Twin Detroit Diesel 6V92T • Allison M30 Marine Transmissions
Marine Engine Survey
Conducted by: Jeff Lendall & Sons — 805 Marine Diesel Mechanic
Comprehensive marine engine survey performed on twin Detroit Diesel 6V92T marine propulsion engines, Detroit Allison M30 marine transmissions, cooling systems, fuel systems, shaft systems, exhaust systems, and operational sea-trial performance aboard this 43FT Bertram sportfish vessel.
Detroit Diesel 6V92T
Allison M30
Sea Trial
Oil Analysis
ENGINE 1 — PORT
Engine Make: Detroit Diesel
Engine Model: 6V92T
Engine Type: Inboard
Power HP: 435
Fuel Type: Diesel
Hours: Approximately 1014 (hour meter inoperative)
Serial Number: 6VA365969
Engine Location: Port
Transmission Port: Detroit Allison Marine Transmission M30
ENGINE 2 — STARBOARD
Engine Make: Detroit Diesel
Engine Model: 6V92T
Engine Type: Inboard
Power HP: 435
Fuel Type: Diesel
Hours: Approximately 4442 (hour meter inoperative)
Serial Number: 6V370182
Engine Location: Starboard
Transmission Starboard: Detroit Allison Marine Transmission M30
Engine Room Systems Inspection
Sea Trial Report
| Sea Trial Item | Observation |
|---|---|
| Engine Starting | Engines started without excessive cranking. |
| Exhaust Appearance | Minimal smoke observed considering engine age. |
| Cooling Water Exhaust | Cooling-water discharge appeared adequate and normal. |
| Instrumentation | Engine instrumentation operated normally except inoperative port tachometer and missing alarm systems. |
| Steering System | Steering system operated smoothly and responsively. |
| Throttle Operation | Throttle response appeared normal. |
| Transmission Operation | Both Allison transmissions shifted smoothly with no excessive noise. |
| Backdown Test | Backdown test satisfactory. |
| Rudder Linkage | Rudder linkage operated properly underway with no leaks observed. |
Wide Open Throttle Test (WOT):
Both Detroit Diesel 6V92T engines operated smoothly with approximately 50 PSI oil pressure and minimal smoke output. Water temperature increased quickly toward 200°F indicating overdue saltwater cooling-system service. Drivetrain vibration remained within acceptable operating range.
Oil Analysis
Marine Engine Survey Summary
As a result of this marine engine survey, operational sea-trial testing, drivetrain inspection, and by virtue of experience, the overall propulsion package appears generally well maintained for age. Several critical cooling-system and safety-related repairs are strongly recommended before extended operation.
OVERALL ENGINE RATING: GOOD
Master Marine Diesel Troubleshooting Guide – 805 Marine Diesel Mechanic
Results, Recommendations & Estimated Repair Costs
| Repair Recommendation | Estimated Cost |
|---|---|
| Replace cooling-system hoses, hose clamps, and selected fuel/oil hoses | $1,600 parts + 21 labor hours |
| Replace 4-inch seachest and sea-strainer hoses | $600 parts + 4 labor hours |
| Reconnect and repair alarm systems | $1,200–$1,700 |
| Repair leaking port expansion tank | $300 |
| Replace crankcase breather hoses and filters | $450 |
| Replace seawater pumps (2) | $2,000 + 4 labor hours |
| Replace coolant with SCA charged antifreeze | $360 |
| Complete saltwater-system descaling service including coolers and heat exchangers | $500 parts + 24 labor hours |
Estimated Materials: $7,510
Labor: 53 Hours @ $175/hr = $9,275
Estimated Total: $16,785
Fuel Hose Leak
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
2 Responses