36.4 FT Vessel • 240 HP Inboard Diesel • ZF63-A Marine Transmission
Marine Engine Survey
Conducted by: Jeff Lendall & Sons — 805 Marine Diesel Mechanic
Comprehensive Yanmar 4LHA-STP marine engine survey conducted for a 36.4-foot vessel. This technical inspection included diesel engine evaluation, fuel-system assessment, cooling-system analysis, exhaust inspection, drivetrain review, oil analysis, and sea-trial verification.
Yanmar 4LHA-STP
ZF63-A
Oil Analysis
Sea Trial
Vessel Identification
| HIN / IMO | SHSM37145M79B |
|---|---|
| Official Number | 937675 |
| LOA | 36.4 FT |
Marine Diesel Engine
Engine Make: Yanmar
Engine Model: 4LHA-STP
Engine Type: Inboard
Power HP: 240
Fuel Type: Diesel
Hours: 1372
Serial Number: 58296
Transmission: ZF Marine Transmission ZF63-A
Yanmar 4LHA-STP engine evaluation confirmed that the diesel powerplant operates smoothly, maintaining optimal combustion efficiency with consistent idle and acceleration. The ZF63-A marine transmission engaged cleanly without clunk or lag. No leaks were detected from transmission seals or fittings, and vibration levels were minimal, indicating proper alignment and shaft balance.
ECM Computerized Findings & Visual Inspection
Sea Trial Report
The sea trial was performed under moderate conditions with full fuel and water loads. Start-up was immediate, idle was steady at 700 RPM, and engagement was smooth. Engine acceleration was linear through cruise to WOT at 2300 RPM.
| Sea Trial Item | Observation |
|---|---|
| Engine Start | Engine started without excessive cranking. |
| Exhaust & Cooling Water | Exhaust and cooling-water discharge appeared normal. |
| Gauges | Gauges held steady within specifications. |
| Oil Pressure & Temperature | Oil pressure and temperature readings matched ECU data. |
| Steering & Controls | Steering and control systems functioned flawlessly. |
| Transmission | Transmission shifted smoothly with no noise or leaks. |
| Backdown Test | Backdown test confirmed propeller thrust integrity. |
| Rudder Linkage | Rudder linkage tight and leak-free. |
| Leaks | No oil or coolant leaks detected. |
| WOT Test | At 2300 RPM, boost reached 37 PSI with clear exhaust and excellent combustion efficiency. |
Oil Analysis
Oil samples were submitted for spectrometric analysis to evaluate metal content, fuel dilution, and oxidation. Results showed low wear metals and no fuel contamination, confirming excellent internal condition and maintenance practices.
Findings
The Yanmar 4LHA-STP engine ran exceptionally smooth with no smoke or vibration irregularities. Oil pressure, boost, and temperature profiles remained within ideal operating parameters throughout the sea trial.
Visual inspection showed new hoses, belts, heat exchanger, and aftercooler, demonstrating consistent preventive maintenance. At 1,372 hours, wear is well within expected limits for this engine family. No evidence of overheating or fuel-system contamination was found.
With modern EFI tuning and high-efficiency cooling, the Yanmar 4LHA-STP is known for its balance of power and longevity in sport fishing and pleasure craft. The survey results support continued service without major repair, provided routine oil, filter, and coolant maintenance is kept on schedule.
Marine Engine Survey Summary
After completing the full inspection and sea trial, the professional assessment rates the engine as VERY GOOD. All systems tested within manufacturer tolerances and safety limits. No active fault codes or performance deficiencies were observed.
The engine room was exceptionally clean and organized, free of oil, grease, and corrosion. Electrical routing and hose support exceeded normal expectations and reflect consistent scheduled service and proper storage practices.
805 Marine Diesel Mechanic provides mobile marine diesel diagnostics, pre-purchase inspections, cooling-system service, fuel-system troubleshooting, oil analysis, and marine engine surveys throughout Ventura Harbor, Channel Islands Harbor, Oxnard, Channel Islands, and Santa Barbara.
Book Your Marine Engine Survey Today
Discuss your Yanmar 4LHA-STP marine engine or schedule a complete diesel engine inspection with 805 Marine Diesel Mechanic.
NOTICE:
The following statements limit the liability of the undersigned and set ethical standards associated with this report. Use of this report for any purpose constitutes acceptance of the following:
NOTE A:
This report is issued without prejudice and is the property of the Requestor as listed above. Any use or distribution by another party is prohibited and shall render this report invalid.
NOTE B:
This report is issued subject to the understanding that the undersigned surveyor is not responsible for error, omission, negligence, or misstatement. This report is a statement of opinion based on conditions observed at the time of inspection. It is not a warranty expressed or implied. This inspection is valid for the inspection date only as vessel conditions in a saltwater environment may deteriorate rapidly. Condition is regarded as good or better unless otherwise stated herein.
Survey Conducted By
Owner / Surveyor: Jeff Lendall
Jeff Lendall & Sons
805 Marine Diesel Mechanic