Factory-authorized MAN engine service on San Francisco Bay
From routine intervals to repowers, warranty repairs, and dockside support — Helmut’s Marine Service keeps your MAN diesel running to the standard it was engineered to meet.
35+ years servicing marine diesel engines across the Bay. Family-owned, authorized MAN dealer, with dockside mobile service throughout the Bay Area.
The full MAN marine line
From the compact in-line six to the flagship big-bore V12X — our shop services every family in MAN’s recreational and light-commercial range.
MAN i6
730–850 hp · 12.4 L in-line six
MAN v8
1,000–1,300 hp · 16.2 L V8
MAN v12
1,400–2,000 hp · 24.2 L V12
MAN v12X
2,000–2,200 hp · 29.6 L V12
Complete MAN service under one roof
As an authorized MAN dealer, Helmut’s Marine Service Inc services your engine to MAN’s factory specifications using genuine parts and manufacturer-supported procedures, backed by decades of marine diesel experience on the Bay.
Scheduled Maintenance
Service performed to MAN’s published intervals — oil and filter changes, valve checks, cooling and fuel system care, fully documented.
Diagnostics and engine management
Manufacturer-spec diagnostic equipment to read fault codes, calibrate, and resolve electronic and mechanical issues fast.
Warranty Repairs
Authorized warranty work handled in-house — we diagnose, repair, and file the claim so covered repairs stay at no cost to you.
Repowers and Installs
Full repower planning and installation, from engine selection and mounts to alignment, commissioning, and sea trial.
Fluid and Oil Analysis
Lab-grade WearCheck sampling spots wear, contamination, and coolant issues before they become failures — and protects warranty records.
TWIC-Carded Technicians
Secured port, commercial terminal, or your slip — our technicians are cleared to service your vessel wherever it’s tied up.
MAN Warranty Coverage & Support
Every new MAN engine is covered by MAN’s factory warranty against defects in material and workmanship, with extended coverage available on major components. As an authorized MAN Engines dealer, Helmut’s Marine Service diagnoses and completes covered repairs here on the Bay and handles the claim with MAN directly, so you don’t chase paperwork or ship your boat elsewhere.
MAN factory warranty
New MAN pleasure-craft engines are covered by a factory warranty against defects in material and workmanship, with extended coverage available on major components.
Genuine MAN parts installed in our authorized workshop carry a 24-month worldwide warranty; labor coverage varies.
Warranty terms summarized here are governed by MAN Engines’ published limited warranty documents and depend on engine model and rating; the HMS service warranty applies to labor and parts on work performed by Helmut’s Marine Service and excludes neglect, accident, improper operation, and unauthorized modification. Contact us for the full terms that apply to your engine.
Keep your warranty valid
MAN coverage stays in force when the engine is maintained to specification and the service history is properly documented. That’s exactly what we deliver — and we keep the records for you.
1. Service on schedule
We track and perform required maintenance intervals according to MAN’s published service requirements.
2. Genuine parts & fluids
We use genuine MAN parts and approved fluids to help ensure your engine is serviced to factory standards.
3. Documented history
We maintain detailed service records so you have clear documentation of the work performed on your engine.
4. Authorized Service & Repair
Warranty-related diagnostics and repairs are handled by trained technicians using MAN-approved procedures and service information.
Schedule Your Service today
Bring your vessel to our San Rafael facility, or have our techs come to you with our mobile services. We serve commercial operators and yacht owners across the Bay, and respond to emergency calls.
