Skip to content
Oli working in the engine bay of a Thames boat servicing a marine diesel.

Engines & Mechanical

Engine repairs

Diagnosis, repair, and rebuild work across all common marine engine types, with a clear plan and an honest timeline before any spanner comes out.

Overview

Honest engine work, properly diagnosed.

Most engine problems are not as dramatic as they sound from the cockpit. The trick is taking the time to listen, look, and measure before making changes. We work on inboard diesels, outboards, shaft drives, and saildrives across the London to Oxford waterways, and the diagnosis comes first.

Whether it is a starting issue, a cooling fault, smoke, vibration, or a power loss that has crept in over the season, you get a plain-English explanation of what is happening, what it will cost to put right, and the realistic options if a full repair is not the best route for your boat.

Parts are ordered to suit the engine, not the easiest stock match. Where common marinised parts will do the job properly, that is what gets fitted. Where a manufacturer original is needed, that is what gets sourced.

What's included

What an engine repair typically covers.

Every job is scoped to the boat, but most repair visits include a mix of the following.

  • Cold and hot running diagnostics, including compression, exhaust, and cooling checks
  • Fuel system work: filters, lift pumps, injectors, bleed and prime
  • Cooling system: impellers, heat exchangers, hose runs, header tanks
  • Electrical: starter motors, alternators, charging faults, wiring repairs
  • Belts, mounts, couplings, and shaft alignment as needed
  • Service items refreshed if they are due, so you are not paying for a second visit
  • Sea trial or in-berth load test once the work is complete
  • Written record of what was changed and what to watch in the next 50 hours

Process

How an engine repair runs.

  1. Tell Oli the symptoms

    Phone or email with what the engine is doing, when it started, and any work done recently. Quick triage often saves a wasted visit.

  2. On-board assessment

    A site visit at your mooring to confirm the fault, take readings, and agree the scope before any parts are committed.

  3. Repair carried out

    Work done at your boat where possible. Parts sourced from trusted marine suppliers. You are kept in the loop on findings.

  4. Tested and signed off

    Engine run under load, settings checked, and a brief written summary so you know what was done and why.

  • City & Guilds qualified

    Properly trained marine engineering, not handyman improvisation.

  • Mobile to your mooring

    Work happens at your boat wherever possible, saving time and hassle.

  • Breakdown callouts

    Stuck on the water? Get in touch and a callout can be arranged.

  • Fully insured

    Public liability cover in place for every job, on every boat.

Ready when you are

Book engine repairs for your boat.

Tell Oli about your boat and what you need. Quotes are honest, the work is done at your mooring, and the schedule is yours to choose.