separate agreement or nothing
The service record decides the second one, and it is written long before anybody opens the engine hatch.
Questions
What owners ask us about this
Is machinery damage part of ordinary hull cover?
Usually not. Hull wordings are written around events that come from outside, while an internal breakdown is dealt with in a separate agreement, if it is dealt with at all.
Does the age of the engine matter?
In many wordings yes. Ours stops at ten years; others stop at a stated age or a number of running hours, and some ask for a survey of the installation beyond that point. It is the first thing to check.
What paperwork will be asked for after a failure?
The service record, the hour meter reading, the engine plate and the invoice for the last major work. Collected before the season that takes minutes, afterwards it takes weeks.
How often should a boat engine be serviced?
According to the maker's schedule, usually a set number of running hours or once a year, whichever comes sooner. Boats used little still need the yearly service, because seals, impellers and fuel age without running.
Does a service I did myself count as evidence?
As a record, yes, if it is kept properly: date, hours, what was done and receipts for the parts and oils. Our machinery cover, though, requires servicing by a specialist firm. Under a maker's warranty, check whether an authorised dealer is required.
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