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Bayliner 3988 Motoryacht

The published record on this model and what owners report, with the questions worth asking while a boat is still a listing. This page covers the model. Every boat still needs its own homework.

A comfortable diesel aft-cabin cruiser well suited to the Loop, but check propping, aging aluminum fuel tanks, and true air draft with the enclosure up.

The Bayliner 3988 Motoryacht is a roomy mid-1990s to early-2000s aft-cabin diesel cruiser with a modified-V hull, prop pockets to reduce shaft angles, and a shallow draft that makes it a plausible Great Loop platform. It ran roughly 1995–2002 and was fitted with several engine options over the run, most commonly Cummins 6BTA 5.9 diesels (270 or 330 HP), with earlier boats sometimes carrying Hino WO6 250 HP diesels. Its defining buyer concerns are overpropping (which drives overheating and sooting), aging aluminum fuel tanks, and a flybridge enclosure that can exceed the arch height.

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How to read the tags on this page. CLAIMstated by one source, not yet confirmed QUESTIONopen, and settled by looking at the boat itself CONTEXTbackground on how this model is built or used Sources are linked where published.

Fuel system

QUESTION
What is the condition and age of the aluminum fuel tanks, especially starboard? Aluminum fuel-tank corrosion is a known, model-relevant issue on the 3988, with the starboard tank singled out as problematic. Owners report these tanks tending to fail around the 15–20 year mark; given the production years, most hulls are now well past that window. Removal is a major job that can involve engine removal, so one owner repaired a corrosion pinhole leak with epoxy floated inside the tank rather than pull it. Filler hoses are also worth checking when diagnosing any fuel smell or leak. src: Bayliner Owners Club
Your move: Inspect both tanks for weeping, staining, or prior epoxy repairs; ask the owner about any tank work and get any repair details in writing.

Air draft

CLAIM
Flybridge enclosure can stand taller than the radar arch The published arch height is around 14'10", but the enclosed flybridge canvas can be taller than the arch. One owner would not chance getting under 17 ft, and another uses 18 ft as his rule-of-thumb minimum with the enclosure and arch-mounted electronics up. The controlling number is not the arch alone but the tallest fixed point when configured for cruising. This model tends to have height you can reduce by dropping the enclosure and folding the arch. src: Bayliner Owners Club; Knot 10 listing
Your move: Measure the true air draft to the tallest fixed point with the enclosure and antennas as you'll run them, and identify what can be lowered.

Range and fuel burn

CONTEXT
Planing burn is roughly 1 NM/gal; slow-cruise burn is much lower Owners of Cummins 330 boats report about 1 NM/gal cruising at 20–24 kts. Hino 250 boats are more economical, with one owner planing near 1,500 RPM at 12–16 kts averaging ~4 gph. At displacement Loop speeds (~8–9 kts) burn will be far below the planing figures, but no reliable model-specific slow-cruise number is documented, so plan from your own boat's data. src: Bayliner Owners Club; Boatered forum
Your move: On sea trial, log gph at a steady 8–9 kts to establish your real Loop-speed burn and range.

Handling

CONTEXT
Prop pockets and shallow draft suit inland cruising The modified-V hull uses prop pockets to reduce shaft angle, and draft is shallow (around 3'3"), which is favorable for the shallower stretches and lock approaches of the Loop. As a planing-hull motoryacht it will be most efficient trolling at displacement speeds inland and can plane for open runs. src: Knot 10 listing; PowerBoat Guide / Denison spec

Engines

The engines research is part of the full profile inside the product. It covers factory options, tested performance and the engine-specific questions in our members' dossiers, and it travels with every dossier and survey brief built on this model.

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