Part of the Yanmar Parts Manuals.
An engine apart on the stand with a worn crank leaves you one question: standard or 0.25 undersize. This Yanmar TNV series parts catalog answers it in part numbers, listing the 0.25 undersize main metal and 0.25 oversize piston rings alongside the standard fits, so the machine shop's grind and your parts order agree before anything goes back together.
It covers the 3TNV70-GGE, 3TNV70-ASA and 3TNV70-HGE, plus the 3TNV76-GGE, 3TNV76-CSA and 3TNV76-HGE, across 31 pages of exploded views: cylinder block, gear housing, camshaft, crankshaft and piston, lubrication and cooling, fuel injection pump and governor, injectors, fuel line, starting motor, generator, and the complete gasket set.
A guessed part number wastes as much money as a guessed torque figure, just more slowly. Download the PDF, jump by bookmark to the system you have in pieces, and order the right piece the first time.
What's Inside This Yanmar Yanmar 3TNV70-3TNV76 Series Parts Manual
| System | Pages |
|---|---|
| Cylinder Block | 3 |
| Gear Housing | 4 |
| Flywheel Housing & Oil Sump | 5 |
| Cylinder Head & Bonnet | 6 |
| Air Cleaner | 7 |
| Exhaust Manifold & Silencer | 8 |
| Camshaft & Driving Gear | 9 |
| Crankshaft & Piston | 10 |
| Lub.Oil System | 11 |
| Cooling Water System | 12 |
| Fuel Injection Pump | 13-19 |
| Governor | 15 |
| Fuel Injection Valve | 20 |
| Fuel Line | 21 |
| Starting Motor | 22 |
| Generator | 23 |
| Gasket Set | 24 |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| 3TNV76-NBK, 3TNV76-GGE, 3TNV76-HGE | ||
| THERMOSTAT operating temperature | 71C | p. 12 |
| THERMO SWITCH activation temperature | 110 C | p. 12 |
| Main Metal Under-size | 0.25 | p. 3 |
| Piston Ring Over-size | 0.25 OS | p. 10 |
| Oil Pressure Switch Setting | 0.5KG | p. 11 |
| Thermostat Switch Temperature | 110 C | p. 12 |
| Governor Link Length | L=29.3 | p. 15 |
| Governor Shim Thickness | T=0.6 | p. 15 |
| Timer Duration | 3SEC | p. 23 |
| 3TNV70-GGE, 3TNV70-ASA, 3TNV70-HGE | ||
| Cooling Fan Diameter | 310 | p. 30 |
| 3TNV70-GGE, 3TNV70-ASA, 3TNV70-HGE, 3TNV76-GGE, 3TNV76-CSA, 3TNV76-HGE | ||
| Extension Cord Length | 2M | p. 31 |
Yanmar Yanmar 3TNV70-3TNV76 Series Common Problems This Manual Covers
Crank journals worn past standard clearance
After a regrind the bearings must match the cut, and a mismatched shell destroys a fresh journal fast. The Cylinder Block pages list the 0.25 undersize main metal by part number for the 3TNV76 builds, so your order matches the machine shop's work.
Manual Section: Cylinder Block p. 3Low compression from a worn bore
Blow-by and weak compression on a high-hour engine usually end at the bore. The Crankshaft & Piston section lists 0.25 oversize piston rings alongside the standard set, so a rebore does not stall waiting on the right ring pack.
Manual Section: Crankshaft & Piston p. 10Oil pressure lost despite oil in sump
TNV owners have lost engines with oil still in the sump when the lubrication system quit. The Lub.Oil System section identifies the oil pump and the 0.5 kg oil pressure switch by part number, so a suspect sender or pump gets replaced, not second-guessed.
Manual Section: Lub.Oil System p. 11Overheating from thermostat or switch failure
A diesel run hot under load rarely forgives it. The Cooling Water System section covers the 71 C thermostat and the 110 C thermo switch, the two parts to renew before an overheat turns into a head job.
Manual Section: Cooling Water System p. 12Hunting and surging at steady load
An engine that hunts at a fixed throttle setting often has slop in the governor linkage. The Governor pages list the link (L=29.3) and shim (T=0.6) individually, so you can renew the worn pieces instead of buying a complete pump.
Manual Section: Governor p. 15Air in the fuel, hard starting
Cracked pipes and loose joints let air into the fuel, and the engine stumbles or refuses to fire. The Fuel Line section shows each pipe and fitting with its own part number, so you replace the one leaking piece rather than guessing at the whole run.
Manual Section: Fuel Line p. 21Starter drags or will not engage
A starter that labors on a cold morning is usually the first electric part to give up on a small diesel. The Starting Motor section pins down the correct unit for your engine variant, so you order the right motor the first time instead of matching off a corroded tag.
Manual Section: Starting Motor p. 22Frequently Asked Questions
Which Yanmar engines does this parts catalog cover?
It covers the Yanmar TNV series small diesels 3TNV70-GGE, 3TNV70-ASA, 3TNV70-HGE, 3TNV76-GGE, 3TNV76-CSA and 3TNV76-HGE. The part tables carry quantity columns for the different variants, so you can confirm which components apply to your exact build before ordering.
Does it list undersize bearings and oversize rings for a rebuild?
Yes. The Crankshaft & Piston section lists 0.25 oversize piston rings, and the Cylinder Block section lists 0.25 undersize main metal, each with its own Yanmar part number, so you can order to match a rebore or crank regrind. p. 10
Does it cover the fuel injection pump and governor?
Yes. The Fuel Injection Pump section runs from page 13 to 19 and includes the governor components down to the individual link and shims, so you can order single wear parts instead of a complete pump assembly. p. 13
Is this a service manual with torque specs and clearances?
No. It is a factory parts catalog: exploded views, part numbers and quantities, not repair procedures. Torque figures and clearances belong in the TNV service manual; use this catalog alongside it to identify and order the parts your measurements condemn.
How will I receive this Yanmar 3TNV76-GGE & variants Parts Catalog?
A 31-page Parts Catalog in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Am I able to print pages from this manual?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
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