Premium Marine Engine Survey Report

47FT BUDDY DAVIS SPORT FISHER

1991 • 47 FT • Official #949819 • Twin Detroit Diesel 8V92TI Marine Diesel Engines

Marine Engine Survey

Conducted by: Jeff Lendall & Sons — 805 Marine Diesel Mechanic

This Detroit Diesel 8V92TI marine engine survey documents propulsion-system condition, Twin Disc marine transmission findings, cooling-system inspection, turbocharger observations, drivetrain condition, oil leak findings, sea trial performance, and overall machinery condition aboard this 47FT Buddy Davis sport fisher.

Detroit Diesel 8V92TI
Twin Disc MG5114SC
Sea Trial
Oil Analysis

Vessel Identification

HIN / IMO	DYW47179F091
Official Number	949819
LOA	47 FT
Year	1991

ENGINE 1 — PORT

Engine Make: Detroit Diesel
Engine Model: 8V92TI
Engine Type: Inboard
Power HP: 735
Fuel Type: Diesel
Hours: Rebuilt at 1399-4668 = actual 3269
Serial Number: 8VA365969
Engine Location: Port

Transmission Port: Twin Disc MG5114SC Marine Transmission

ENGINE 2 — STARBOARD

Engine Make: Detroit Diesel
Engine Model: 8V92TI
Engine Type: Inboard
Power HP: 735
Fuel Type: Diesel
Hours: Rebuilt at 1413-4669 = actual 3256
Serial Number: 8VA370182
Engine Location: Starboard

Transmission Starboard: Twin Disc MG5114SC Marine Transmission

Twin Detroit Diesel 8V92TI propulsion system inspection during marine engine survey.

Engine Room Systems Inspection

Fuel Filtration System: Racor Twin Turbine Series fuel filter/water separator 10 micron port and starboard assemblies appeared serviceable. No water present. Electric priming pumps and vacuum gauges installed.

Throttle & Shifter Controls: Panish Morse cable controls operated properly at flybridge.

Seawater Pumps: Seals not leaking. No water present. Adequate pressure observed.

Tube-Type Heat Exchanger: Inlet and outlet temperatures checked and remained within parameters.

Engine Oil Cooler: Inlet and outlet temperatures checked and remained within parameters.

Engine Mounted Fuel Cooler: Temperature differential appeared within normal operating parameters.

Seawater Pump Outlet Pressure: Adequate pressure observed.

Coolant Level Sensor: Working properly. No leaks observed.

Engine Mounts and Bed: Main engine beds are heavy longitudinal stringers inboard and outboard. Engine mounts satisfactory.

Lubrication: Oil level indication normal both port and starboard.

Lube Oil Pressure: WOT engine load approximately 75 PSI starboard. Port side oil pressure gauge at flybridge inoperable.

Cooling System Type: Freshwater reservoir type cooling with seawater cooled wet exhaust operated satisfactorily.

Coolant Level: Normal coolant levels observed. Expansion tanks pressure tested to 25 PSI with no noticeable pressure drop. Infrared heat gun testing showed normal cooling-system temperatures.

Hoses and Clamps: Double clamped where sighted. Quality 304 stainless steel hose clamps installed.

Belts and Pulleys: Condition appeared serviceable.

Seacocks and Strainers: Ball-valve seawater seacocks operated smoothly and satisfactorily.

Exhaust System: Seawater cooled with risers and flexible coupling sections. New hoses and double clamped where sighted.

Engine Alarms: Port and starboard low oil pressure alarms and coolant overheat warnings audible at helm station.

Engine Shutdown: Electronic shut-off solenoid systems operated satisfactorily.

Dripless Shaft Seals: Working properly with no leaks detected.

Engine Alignment: Appeared smooth and without vibration.

Rudders: Packing-gland style rudders appeared serviceable with no excessive leakage or vibration.

Turbochargers: Appear rebuilt or recently serviced. Turbochargers spooled smoothly around 1200 RPM and operated satisfactorily.

Twin Disc Transmissions: Both shifted smoothly with no excessive noise or vibration. Port side leaking small amount at engine pump.

Sea Trial Report

Sea Trial Item	Observation
Cold Start	Engines started without excessive cranking.
Exhaust Appearance	Very minimal smoke observed for engines of this age and horsepower.
Cooling Water Discharge	Cooling-water discharge appeared strong and normal.
Instrumentation	Engine instrumentation operated within normal limits except port oil pressure gauge at flybridge was inoperable.
Steering System	Steering system operated normally and was highly responsive.
Throttle Operation	Throttle controls operated normally.
Transmission Operation	Both transmissions shifted smoothly in and out of gear with no excessive noise.
Backdown Test	Backdown test satisfactory.
Rudder Linkage	Rudder linkage operated smoothly with no leaks detected.
Oil Leaks	Oil leaks detected at port transmission, starboard governor, and both valve covers.

WOT TEST: In 1982 the US Navy sent Jeff Lendall to Diesel Mechanic School focused heavily on Detroit Diesel engines. In over 40 years of experience, this pair of 8V92TI engines produced exceptionally low smoke output. Engines accelerated quickly to approximately 2150 RPM and the vessel operated extremely smoothly at approximately 25 knots.

Oil Analysis Samples

Component	Oil Analysis Link
Detroit Diesel 8V92TI Port Engine	Detroit Diesel 8V92TI Port Engine
Detroit Diesel 8V92TI Starboard Engine	Detroit Diesel 8V92TI Starboard Engine
Port Transmission	Marine Gear Port
Starboard Transmission	Marine Gear Starboard

Results & Recommendations

Some cooling-system hoses, air breather hoses, and oil hoses should be replaced.
Oil leaks present at port transmission pump, valve covers, and oil pan.
AIR-SEP air filters and oil breathers require replacement.
Port side oil pressure gauge at flybridge should be replaced.
Due for oil and filter service on both engines and transmissions.

Heat exchanger cooling-system hose showing deterioration and replacement need.

Detroit Diesel 8V92TI cooling-system hoses requiring future maintenance replacement.

Detroit Diesel 8V92TI Fuel Consumption Planning

Assumptions: Twin engines, heavy offshore load conditions.

Typical Fuel Burn: Approximately 25–30 GPH per engine (50–60 GPH combined).

Speed	Run Time	Total Fuel Burn	+20% Reserve	+30% Reserve
18 knots	11.1 hrs	555–665 gal	665–800 gal	720–865 gal
20 knots	10 hrs	500–600 gal	600–720 gal	650–780 gal
22 knots	9.1 hrs	455–545 gal	545–655 gal	590–710 gal

Best Real-World Planning Number:
Approximately 20 knots with around 700 gallons onboard for reserve and weather safety margin.

Long-Range Offshore Fuel Planning

The approximate distance between Ensenada, B.C.N., Mexico and Bahia Tortuga, B.C.S., Mexico is approximately 524–529 miles depending on route selection.

Expected Total Fuel Burn:
Approximately 1,300–1,600 gallons combined for both engines under heavy offshore load conditions.

Recommended Real-World Planning Fuel Capacity:
Approximately 1,700–1,900 gallons onboard including reserve fuel margin.

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 engines appear to be well maintained overall.

Master Marine Diesel Troubleshooting Guide – 805 Marine Diesel Mechanic