Catalina 34 Engine Repower / Replacement

Monohull Sailboats

Repower Specifications

LOA: 34.5’
LWL: 29.83’
DISPLACEMENT: 11,950 lbs
BUILDER: Catalina Yachts USA


Another extremely successful offering from Catalina.  The 34 has always been appreciated by owners for predictable sailing and accommodating cruising ability.


Original builds from 1985 started with a Universal 21 hp diesel. As the years went by, power increased with options up to 30 HP diesel.

Repower Recommendations

The Beta 25 is a fine replacement engine for the Catalina 34. It produces the power you need for motoring and low speed handling, while also providing excellent efficiency. The Beta 25 fits the engine compartment with minimal or even no modification required. The Beta 30 is also available for those that feel the extra power makes a difference in their use of the vessel.

Repower Recommendations

The various Beta Marine off the shelf mounts can be combined in any configuration to closely match the many different engine bed configurations that are found in the Catalina 34.  Please call us to discuss your current installation and best repower options.

Installation Considerations


  •     The Catalina 34 exhaust routing is somewhat unique. We have the information and parts you need to make sure the exhaust routing is installed in the safest, most effective and cost efficient manner.
  •     The Beta 25 and 30 HP engines are available with off the shelf mounts in different widths to best suit your engine beds.
  •     With the success of the Catalina 34 as a cruiser, the larger 120 amp Beta alternator is a popular option. This alternator is a great value with plenty of output for larger battery banks and the ability to be externally regulated.
  •     Different propeller sizes were used on this vessel. Beta Marine will be happy to assist in a correct propeller sizing for your particular craft and the hp engine chosen.

Other Resources

The Catalina 34 is one of the most common boats we repower with Beta Marine diesel engines. We have extensive experience with engine replacement on this model and the variations that came about over the years. We have pictures, drawings and measurements for reference as well. Contact us to discuss your boat in more detail, or add to our forum discussion on this specific boat model through the link below.

Catalina 34 Repower – Forum Discussion


Key Search Terms:

Catalina 34 repower          Catalina 34 engine replacement

Catalina 34 diesel engine      Catalina 34 Beta Marine diesel

Catalina 34 Universal

Universal 21

Universal 30