Part of the Yanmar Repair Manuals.
Valve lash on the 6LP-DTE series runs 0.15 to 0.25 mm on the intake side, while the STE series calls for 0.17 to 0.23, and guessing between the two is how a fresh head job goes wrong. This is Yanmar's own service manual, publication HINSHI-H10-001-2, for the 6LP-DTE, 6LP-DTZE(1), 6LPA-DTP, 6LPA-DTZP, 6LP-STE, 6LP-STZE(1), 6LPA-STP, and 6LPA-STZP marine diesel engines.
The heart of the book is the Engine Overhaul section, pages 44 to 219: cylinder head, cylinder block, timing belt and timing gear, valve clearance inspection and adjustment, and injection timing. Around it sit specifications, piping diagrams, performance curves, symptom-based troubleshooting, wiring diagrams for the optional instrument panels, and a special tools list.
It downloads as a 247 page PDF, so the clearances and torque sequences are on hand at the bench or aboard, wherever the engine happens to be apart.
What's Inside This Yanmar 6LP / 6LPA Series Manual
| System | Pages | Key Topics |
|---|---|---|
| For Safe Operation | 20-25 | Warning Symbols, Precautions for Safe Servicing, Product Safety Label Locations |
| General | 26-43 | Specifications, External Views, Piping Diagram, Performance Curves, Front PTO Output, Fuel Oil, Lube Oil, Cooling Water, Senders and Warning Switches |
| Cylinder Head & Cylinder Block | 44-90 | Cylinder Head, Cylinder Block, Disassembly, Inspection, Reassembly |
| Timing Gear & Valve Train | 91-118 | Timing Belt, Timing Gear, Valve Clearance Inspection and Adjustment, Injection Timing Adjustment, Service Specifications |
| Turbocharger | 119-140 | Turbine, Blower, Bearing, Seal Ring, Turbine Shaft, Thrust Bushing, Oil Thrower, Floating Bearing |
| Fuel System | 141-171 | Fuel Filter Replacement, Fuel Injection Nozzle, Fuel Injection Pump, Fuel System Service Specifications |
| Cooling System | 172-180 | Fresh Water Pump, Sea Water Pump, Thermostat, Cooling System Components |
| Lubrication System | 181-194 | Lubrication, Oil Pump, Oil Cooler, Piston Cooling Oil Nozzle, Service Specifications |
| Starter & Charging System | 195-219 | Starter, Charging System, Crankshaft Bearing Selecting Table |
| Troubleshooting | 220-228 | Hard Starting, Unsmooth Running, Sudden Engine Stop, Poor Exhaust Gas Color, Insufficient Output, Knocking, Turbocharger Trouble |
| Instrument Panel (Optional) | 229-231 | B-Type Panel, C-Type Panel, D-Type Panel |
| Electric Wiring Diagram | 232-234 | Engine Harness, Starter Switch, Air Heater and Controller, Battery, Starter, Alternator, Tacho Sensor |
| Tools | 235-245 | Special Tools, Recommended Tools, Equipment, Service Special Materials |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Fuel filter tightening torque | 150 to 200 kgf·cm (14.71 to 19.61 N·m) | p. 142 |
| Thermostat valve opening temperature | 68 to 72 °C | p. 177 |
| Thermostat valve lift | 10 mm or more at 90 °C | p. 177 |
| Oil cooler to oil cooler cover tightening torque | 160 kgf·cm (15.69 N·m) | p. 190 |
| Oil cooler and cover assembly tightening torque | 200 kgf·cm (19.61 N·m) | p. 190 |
| Engine Displacement | 4.163 L | p. 26 |
| Number of Cylinders | 6 | p. 1 |
| Fuel Injection Timing | FID 13.5 ±1 BTDC | p. 114 |
| Low Idling Speed | 700±25 rpm | p. 114 |
| Head Bolt Thread Diameter (Standard) | 10.800 to 11.000 mm | p. 116 |
| 6LP-DTE series | ||
| Valve Clearance (Intake), 6LP-DTE series | 0.15 to 0.25 mm | p. 114 |
| 6LP-STE series | ||
| Valve Clearance (Intake), 6LP-STE series | 0.17 to 0.23 mm | p. 114 |
Yanmar 6LP / 6LPA Series Common Problems This Manual Covers
Cranks but will not start
The classic 6LP complaint after a season of sitting: air gets into the fuel or the filter clogs, and the engine spins without firing. Section 4.1 works the symptom through the likely causes in order before you start pulling lines.
Manual Section: 4. Troubleshooting p. 220Overheating and temperature alarms
A lazy thermostat or a fouled cooling circuit sends the temperature climbing under load. The manual gives the thermostat test figures, valve opening at 68 to 72 degrees C and 10 mm or more of lift at 90 degrees, so you condemn the part with numbers rather than a guess.
Manual Section: 3. Engine Overhaul p. 44Valve clearance drifts out of spec
Lash opens up over the hours, the top end gets noisy, and performance follows. The overhaul section covers valve clearance inspection and adjustment, with separate intake figures for the DTE and STE series.
Manual Section: 3. Engine Overhaul p. 44Smoke and hard starting after pump work
Injection timing set by eye shows up as poor exhaust color and reluctant starts. Section 3.6 covers inspection and adjustment of injection timing; the factory reference is FID 13.5 ±1 degrees BTDC.
Manual Section: 3. Engine Overhaul p. 44Loses power under load
Insufficient output usually traces back to restricted fuel flow, a tired injector, or an intake or exhaust restriction. Section 4.5 gives the diagnostic sequence so you chase the cause instead of the symptom.
Manual Section: 4. Troubleshooting p. 220Dead gauges or stuck alarms
Instrument panel trouble is a wiring fault more often than a sender fault. The wiring diagram section maps the circuits for the B-type and C/D-type panels so you can trace them with a meter.
Manual Section: 6. Electric Wiring Diagram p. 232Frequently Asked Questions
Which Yanmar engines does this service manual cover?
All eight 6LP and 6LPA marine diesel variants: 6LP-DTE, 6LP-DTZE(1), 6LPA-DTP, 6LPA-DTZP, 6LP-STE, 6LP-STZE(1), 6LPA-STP, and 6LPA-STZP. The General section carries the specifications for these six cylinder engines, plus external views, piping diagrams, and performance curves. p. 26
Does it include valve clearance and injection timing specs?
Yes. The Engine Overhaul section covers valve clearance inspection and adjustment, 0.15 to 0.25 mm intake on the DTE series and 0.17 to 0.23 mm on the STE series, along with inspection and adjustment of injection timing. p. 44
Are wiring diagrams included?
Yes. The Electric Wiring Diagram section covers the B-type instrument panel and the C/D-type panels, and a separate section covers the optional instrument panel itself. p. 232
How do I get the manual after purchase?
It is a direct PDF download available immediately after checkout. Save it to a laptop, tablet, or phone; it opens in any PDF reader with no special software or activation, so the specs travel with you wherever the engine is.
Is this Service Manual a digital download?
A 247-page Service Manual in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Are there any print restrictions on this manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Are electrical wiring diagrams included in this Yanmar 6LP-DTE & variants?
Yes. The Electric Wiring Diagram section at p232-234 carries the electrical wiring diagrams for this machine.
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