1975 Bertram 31
$134,999
Boat in Merritt Island, FL 32952 US
Built in 1975
31
2 Engines (2x Cummins)
31 feet
Diesel
Fiberglass/Reinforced
The Bertram 31 isn't just a boat; it's a maritime icon. Since its debut in the early 1970s, it has set the gold standard for sportfishing vessels, prized for a "go-anywhere" ruggedness that few modern hulls can match. This specific 1974 model embodies that legendary pedigree, combining the famous deep-V performance with significant modern upgrades.
The Legend of the Deep-VThe Bertram 31 earned its reputation by conquering rough water that keeps other boats at the dock. Its hull design provides a stable, dry ride in heavy seas, making it the ultimate platform for serious offshore anglers and coastal cruisers alike. While compact enough for easy handling, its massive cockpit and functional cabin provide the versatility needed for everything from tournament fishing to weekend getaways.
2022 AWLGRIP Paint
New Main Engine Risers 2023
New Main Engine Turbos 2023
Belt Tensioners And pulleys replaced 2024
2025 Bottom Job
Cummins Engines Installed 2003
The Company offers the details of this vessel in good faith but cannot guarantee or warrant the accuracy of this information nor warrant the condition of the vessel. A buyer should instruct his agents, or his surveyors, to investigate such details as the buyer desires validated. This vessel is offered subject to prior sale, price change, or withdrawal without notice.
Price History
| Date | Event | Price |
|---|---|---|
| 4/14/26 | Price decreased | $134,999(-10.0%) |
| 3/23/26 | Initial price | $149,999 |
1975 Bertram 31 Video Tours
Boattest.com Review
Overview
This review examines the impact of repowering a 1981 Bertram yacht with modern Yanmar 6LP series diesel engines. Originally equipped with two 330 horsepower Mercruiser 454 gasoline engines, the vessel underwent an upgrade to twin Yanmar 6LPA STP II diesel engines. This transition not only improved efficiency and operational security but also added value by reducing weight and fuel consumption while freeing up valuable engine room space.
Engine Design and Installation
The Yanmar 6LPA STP diesel engine features a compact design that fits easily within the existing engine stringers of the Bertram, creating an additional 3 inches of space on the inboard side and sufficient room on the outboard side to accommodate a small generator. The aft end of the engine also gained 5 inches of clearance. Despite its compact profile, the engine maintains accessibility to key maintenance points, including oil dipsticks on both sides, a spin-on oil filter, a secondary fuel water separator filter, and a primer pump located on the inboard side. The heat exchanger is positioned high on top with hoses routed around the front, while the stainless steel mixing elbow, wet turbocharger, compressor, and air intake are arranged efficiently at the aft end. The transmission cooler and hoses are located below these components. This layout significantly improves space utilization compared to the original large-block gasoline engines, allowing easier access to batteries and additional equipment placement.
Engine Specifications and Performance
The 6LPA STP is a 6-cylinder, 4-stroke, 4.1-liter turbocharged diesel engine equipped with an intercooler and a fresh water cooling system, which is considered optimal for marine applications. It delivers a continuous rating of 255 horsepower at 3600 RPM and a maximum output of 315 horsepower at 3800 RPM, weighing 899 pounds. The repowered Bertram achieved planing in 5.3 seconds and reached 30 mph in 8.4 seconds. At maximum RPM (3911), the engines consumed 29.4 gallons per hour, providing a range of 254 miles at 37.4 mph. Operating closer to the continuous rating at 3500 RPM, fuel consumption dropped to 23.3 gallons per hour, extending the range to 292 miles at 34 mph. The most economical cruise speed was 20.1 mph at 2250 RPM, yielding a range of 401 miles. These figures highlight the improved fuel efficiency and extended cruising capabilities afforded by the diesel repower.
Operational Benefits and Owner Experience
The repower delivered significant benefits including reduced engine weight, increased available space, and easier maintenance access, all contributing to safer and more economical operation. The owner noted that the only unexpected cost was repainting the waterline due to an overall weight reduction of approximately 3,000 pounds from the new engine installation. The diesel engines provide peace of mind through reliable and efficient performance, promising many years of enjoyable boating. The reviewer also emphasizes the advanced engineering of Yanmar's latest diesel models and recommends considering Yanmar power for both repowers and new yacht specifications.
Overview from around the web 1975 Bertram 31
Customers often praise the 1975 Bertram 31 for its classic styling and solid construction
Many highlight its sturdy hull and dependable performance, making it a favorite among anglers and cruising enthusiasts alike. Owners appreciate the spacious cockpit and comfortable cabin layout, which provide both functionality and comfort for extended trips. The boat's timeless design and reputation for durability continue to make the 1975 Bertram 31 a sought-after vessel in the used boat market.
The Biggest Pros and Cons
The 1975 Bertram 31 is a classic sportfishing boat known for its solid construction and timeless design. Here are some of the key pros and cons of this model:
Pros
Durable Build: The Bertram 31 features a robust fiberglass hull with a deep-V design, providing excellent stability and a smooth ride even in rough seas.
Classic Style: Its iconic lines and vintage appeal make it a favorite among enthusiasts and collectors.
Spacious Layout: The boat offers a comfortable cockpit area and a functional cabin with sleeping accommodations, making it suitable for overnight trips.
Proven Performance: Equipped with reliable inboard engines, it delivers good speed and maneuverability for sportfishing and cruising.
Good Resale Value: Due to its reputation and build quality, it tends to hold value well in the used boat market.
Cons
Aging Systems: Being a vessel from 1975, many of the mechanical and electrical systems may require updates or maintenance.
Fuel Efficiency: Older engine designs typically consume more fuel compared to modern counterparts.
Limited Modern Amenities: The boat lacks some of the contemporary features and conveniences found on newer models.
Maintenance Intensive: The age and design may demand more frequent upkeep, especially regarding the hull and engine components.
Weight: The sturdy construction adds weight, which can impact speed and fuel consumption compared to lighter, more modern boats.
Made For
The 1975 Bertram 31 is ideal for boating enthusiasts who appreciate classic design combined with reliable performance. It’s perfect for anglers seeking a sturdy and spacious vessel for offshore fishing, as well as families and cruisers looking for a comfortable and stylish boat for day trips or weekend adventures. With its timeless appeal and solid construction, the Bertram 31 caters to those who value durability, versatility, and a touch of vintage charm on the water.
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 1975 Bertram 31 | |||||
|---|---|---|---|---|---|
| $134,999 | $129,990 | $125,900 | $99,998 | $99,000 | $179,900 |
| Merritt Island | Homestead | Fort Myers | Key West | Fort Lauderdale | Miami |
| 31' | 47' | 47' | 31' | 43' | 43' |
| Cummins | Detroit | - | Yanmar | DETROIT DIESEL | Detroit Diesel (Rebuilt 2020) |
| 270 hp | 570 hp | - | 375 hp | - | 550 hp |
| 63 | 28 | 54 | 84 | 841 | 69 |
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Address
Boat Location
Contact Bond Yacht Sales about 1975 Bertram 31
810 Scallop Drive, Port Canaveral , FL, 32920
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