Maitreya underwent a repower in August 2008.

The 32 year old Farrymann two cylinder diesel had started leaking from it's water jackets. We decided that it was time to bite the bullet.

We opted for a Yanmar 4 cylinder 4JH4E that would produce 54 horsepower at about 3000 RPM. Bill Ingle from Bill's Marine/Golden State Diesel Marine in Oakland did the majority of the work. Metal Magic built the custom mounts to lower the engine, attach them to the beds and also provides mounting surfaces for auxillary equipment

The main issues were:
  • Installation of new motor mounts over the existing steel bed.
  • Enlargement of the exhaust system from 1 1/2 to 3 inch diameter hoses and through-hull.
  • The enlargement of the raw water intake supply pathway from 3/4 inch to a 1 inch diameter.
  • Constructon of mounts for the hydraulic pump and Electrodyne ES80 high output, brushless alternator.
  • Removal and later reinstallation of the cockpit sole to expedite the replacement of the power plant.
  • Movement of four 6 volt batteries to clear space for an enlarged exhaust and muffler lift chamber.

  • The enlargement of the intake and exhaust systems are required by Yanmar both for warranty and performance. There is a very good discussion of the practical side of these installation details at The Yanmar Engine Help Site.

    The largest single task was enlarging the exhaust through-hull to 3 inches. It took two of us 3 to 4 hours of boring with a carbon encrusted hole saw on a hand held drill motor. This picture, is a close up of the core of the hole. There is about 1/4 inch of bronze, 1 inch of concrete reenforcedwith steel and another 1 1/2 inches of fir backing block. On a fiberglass boat, you could probably drill this hole in about a minute.
    Here is another picture of the old through-hull and the hole core.
    This is the external view of the new 3 inch exhaust through-hull.
    This is a picture of the new cone-clutch transmission, propeller shaft and coupling right after intial alignment. The seizing wire for the coupling bolts has not yet been installed.
    This shot shows a closeup of the new 1 inch raw water hose leading from the existing strainer to the pump. This hose was enlarged from 3/4 inch. An additional 3/4 inch through-hull was added, expanding the intakes to 1 1/2 inchs prior to the strainer. The raw water intakes are on opposite sides of the hull to reduce the chance of blockage by external debris.
    A front view of the new engine. At the top right you can see the new Racor MA500 fuel filter. The raw water pump is at the bottom right with the yellow decal. The hose from the strainer leads into the picture from the right. In the center, is a double pulley which is an option from Yanmar. At the bottom left you can see the custom mounting surface that will carry the hydraulic pump to drive the anchor windlass. The custom exhaust mixing elbow and exhaust hose are at the top of the picture.
    A view from above the new engine while the cockpit floor was still out. You can see the raw water intake and strainer in the top left. Behind the cooling housing, the raw water exits the engine. The hose leaves the picture at the left where it reaches an anti-siphon valve (not shown) placed high up under a cockpit seat. The hose then leads back to the the custom mixing elbow made by Metal Magic of Oakland. At the bottom, you can see the new larger exhaust lift sump.
    The new control panel was placed into an enlarged hole where the old instruments lived. This photo shows the installation before trimming. The panel is located next the companion way ladder inside the cabin. We felt this was safer than below the seats in the cockpit. Breaking waves have the potential to fill the cockpit and damage instruments located there.