Marine & industrial

diesel engine & injection repair specialists

Casco Bay Diesel & Injection Services has been trusted by the Pros for over 30 years. With experience in marine and industrial, we are well-qualified to get you back up and running.

Certified & trained dealers for these brands

Sportfishing

Pleasure / yachting

Commercial marine

Industrial off-highway equipment

Fuel injection systems

Generator services

Emergency/ first response vessels

Testimonals

What our clients say about Casco Bay Diesel

How was your expereince with Casco Bay Diesel? Click the Google icon below to leave a comment.

United States Coast Guard

"Mr. Chamberlain’s work ethic and experience throughout the retrofit, coupled with his willingness to teach, instilled a higher level of expertise on our ship GRAND ISLE I would have not believed possible. On behalf of my entire crew, I wish to thank Mr. Chamberlain for a job well done."

Matt Stedman

"Bob, Gaylen, and the boys at CBD have been nothing short of incredible , dependable, and trustworthy part of my boating program. I’m very happy to have CBD in my network when that time comes."

Kevin Simons

"From the very start they were quick to respond, professional and provided all the info I needed to make educated decisions about the rebuild. Galen and his team are very experienced professionals. I will be calling Casco Bay Diesel for all of my needs for my boat and generator!"

Casco Bay Diesel & Injection Service Partners

We are certified & trained dealers for these brands

Marine & Industrial Diesel Engine & Injection Repair

We help you Get back up & Running

cascobaydiesel

CB Diesel & Injection Service Diesel engine repair and injection pump shop locations in Portland ME and Cape Cod MA (207) 878-9377 Cell (207) 650-0176... more 470 Riverside St, Unit 7, Portland, Maine 04103

For Sale – Cummins 6BTA 5.9 315 HP @ 2800 RPM Ful

For sale! Running take out Yanmar 4JH80 @3200 with

Big winter work going on with the boys in our Port

We perform many different test to determine the he

We are a full service shop with two locations and

Tonight we had our end of year company dinner and

Rebuilding engines just isn’t tearing things apart

It’s that time of year in both our locations where

Big repower going on at our Portland location. Tw

Big week at Casco Bay Diesel Cape Cod location. Go

We are beyond excited to officially announce that

Beautiful job on this Cummins 6CTA 8.3 by our guy

Going into Fall busy at both our Casco Bay Locatio

This was a big job converting this Cummins 6.7 to

Here at Casco Bay Diesel Hyannis location, The tra

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Frequently Asked Questions

Answers to your most common questions

Casco Bay Diesel strives to be as transparent as possible. We answer all your most asked questions to the best of our ability.

Got a question? Ask us by emailing info@cascobaydiesel.com or give us a call on (207) 878-9377.

Does Casco Bay Diesel offer mobile or on-site marine repair?

Yes, Casco Bay Diesel provides full-service mobile and on-site diesel repair for marine and industrial equipment across New England, specifically serving the coast from Portland, Maine, to Hyannis, Massachusetts.

Are you an authorized dealer for Yanmar or Cummins?

Casco Bay Diesel is a certified and trained dealer for major brands including Yanmar, Cummins, Scania, and MAN, providing authorized parts, warranty work, and specialized diagnostics.

Can you help if my diesel engine is out of warranty?

We provide comprehensive repair and maintenance services for diesel engines, transmissions, and fuel injection pumps regardless of warranty status, utilizing dealer-level diagnostic tools for all major makes.

What is included in a marine diesel engine survey?

Our marine engine surveys include an in-depth visual inspection, computerized diagnostic testing, sea-trial data recording, and oil analysis for both the engine and transmission.

How often should I service my marine diesel engine?

Marine diesel engines typically require maintenance at specific hourly intervals (starting at 200 hours). We recommend annual inspections or descaling the cooling system every 2 years or 500 hours to ensure peak performance.

Do you repair fuel injection pumps and injectors?

Yes, we operate a full-service fuel injection shop capable of testing and rebuilding mechanical injectors, electronic common rail injectors, and fuel injection pumps.

What geographic areas do you cover for dockside service?

We offer dockside and on-site service throughout Maine and Massachusetts, with primary shop locations in Portland (ME) and Hyannis (MA) to serve the greater New England area.

Can you perform EPA Tier III and Tier IV engine diagnostics?

Our technicians are equipped with the latest electronic diagnostic software (MAN-Cat, CAT ET, Cummins Insite, etc.) to service modern, electronically controlled EPA Tier III and IV compliant engines.

Do I need to be present for my boat’s engine repair?

While we welcome owners, you do not need to be present for scheduled repairs. We provide detailed reports and communication via email or phone throughout the service process.

Why is my marine diesel engine producing white smoke?

White smoke is often normal at startup due to water vapor; however, persistent white smoke may indicate poor fuel quality, low compression, or faulty fuel injection components requiring professional diagnosis.