Part of the Yanmar Repair Manuals.
An oil pressure warning at the helm gives you seconds to decide, and the right decision is written in one place. Yanmar publication 0ASYM-G00201 is the operation manual the factory issued for the 8SY-STP and the wider 8SY series of marine engines, delivered here as an 82 page PDF with 141 bookmarks so every section is a click away.
It walks you through daily checks, fuel, oil and coolant specifications, bleeding the fuel system, starting at low temperatures, the full periodic maintenance schedule, and preparation for long-term storage. When you are alone in the engine room with an alarm sounding and nobody left to call, this is the reference that tells you what the EMS S6 engine management system is reporting and what to do next.
Buy it once and it stays with the engine: keep the file on your phone, print the pages you will grease up at the bench, and stop guessing at intervals and capacities.
What's Inside This Yanmar 8SY-STP, 8SY Marine Engines, 8SY Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 11-18 | Safety Precautions (Before You Operate, During Operation and Maintenance), Safety Decals |
| Product Overview | 19-26 | Yanmar 8SY-Stp Features and Applications, Component Identification (Location of Nameplate, Engine Nameplate), Major Components |
| Before You Operate | 27-38 | Diesel Fuel (Specifications, Filling the Fuel Tank, Bleeding the Fuel System) |
| Engine Operation | 39-44 | Starting the Engine (Starting at Low Temperatures), Shutting Down the Engine, Checking the Engine After Operation |
| Periodic Maintenance | 45-72 | Safety Precautions |
| Long-Term Storage | 73-74 | Prepare Engine for Long-Term Storage |
| Specifications | 75-76 | Principal Engine Specifications |
| EPA Warranty Usa Only | 77-81 | Yanmar Co., Ltd. Limited Emission Control System Warranty - Usa Only, Your Warranty Rights and Obligations:, Warranty Period:, Warranty Coverage:, Exclusions: |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Exhaust/water mixing elbow cleaning interval | Every 250 hours or one year | p. 51 |
| Seawater pump impeller replacement interval | Every 250 hours or one year | p. 51 |
| Fuel filter element replacement interval (subsequent) | Every 250 hours or one year | p. 50 |
| Air intake filter element cleaning/replacement interval | Every 250 hours or one year | p. 51 |
| Air cleaner filter replacement condition | sooner than every 500 hours if the restriction indicator is red | p. 56 |
| Heat exchanger rear cover nuts torque | 92 N-m (19 ft-lb) | p. 66 |
| Engine Displacement | 15.6 L (952 cu in.) | p. 75 |
| Compression Ratio | 16:1 | p. 75 |
| Rated Output at Crankshaft | 662 kW at 2300 rpm (900 hp at 2300 rpm) | p. 75 |
| Low Idle Speed | 600 rpm | p. 75 |
| Battery Capacity - Recommended | 160 Ah | p. 75 |
| Coolant Capacity with Expansion Tank | 75 L (20 gal) | p. 75 |
Yanmar 8SY-STP, 8SY Marine Engines, 8SY Common Problems This Manual Covers
Seawater backflow through corroded mixing elbow
A corroded exhaust and water mixing elbow can let seawater work back toward the engine, and by the time compression suffers the damage is done. The manual schedules cleaning the exhaust and water mixing elbow every 250 hours or one year.
Manual Section: Periodic Maintenance p. 45Overheating from a worn seawater impeller
Rising coolant temperature under load often traces back to a tired impeller or a fouled seawater side. The maintenance schedule calls for checking or replacing the seawater pump impeller every 250 hours or one year.
Manual Section: Periodic Maintenance p. 45Hard starting after fuel filter service
Air pulled into the lines during a filter change will keep an 8SY cranking without firing. The bleeding procedure for the fuel system is laid out step by step in the Before You Operate section.
Manual Section: Before You Operate p. 27Coolant sludge from mixed antifreeze brands
Mixing different types or brands of LLC in the closed cooling circuit can form a harmful sludge. The manual sets the acceptable LLC concentration between 30 and 60 percent and spells out the water quality to use.
Manual Section: Before You Operate p. 27Alarms from the EMS S6 system
Oil pressure and coolant temperature warnings mean little until you know what the engine management system is watching and how the redundant throttle mode behaves. The Product Overview section explains what the EMS S6 monitors and how it responds.
Manual Section: Product Overview p. 19Power loss with restriction indicator red
A choked air cleaner starves the engine long before it fails outright. The manual says to replace the air cleaner filter sooner than every 500 hours if the restriction indicator is red, and notes the filter can only be cleaned a maximum of four times.
Manual Section: Periodic Maintenance p. 45Corrosion after a long seasonal layup
An engine that sits for months without preparation invites internal corrosion, especially in the raw water passages. The Long-Term Storage section covers preparing the engine before it goes idle.
Manual Section: Long-Term Storage p. 73Frequently Asked Questions
Which Yanmar engines does this manual cover?
It is Yanmar operation manual 0ASYM-G00201, written for the 8SY-STP and applicable to the 8SY series of marine engines. The Product Overview section shows where to find the engine nameplate so you can confirm your model, and the maintenance schedule is specific rather than generic - the seawater pump impeller replacement interval is on page 51.
What are the basic specifications of the 8SY-STP?
The Specifications section lists a displacement of 15.6 L (952 cu in.), a 16:1 compression ratio, rated output at the crankshaft of 662 kW (900 hp) at 2300 rpm, low idle of 600 rpm, and capacities such as 75 L (20 gal) of coolant with the expansion tank. p. 75
Does it explain how to bleed the fuel system?
Yes. Bleeding the Fuel System is covered in the Before You Operate section, alongside diesel fuel specifications (a minimum cetane number of 45), filling the fuel tank, and the recommended SAE 15W40 engine oil viscosity. p. 27
What maintenance intervals does the manual give?
The Periodic Maintenance section carries the full schedule. Fuel filter elements, the seawater pump impeller, the air intake filter element, and the exhaust and water mixing elbow all come due every 250 hours or one year. p. 45
Is this Yanmar 8SY-STP Operation Manual a digital download?
Instant PDF download (4 MB). You get the full 82-page searchable Operation Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Are there any print restrictions on this manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
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