Immaculate 1998 Sea Ray 400 Express Cruiser — Twin CAT Diesels, Extensive 2025 Upgrades, Annapolis, MD
A rare opportunity to acquire a meticulously maintained 44-foot express cruiser in exceptional condition, professionally surveyed August 2025 and backed by current oil analysis reports on both engines. This Sea Ray 400 combines a low-profile, shallow-draft hull with twin Caterpillar 3116 diesel power — a combination that delivers genuine offshore capability, economical passage-making, and impressive speed in a package that turns heads at every marina.
Powered by twin Caterpillar 3116 350 HP diesel inboards (700 HP combined) with only 950 hours, this boat cruises comfortably at 24 knots burning approximately 28 GPH total, with a documented 847-mile AICW passage averaging just 15–20 GPH at mixed speeds. ZF Marine 220A1 transmissions and 2-inch stainless steel shafts with dripless seals round out a bulletproof drivetrain. Oil sample reports for both engines are available upon request.
Upgraded extensively in 2025 for extended off-grid cruising, the boat features a new 320 Ah Li Fe PO4 lithium battery bank capable of 48 hours of DC operation, a Rocna Mk II 25 (55 lb) anchor with 150 ft of G4 chain and Lofrans Progress.1 windlass, new inflatable tender with outboard on an Adventure Marine davit system, and new shore power cords. The two-stateroom, one-head layout with separate shower sleeps four comfortably, with the salon sofa converting to additional berths for guests.
The 8 k W Westerbeke diesel generator (under 800 hours) powers dual Cruisair Marine HVAC units (8,000 BTU each), water heater, and all galley appliances. Navigation electronics include dual Garmin chartplotters, sonar/fishfinder, and radar — everything needed for confident day or night coastal and offshore passages.
KEY FEATURES
• Twin Caterpillar 3116 Diesel Inboards — 950 Hours, Oil Analysis Verified
The CAT 3116 is a legendary marine diesel known for its durability, parts availability, and fuel efficiency at cruise. With only 950 hours and current oil analysis reports confirming excellent internal condition, these engines represent outstanding value. Diesel power also means lower fuel costs per mile compared to gasoline alternatives, and the direct-drive configuration eliminates sterndrive maintenance concerns entirely.
• 320 Ah Li Fe PO4 Lithium Battery Bank (New 2025) + 8 k W Diesel Generator
The 2025 lithium battery upgrade transforms this boat into a genuine liveaboard-capable vessel. Li Fe PO4 chemistry offers significantly more usable capacity, longer cycle life, and faster charging than traditional AGM banks — allowing up to 48 hours of DC operation before needing to run the generator. Combined with the low-hours Westerbeke diesel generator and dual HVAC units, this boat is ready for extended stays at anchor in the Bahamas, Florida Keys, or anywhere along the AICW.
• Dual Garmin Chartplotters + Radar + Sonar Navigation Suite
The helm is equipped with two Garmin chartplotters, radar, and sonar/fishfinder — a complete electronics package for safe coastal and offshore navigation day or night. Garmin's marine ecosystem is widely regarded for its intuitive interface and reliability, making this setup ideal for both experienced offshore captains and step-up buyers.
POWER & DRIVE
Engines: Twin Caterpillar 3116, 350 HP each (700 HP total)
Transmissions: ZF Marine 220A1
Shafts: 2-inch stainless steel, dripless shaft seals
Propellers: Four-blade bronze alloy, 24" x 18 pitch
Fuel Capacity: 300 gallons diesel (2x 152-gal aluminum tanks)
Cruising Speed: 24 knots (~28 GPH total)
Max Speed: 35 knots
Fuel Filtering: Dual Racor 75/1000-MAX primary fuel filter/water separators
GENERATOR & SYSTEMS
Generator: Westerbeke 8.0 BDT diesel, 8 k W, under 800 hours
Battery Bank: 320 Ah Li Fe PO4 lithium (new 2025)
Battery Charger: NOCO gen5x3 3-bank 15A onboard charger (new Oct 2025)
Shore Power: 2x 30A 120V outlets with new 50-ft cords (Sept 2025)
HVAC: Dual Cruisair Marine units, 8,000 BTU each
Water Heater: 11-gal AO Smith 120V
Fresh Water: 100 gallons
Holding Tank: 30 gallons
GALLEY & ACCOMMODATIONS
Staterooms: 2 (master + guest); salon sofa converts to additional sleeping
Head: 1 with separate shower
Refrigerator/Freezer: Isotherm CR195 by Indel Marine
Cooktop: Kenyon triple-burner ceramic glass
Microwave: Toshiba (new Dec 2025)
Stereo: Pioneer DEH-X with cabin and cockpit speakers
Cockpit: Seating for approximately 10, icemaker, and sink
ELECTRONICS & NAVIGATION
Chartplotters: 2x Garmin
Sonar/Fishfinder: Garmin
Radar: Yes
Searchlight: ACR Electronics RCL-100 remote-controlled
GROUND TACKLE
Anchor: Rocna Mk II 25 (55 lb) galvanized — one size up from recommended
Rode: 150 ft 5/16" HT/G4 galvanized chain + 100 ft 5/8" nylon
Windlass: Lofrans Progress.1
TENDER
New inflatable tender with outboard, rated for 3+1 persons; stored on Adventure Marine C-Ring davit (2025)
KNOWN ITEMS NOT WORKING
Autopilot inoperative
Spotlight tilt function inoperative (swivel works, one bulb functional)
LOCATION & SURVEY
Located in Annapolis, MD. Professional survey completed 15 August 2025. Oil analysis reports available for both engines. All owner's manuals scanned to PDF; printed engine, transmission, and generator manuals kept aboard. Comprehensive equipment list and spare parts reference document included with sale.
