Part of the Yanmar Parts Manuals.
An engine comes off the stand faster than it goes back on, and the piece that stalls the job is never the big casting, it is the thrust bearing half or valve stem seal you cannot put a number on. This Yanmar parts catalog, publication YOOF2161, exists to name every one of those pieces for the 2TNV70-PTB from serial prefix E/#00155-, with the listing also covering the TB108, 4JH-DT, 4JH-DTZ, 4JH-DTZP, 4JH-DTZA, and 4JH-DTZY designations.
Across 40 pages of exploded figures it walks the complete engine: cylinder block, head and bonnet, crankshaft and pistons, camshaft and gears, injection pump, governor, injectors, fuel line, cooling and lube systems, starting motor, generator, and a full gasket set, with a numerical index to trace any part number back to its figure.
When there is no dealer counter nearby and nobody left to ask, this PDF downloads once and stays yours for the life of the engine.
What's Inside This Yanmar 2TNV70-PTB (TB108) Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 4-5 | Block Assembly, Plugs, Bolts, Main Bearing Set, Thrust Bearings |
| Gear Housing | 6-7 | Gear Case, Oil Seal, Relief Valve, Oil Pump Components, Bolts |
| Flywheel Housing & Oil Sump | 8-9 | Flywheel Housing, Oil Sump, Oil Seal, Bolts, Gaskets |
| Cylinder Head & Bonnet | 10-11 | Head Assembly, Valves, Valve Springs, Rocker Arm Assembly, Gaskets |
| Air Cleaner | 12-13 | Body, Element, Unloader Valve, Clamps |
| Exhaust Manifold & Silencer | 14-15 | Exhaust Manifold, Silencer, Gaskets, Bolts |
| Camshaft & Driving Gear | 16-17 | Camshaft Assembly, Tappets, Push Rods, Idle Gear, Pump Gear |
| Crankshaft & Piston | 18-19 | Crankshaft Assembly, Pistons, Piston Rings, Connecting Rods, Bearings |
| Lub. Oil System | 20-21 | Dipstick, Oil Filter, Oil Pipe, Oil Pressure Switch |
| Cooling Water System | 22-23 | Water Pump, Thermostat, Radiator, Fan, V-Belt |
| Fuel Injection Pump | 24-25 | Fie Assembly, Plunger, Delivery Valve, Control Rack, Governor Components |
| Governor | 26-27 | Case, Control Lever, Springs, Weights, Solenoid |
| Fuel Injection Valve | 28-29 | Injection Valve, Nozzle Holder, Fuel Pipes, Return Pipes |
| Fuel Line | 30-31 | Fuel Strainer, Fuel Filter, Water Separator, Fuel Pipes, Clamps |
| Starting Motor | 32-33 | Starter Assembly, Armature, Clutch, Solenoid Switch |
| Generator | 34-35 | Assembly, Stator, Pulley, Adjuster Belt |
| Gasket Set | 36-37 | Components, Cylinder Head Gasket, Oil Pump O-Rings, Valve Stem Seals |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Radiator Cap Pressure | 0.9 kg/cm² | p. 23 |
| Oil Pressure Switch Setting | 0.5 kg | p. 21 |
| Generator Output | 15A | p. 35 |
| Timer Setting | 1 sec | p. 35 |
| V-Belt Size | A35 | p. 23 |
Yanmar 2TNV70-PTB (TB108) Common Problems This Manual Covers
Hard starting from fuel delivery faults
A clogged strainer, a saturated water separator, or a cracked pipe letting air into the fuel line will keep this small diesel from firing. The Fuel Line figure identifies the strainer, filter, water separator, pipes, and clamps so you can order the whole run at once instead of chasing leaks part by part.
Manual Section: Fuel Line p. 30Worn injectors smoking or dribbling
Tired nozzles show up as smoke, rough combustion, and fuel odor long before a hard failure. The Fuel Injection Valve section breaks out the injection valve, nozzle holder, and the fuel and return pipes you disturb getting it out.
Manual Section: Fuel Injection Valve p. 28Surging or unstable engine speed
Hunting under load usually traces to the governor: fatigued springs, worn weights, or a sticking control lever. The Governor figure lists the case, levers, springs, weights, and solenoid by part number so you rebuild it with the right pieces the first time.
Manual Section: Governor p. 26Overheating and coolant loss
A weeping water pump, stuck thermostat, or glazed belt will push the temperature up under load. The Cooling Water System section covers the pump, thermostat, radiator, fan, and V-belt, and the catalog lists the belt as size A35 with a 0.9 kg/cm2 radiator cap.
Manual Section: Cooling Water System p. 22Low oil pressure warning at idle
Before condemning the bottom end, work through the lube circuit: filter, pipes, and the 0.5 kg oil pressure switch itself, which fails more often than the pump. The Lub. Oil System figure identifies every one of them, dipstick included.
Manual Section: Lub. Oil System p. 20Starter drags or fails to engage
A worn overrunning clutch or lazy solenoid switch is a common no-crank on these engines. The Starting Motor section shows the starter assembly broken down to armature, clutch, and solenoid so you can repair rather than replace the whole unit.
Manual Section: Starting Motor p. 32Bottom end wear at rebuild time
Once the crank is out and mics show the journals worn, you need exact numbers for main and rod bearings, piston rings, and connecting rod hardware. The Crankshaft & Piston figure lists the crankshaft assembly, pistons, rings, rods, and bearings for the ordering list.
Manual Section: Crankshaft & Piston p. 18Frequently Asked Questions
Which engines does this parts catalog cover?
It is Yanmar publication YOOF2161 for the 2TNV70-PTB engine from serial prefix E/#00155-, and the listing also names the TB108, 4JH-DT, 4JH-DTZ, 4JH-DTZP, 4JH-DTZA, and 4JH-DTZY designations. It is 40 pages, in English.
Is this a service manual with torque specs and clearances?
No. This is a parts catalog: exploded figures with reference numbers, part numbers, interchangeability marks, and effective serial ranges. It tells you exactly what to order once measurement shows a part is worn; the step-by-step procedures and clearances live in the separate service manual.
I only have a part number. Can I identify the part?
Yes. The Numerical Index on pages 38 to 40 cross-references every part number to its figure and item reference, so you can work backward from a number stamped on a tag or an old invoice to the exploded view it belongs to. p. 38
Does it list everything needed for a full reseal?
The Gasket Set section lists the set components, including the cylinder head gasket, oil pump O-rings, and valve stem seals, and each system figure (oil sump, exhaust manifold, cylinder head) shows its individual gaskets as well. p. 36
How will I receive this Yanmar 2TNV70-PTB & variants Parts Catalog?
Immediate download of the complete 40-page searchable Parts Catalog. Access it on any device, from a laptop at your desk to a phone in the field.
Can I print this manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
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