I recently had Jay at Peninsula Diesel give the diesel engine on my sailboat a tune up and replace a wet muffler. Also, in the past, he's installed a PSS shaft seal and replaced an exhaust elbow....
Peninsula Diesel
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Peninsula Diesel, located in Moss Landing, California, has been a trusted expert in marine engine sales, service, and repairs since 1980. Serving both commercial and recreational vessels of all sizes, the company is committed to ensuring safety and performance on the water with a wide range of marine services and products.
As factory-authorized dealers for leading brands such as CAT, MAN, and Cummins, Peninsula Diesel provides comprehensive solutions that include troubleshooting, general repairs, and engine repower services. The company is also recognized for its quality used equipment offerings, catering to the diverse needs of its clientele, including local residents and government organizations.
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Reviews
Called for a quote for a repair and was told they don't have the tools to work on the issue. Peninsula Diesel in the Moss Landing boat yard didn't have tools to work on my diesel engine. Reading...

Talk about getting the job done. I had a blown head gasket on a Seine Skiff, they got me all fixed up and I never missed any fishing. Ive experienced all kinds of Marine Mechanics and shops from...

If getting your boat back with bad spark plugs when you left it there with new spark plugs tell you anything about this place, take the advise and find a different mechanic.
zero stars. unethical, unprofessional, incompetent these guys are not reliable or thrust worthy in any one's respectable opinion i was hauled out to do bottom paint on my sailboat, took the...
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