If you own this engine in your boat or other then this is for you:

Perkins Marine Engine Workshop Service / Repair Manual.

Manual in PDF format.

Covers diesel engines models 3.152, D3.152, 3.1522, 3.1524, T3.1524, D3.152M, 3HD46.

Sections include:

General Info
Engine Views
Tech Data
Maintenance
Fault Diagnosis
Cylinder Head
Pistons
Cylinder Block & Liners
Crankshaft
Timing Case
Lubrication System
Cooling System
Fuel System
Flywheel
Electrical System
Turbocharger
Marine Engines
Service Tools