All 44 pages of this Yanmar TL120 / 4TNV84T-XTBL parts catalog PDF organize the complete turbocharged engine into exploded-view assemblies, from cylinder block through gasket set, each carrying factory part numbers and cross-references for every listed component. Inside: fuel injection pump, governor, crankshaft and piston, lubrication oil circuit, cooling water system, starting motor, generator, and the RHF4 turbine assembly. Part callouts are indexed against original Yanmar component numbers, so you can identify the exact piece before you pick up the phone. The piston pin specs at D26 x L70 mm; the oil sump uses an M22 drain plug. Chasing a part number off a worn tag costs time you don't have. Bookmarked by assembly, keyword-searchable end to end; open it on your tablet, find the part, and place the order.
What's Inside This Yanmar TL120, 4TNV84T-XTBL Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 5-6 | Cylinder Block Assy, Camshaft Bush, Main Bearing Set, Thrust Bearing Assy, Head Gasket, Spacer, Thrust .250S Bearing |
| Gear Housing | 7-8 | Gear Case Assy, Oil Seal, Pump Cover Assy, Lub. Oil Pump Cover, Relief Valve, Spring, Gear Case Flange, Filler Cover |
| Flywheel Housing & Oil Sump | 9-10 | Flywheel Housing, Flywheel Cover Cap, Oil Sump Spacer, Lub. Oil Sump Assy, Oil Seal Case Assy, Oil Seal, Gasket.liquid |
| Cylinder Head & Bonnet | 11-12 | Engine Lifter, Valve Bridge Seat a, Cylinder Hed Assy, Valve Guide, Valve Bridge Guide, Exhaust Valve, Valve Spring, Spring Retainer |
| Suction Manifold & Air Cleaner | 13-14 | Intake Hose, Intake Manifold, Mafifold Gasket, Air Heater, Gasket, Air Cleaner, Inner Element Assy, Element |
| Exhaust Manifold & Silencer | 15-16 | Exhaust Manifold Gasket, Exhaust Manifold, Muffler, Silencer Support, Turbocharger Gasket |
| Camshaft & Driving Gear | 17-18 | Tappet, Push Rod, Camshaft Assy, Thrust Metal, Camshaft Gear, Idle Gear Shaft, Idle Gear Assy, Idle Gear Bush |
| Turbine | 19-20 | Gasket, RHF4 Turbine, Bolt, Nut |
| Crankshaft & Piston | 21-22 | Crankshaft Assy, Crankshaft Gear, Crankshaft V-Pulley, Flywheel Assy, Ring Gear, Piston Assy, Ring Set, Connecting Rod Assy |
| Lub.Oil System | 23-24 | Lub. Oil Dipstick, Dipstick Guide, Gasket, Lub. Oil Pipe Assy, Oil Cooler Assy, Bracket Assy, Joint, Cooler in Pipe Assy |
| Lub.Oil Line | 25-26 | Joint Bolt Assy, Round Gasket, Fuel Return Pipe, Hose, Elbow, Lub. Oil Pipe Assy, Retainer |
| Cooling Water System | 27-28 | Cooling Water Pump Assy, Gasket, Plate, Joint, Thermo. Case Gasket, V-Pulley, V-Belt A36, Cooling Fan |
| Fuel Injection Pump | 29-30 | Fuel Injection Pump Assy, Joint, Stopper, Dilevery Valve Assy, Spring, Delivery Holder, Cooling Water Joint, Lifter |
| Governor | 31-32 | Case Cover, Case Packing, Spring, Regulator Lever, Shaft Retainer, Stop Solenoid |
| Fuel Injection Valve | 33-34 | Fuel Injector, Nozzle Assy, Nozzle Holder Assy, Nozzle Spring, Nozzle Spring Seat, Stop Plate, Retainer, Injection Pipe Assy |
| Fuel Line | 35-36 | Fuel Filter Bracket, Foﾌｲﾙﾀ, Fuel Pipe Assy, Tube, Fuel Oil Pipe, Fuel Pump, Separator Assy, Retaining Ring |
| Starting Motor | 37-38 | Starter, Pinion Shaft, Armature Assy, Field Coil Assy, Brush, Rear Cover, Brash Holder Assy, Brush Spring |
| Generator | 39-40 | Belt Adjuster, Alternator, Rotor Assy, Bearing Cover, Drive Flame Assy, Plate, Rear Flame Assy, Pulley |
| Gasket Set | 41 | Head Gasket, Valve Stem Seal, Nozzle Protector, Nozzle Seat, Bonnet Pk, Exhaust Manifold Gasket, Turbocharger Gasket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main Bearing Undersize | 0.25 | p. 5 |
| Drain Plug Size | M22 | p. 9 |
| Piston Pin Diameter and Length | D26, L70 mm | p. 21 |
| Piston Ring Oversize | 0.25 | p. 21 |
Yanmar TL120, 4TNV84T-XTBL Common Problems This Manual Covers
Yanmar TL120 fuel filter part number unclear , need to match correct replacement for fuel line assembly p. 35
Check the Fuel Line exploded view on page 35. The fuel filter is listed under the Bracket, Fuel Filter group alongside the Separator Assy and Fuel Pump parts. Cross-reference the part number in the index to confirm it matches your serial number range before ordering. Also verify the fuel-water separator part number on the same page, as both are commonly replaced together.
Manual Section: Fuel LineGlow plug or intake heater part number needed for cold-start no-start diagnosis p. 13
Locate the Suction Manifold and Air Cleaner section on page 13. The intake air heater (Heater, Air) is listed alongside the intake manifold gasket and manifold parts. Identify the correct heater part number from the parts list before ordering, and confirm the gasket part number on the same page if the manifold is removed during service.
Manual Section: Suction Manifold & Air CleanerWater pump assembly part number needed , cooling system leak around pump housing p. 27
Open the Cooling Water System parts list on page 27. The C.W. Pump Assy is listed with associated components including V-Pulley, V-Belt, Fan, Thermostat, and coolant switch. Order the complete pump assembly part number from that list; also note the thermostat part number on the same page since both are frequently replaced together during cooling system work.
Manual Section: Cooling Water SystemFuel injector nozzle part number for rough-running or white-smoke diagnosis on this engine p. 33
Reference the Fuel Injection Valve section on page 33. The Nozzle Assy, Holder Assy, and Nozzle Spring are listed individually. Identify whether you need the complete injector assembly or just the nozzle tip, then cross-check the part numbers against the injection pipe assembly (Pipe Assy, Injection) listed on the same page to ensure full system compatibility.
Manual Section: Fuel Injection ValveOil filter and oil cooler part numbers needed after lubrication failure or oil change service p. 23
Check the Lub. Oil System parts list on page 23. The Filter 80X80L and Cooler Assy, Oil are both listed there along with the dipstick, oil cooler inlet pipe, and oil pressure switch. Confirm the filter part number before purchasing , aftermarket filters vary in thread and bypass spec. Note the drain plug size is M22 (page 9) if you also need a replacement drain plug or sealing washer.
Manual Section: Lub.Oil SystemPiston ring or connecting rod bearing part numbers needed for crankshaft and piston overhaul p. 21
Open the Crankshaft and Piston section on page 21. Ring Set and Metal Assy (Crankpin) are listed there, with piston ring oversize available at 0.25 mm. The piston pin is listed as D26, L70 mm , confirm that dimension matches your parts order. Also check page 5 for the main bearing set, which lists a 0.25 mm undersize option for crankshaft journals.
Manual Section: Crankshaft & PistonFrequently Asked Questions
What are the replacement specifications for fuel filters?
The manual lists the fuel filter as part number 119802-55801, described as "F0フイルタ" (Fuel Filter). For replacement, the SEPARATOR ASSY is part number 129906-55700 and the ELEMENT is part number 119802-55710. These part numbers serve as the replacement specifications within this parts catalog.
What are the replacement specifications for air filter?
The manual lists the air cleaner as part number 129953-12530, described as "CLEANER, AIR". For replacement, the inner element is part number 119005-12571 ("ELEMENT ASSY, INNER") and the main element is part number 129062-12560 ("ELEMENT"). These part numbers serve as the replacement specifications within this parts catalog.
How do you fix yanmar TL120 fuel filter part number unclear , need to match correct replacement for fuel line assembly?
Check the Fuel Line exploded view on page 35. The fuel filter is listed under the Bracket, Fuel Filter group alongside the Separator Assy and Fuel Pump parts. Cross-reference the part number in the index to confirm it matches your serial number range before ordering. Also verify the fuel-water separator part number on the same page, as both are commonly replaced together.
How do you fix glow plug or intake heater part number needed for cold-start no-start diagnosis?
Locate the Suction Manifold and Air Cleaner section on page 13. The intake air heater (Heater, Air) is listed alongside the intake manifold gasket and manifold parts. Identify the correct heater part number from the parts list before ordering, and confirm the gasket part number on the same page if the manifold is removed during service.
How will I receive this Yanmar TL120, 4TNV84T-XTBL Parts Catalog?
You get a 44-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Can I print this manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Document Quality
This document is a scanned copy of a physical parts catalog. An OCR layer has been applied, so you can search and copy text throughout the document, though the text itself is not natively digital crisp. Diagrams and illustrations are raster images, but they are generally clear, and their labels are readable. The pages are clean with no significant scan artifacts, stains, or skewed content. There is one mostly blank filler page present at the beginning of the document.
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