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There are less maintenance tasks to carry out on a saildrive transmission than on a traditional inboard shaft drive system with its associated stern gear. For example, you don’t have to worry about engine alignment, cutless bearings and stern glands. I owned a boat for seven years that had a Volvo Penta saildrive transmission system and this caused no problems during my ownership. The same applies to Yanmar saildrive systems.

However, there are a few critical things that require maintenance. These are as recommended in detail by the engine manufacturers and should be adhered to.

Corrosion

  • Drive leg housings are made from aluminium and they must therefore be well protected from corrosion, requiring a special copper-free antifouling paint, plus undercoats. The housings also need dedicated sacrificial zinc anodes to prevent them from galvanic corrosion.
  • Carefully inspect the drive leg for any damage to the paintwork. Any exposed aluminium will quickly corrode in salt water. Look for any white corrosion beginning to form on places where paint may have been chipped off. If any such damage is found it will need to be ground back before the unit becomes seriously damaged.
  • Anodes are designed to protect saildrives from electric currents generated while in sea water.
  • The electrical system of the engine will need to be an isolated system and not one which is grounded to the battery negative.
  • When a non-aluminium propeller is fitted, additional anodes are required.

Oil change

  • Regular checks of saildrive transmission oil are important. Any signs of milky coloured oil indicate water has found its way into the system. This could occur because of a shaft seal failure or defective drain plug seal.
  • Manufacturers usually recommend that the transmission oil is changed annually, which can only be done ashore by draining the oil from the base of the leg. On some systems the oil can be removed using a hand pump operated from the engine bay. In order for the oil to drain completely, remove the filler cap on top to allow air in.
  • Always use the manufacturer’s recommend oil and be careful not to overfill the system.
  • Be aware that some manufacturers recommend a torque setting for the oil drain plug and also advise that the seal is replaced regularly, because if there is the smallest crack in the rubber seal it will leak.

seal saildrive maintenance

Rubber seal

  • The saildrive leg passes through a thick rubber seal that attaches to the base of the hull. Yanmar sail drives differ from Volvo Penta so it is worth checking with the manufacturer’s recommendations. Volvo recommending replacing seals after 7 years while Yanmar recommend replacing their sail drive seals every two years, which is quite a difference. Replacing sail drive seals is a fairly major job which has to be done ashore and entails lifting the engine. The part itself is pricey but significant additional cost needs to be factored in for the engine lift and labour involved.

Seized fixings and fastenings

Maintaining a boat can be a rewarding experience but at times it can also be frustrating. A prime example of this is when you come across a seized fixing or fastening that refuses to budge. Read our tips on how to release and fix them:

Wooden Hulls – Part 2

It is important to ensure the essential hull maintenance of a wooden boat is done, even if you are paying others to look after your boat for you. The priority is to prevent rot from taking hold. The protective layers of paint and varnish over wood are far more critical than on GRP boats, where the topsides are painted more for cosmetic reasons.

Boat engine cooling systems

Some boat engine breakdowns are unavoidable but those caused by lack of maintenance or regular checks can be avoided. Failure to maintain an engine’s cooling system is a well known example of this, so it is well worth spending time checking over the cooling system both when the boat is ashore and afloat.

Boat interior varnishing

Most boat interiors have a combination of varnished and painted surfaces including solid wooden joinery, plywood laminates with thin hardwood veneers and glass reinforced plastic. When making your assessment of what you are going to do, bear in mind that the varnishing process consumes a lot of time, especially if the existing surfaces are in poor shape.

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Jester Challenge 2022 – Sailing single handed from Plymouth UK to the Azores: Part 7 – Motivation

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Liferafts

Liferafts should be stowed where they are ready for immediate launching. All crew should know the location of the liferaft and know how to launch, inflate and board it. They should also know what equipment it contains.

Peer to Peer yacht charter – How can you monetize your boat?

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Boat maintenance below decks

While most interior maintenance work can be done when a boat is afloat, some jobs such as servicing the seacocks have to be done ashore. It makes sense to do any major interior repairs and improvements with the boat hauled out in the boatyard.

Common marine electrical problems

Most problems with marine electrical systems arise from four possible sources, a lack of maintenance, a poor standard of initial installation, insufficient battery capacity, or ineffective charging systems.
Water ingress is a frequent issue – salt water can corrode contacts very quickly. If connections are not scrupulously clean – or are loose – resistance will be increased, resulting in progressively reduced power.

2023 Rolex Fastnet Race – Part 2

Simon Jollands took part in the 2023 Rolex Fastnet Race. This is the second of his articles on the race aboard Lancelot II, a Beneteau First 40.

Boatyard Health and Safety

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Sail trimming for cruisers

Sail trimming tips for cruisers. Whether racing or cruising, a well tuned boat will sail faster and tend to heel less than a boat with badly adjusted sails.

Boat decks and superstructure

The deck of a boat is constantly exposed to the elements and should be inspected on an annual basis. Particular attention needs to be given to the overall condition of deck fittings such as the stanchions, cleats and chainplates.

Going aground – what to do if it happens to you

When a yacht runs aground, it can be a stressful situation, especially on a falling tide in an exposed position with a swell running. There are several steps you can take to address the situation in order to ensure the safety of your vessel and its occupants. Here are some tips should this happen to you.

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Safe Skipper – crew management tips

Effective crew briefings are a vital part of the good on-board communication that helps everything to run smoothly on a sailing vessel at sea, whether it is cruising or racing.

Essential Knots: Figure of eight

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Fire safety advice at sea from the Marine & Coastguard Agency

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Repairing a leaking hull-to-deck joint

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Boat electrics

All boat owners should have a basic knowledge of electrics, both to avoid encountering electrical problems at sea and to stand a chance of solving them should they occur.

Electric motors and hybrid systems

In recent years there have been considerable advances with the development of electrically powered propulsion in the leisure marine sector. This includes developments with inboard and outboard electric motors, hybrid systems, lithium-ion battery technology as well as solar, wind and hydro powered generators.

Estimating your position at sea

Navigators use a combination of techniques to estimate their position at sea. The primary method used today is GPS (Global Positioning System), a network of 24 satellites that became fully operational in the 1990s and was originally restricted for use by the United States military.

Boat batteries

Under-sized battery banks are one of the key factors behind power failure at sea, as well as the premature failure of batteries, so make sure that your boat battery measures up to the use you want to put it to.