24 FT • Volvo Penta AD41P-A • Inboard / Outdrive Diesel Propulsion System
Marine Engine Survey
Conducted by: Jeff Lendall & Sons — 805 Marine Diesel Mechanic
This Volvo Penta AD41P-A marine engine survey documents engine condition, outdrive inspection findings, seawater cooling-system performance, turbocharger observations, WOT testing, drivetrain evaluation, oil-analysis findings, and maintenance recommendations for this 1998 SeaSport XL 2400.
Volvo Penta AD41P-A
DP-E Outdrive
Oil Analysis
Sea Trial
Vessel Identification
| Official Number | WMA24013J798 |
|---|---|
| LOA | 24 FT |
| Year | 1998 SeaSport XL 2400 |
ENGINE 1
Engine Make: Volvo Penta
Engine Model: AD41P-A
Engine Type: Inboard / Outdrive
Power HP: 200
Fuel Type: Diesel
Hours: 507
Serial Number: 452602
Transmission / Outdrive: Volvo Penta 3868224 DP-E
Serial Number: 4111578632
Engine Room Systems Inspection
Sea Trial Report
| Sea Trial Item | Observation |
|---|---|
| Engine Start | Engine started without excessive cranking. |
| Exhaust Appearance | Very minimal smoke observed for an engine of this age. |
| Cooling Water Exhaust | Cooling-water discharge appeared adequate and normal. |
| Engine Instruments | Engine instruments operated within normal limits at idle, cruising speed, and WOT. |
| Steering System | Steering system operated normally and was highly responsive. |
| Throttle & Shifter | Throttle and shifter operated normally with no adjustment needed. |
| Transmission Operation | Transmission shifted in and out of gear smoothly with no excessive noise. |
| Backdown Test | Backdown test satisfactory. |
Volvo Penta AD41P-A RPM Operating Guidelines
| Activity | RPM Range | Notes |
|---|---|---|
| Wide Open Throttle (WOT) | 3700–3900 RPM | Target range when properly propped and loaded with full fuel, water, and gear. |
| Rated Engine Speed | 3800 RPM | Specified speed at which engine produces maximum 200 HP output. |
| Cruising Speed | 3200–3600 RPM | General sustainable cruising speed recommendation. |
| Planning Speed | ~2600 RPM | Turbocharger and primary power delivery typically engage around this RPM. |
- Propeller Matching: Engine should achieve WOT range to prevent lugging or over-revving.
- Continuous Operation: Full power should be limited to approximately 1 hour per 12-hour operating cycle.
- Maintenance: Cooling system, aftercooler, and fuel-filter maintenance are critical for engine longevity.
- Documentation: Consult official Volvo Penta AD41P-A operator manual for installation-specific operating limits.
WOT Test Results:
Wide-open throttle testing confirmed excellent performance. No smoke was observed, the boat accelerated smoothly onto plane, and the engine delivered strong power throughout testing. WOT stabilized around 3500 RPM for approximately 3 minutes, slightly below rated 3800 RPM. Water temperature remained approximately 170°F and oil pressure remained approximately 90 PSI throughout the test, all within acceptable operating parameters.
Recommendations and Observations
- Saltwater cooling system should be descaled including heat exchanger, intercooler, lube oil cooler, and seawater pump. Replace zinc anodes throughout.
- Turbocharger has excessive shaft-bearing play and oil leakage and should be rebuilt.
- Cooling-system hoses and hose clamps show excessive wear and should be replaced.
- Drive belts worn and should be replaced.
- Oil leaking at head gasket or valve cover gasket area requiring repair.
- Seawater pump leaking at seals and should be replaced.
Oil Analysis Report
Volvo Penta Marine Engine AD41P-A
Volvo Penta AD41PA Coolant Sample
Possible Reasons for Oil in Coolant:
- Oil Cooler Failure: Most common cause on Volvo Penta 40-series engines.
- Gasket or Seal Failure: Possible leakage between oil and coolant passages.
- Head Gasket Leak: Less common but possible if overheating or coolant pressurization occurs.
- Sampling Contamination: Reservoir contamination or residue may affect sample results.
Master Marine Diesel Troubleshooting Guide – 805 Marine Diesel Mechanic
Marine Engine Survey Summary
As a result of my investigation,
MARINE ENGINE SURVEY
,
and by virtue of my experience, my opinion is OVERALL ENGINE RATING:
GOOD.
The engine room and engine appear to be generally well maintained overall.
Leaking Seawater Pump at Seals
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Ball Park Estimate of Repairs Needed
| Repair Item | Estimated Cost |
|---|---|
| Cooling-system hoses and hose clamps | $940 hoses + 5 hr labor |
| 24 stainless constant torque hose clamps | $336 |
| Drive belts | $64 + 1 hr labor |
| Head gasket or valve cover gaskets | $150–$220 + 3 hr labor |
| Turbocharger rebuild | $1600 + 2 hr labor |
| Seawater pump replacement | $420 + 1 hr labor |
| Descale saltwater cooling system | $89 + 4 hr labor |
Total Estimated Labor:
16 hours at $165/hr = $2640 labor
Estimated Parts:
Approximately $3669
Ball Park Estimate Total:
Approximately $6309 parts and labor
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
8 Responses