All 42 pages of this Yanmar 4TNV88-QTBC Parts Catalog cover a single engine: the diesel unit fitted to the TB145 compact excavator. Inside, you get factory exploded views paired with full part numbers for every engine system, cylinder block through crankshaft, fuel injection pump, governor, injector, and complete gasket set. Each assembly is indexed and cross-referenced so you can identify the exact component before you pick up the phone. Need oversize piston rings? The catalog specifies the 0.25mm oversize dimension; the oil pressure switch is rated at exactly 0.5KG activation pressure. No more squinting at worn castings trying to guess what you need. Bookmarked and keyword-searchable, this PDF lets you jump straight to any assembly on your laptop, tablet, or phone and get the right Yanmar part number on the first call.
What's Inside This Yanmar 4TNV88-QTBC, TB145 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 6-7 | Cylinder Block Assy, Camshaft Bush, Main Bearing Set Repair Part, Thrust Metal, Cylinder Head Gasket, Spacer, Main Metal Under-Sized Part, Thrust. Over-Sized Part Metal |
| Gear Housing | 8-9 | Gear Housing Assy, Oil Seal, Pump Cover Assy, Lub. Oil Pump Cover, Relief Valve, Spring, Gear Case Frange, Filler Cover |
| Flywheel Housing & Oil Sump | 10-11 | Flywheel Housing, Flywheel Cover Cap, Oil Sump Spacer, Lub. Oil Sump Assy, Oil Seal Case Assy, Oil Seal, Gasket.liquid Optional Part |
| Cylinder Head & Bonnet | 12-13 | Cylinder Hed Assy, Valve Repair Part Guide, Intake Valve, Exhaust Valve, Valve Spring, Spring Retainer, Valve Stem Seal, Valve Cap |
| Suction Manifold & Air Cleaner | 14-15 | Breather Pipe, Int Manifold, Int.manofold Gasket, Air Heater, Air Heater Gasket, Gasket, Bend, Intake Pipe |
| Exhaust Manifold & Silencer | 16-17 | Exhaust Manifold, Exhaust Manifold Gasket, Silencer Pipe, Silencer Gasket, Silencer |
| Camshaft & Driving Gear | 18-19 | Tappet, Push Rod, Camshaft Assy, Thrust Metal, Camshaft Gear, Idle Gear Shaft, Idle Gear Assy, Idle Gear Repair Part Bush |
| Crankshaft & Piston | 20-21 | Crankshaft Assy, Crankshaft Gear, Crankshaft V-Pulley, Flywheel Assy, Ring Gear, Piston Assy, Piston Ring Set, Connecting Rod Assy |
| Lub.Oil System | 22-23 | Lub. Oil Dipstick, Dipstick Guide, Gasket, Lub. Oil Pipe Assy, Lub. Oil Switch, Joint Bolt Assy, Joint PT1, Oil Cooler Assy |
| Cooling Water System | 24-25 | Water Pump Assy, Gasket, Plate, Joint, Thermo. Case Gasket, Cooling Water Pump V-Pulley, V-Belt, Cooling Fan |
| Fuel Injection Pump | 26-27 | Joint, Stopper, Dilevery Valve Assy, Spring, Delivery Holder, Cooling Water Joint, Lifter, Timer Set |
| Governor | 28-29 | Case Packing, Packing, Spring, Regulator Lever, Shaft Retainer, Stop Solenoid, Case Cover |
| Fuel Injection Valve | 30-31 | Fuel Injector, Nozzle Assy, Nozzle Holder Assy, Nozzle Spring, Nozzle Spring Seat, Stop Plate, Injection Pipe Retainer, Retainer |
| Fuel Line | 32-33 | Fuel Filter Bracket, Fuel Oil Filter, Fuel Oil Pipe Assy, Fuel Pipe, Fuel Pump, Separator Assy, Retaining Ring, Element |
| Starting Motor | 34-35 | Starter, Pinion Shaft, Armature Assy, Field Coil Assy, Brush, Rear Cover, Brash Holder Assy, Brush Spring |
| Generator | 36-37 | Belt Adjuster, Alternator, Rotor Assy, Bearing Cover, Drive Flame Assy, Plate, Rear Flame Assy, Pulley |
| Gasket Set | 38-42 | Gasket Set Optional Part, Cylinder Head Gasket, Valve Stem Seal, Nozzle Protector, Nozzle Seat, Cover Gasket, Gasket, Exhaust Manifold Gasket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Hose dimensions (Cooling Water System) | 7mm x 225mm | p. 25 |
| Oil pressure switch activation pressure | 0.5KG | p. 23 |
| Piston ring oversized dimension | 0.25 | p. 21 |
Yanmar 4TNV88-QTBC, TB145 Common Problems This Manual Covers
Yanmar 4TNV88-QTBC injector part number lookup for cylinder misfire diagnosis on 3-cylinder run condition p. 30
Open the Fuel Injection Valve exploded view on page 30. Locate the Injector, Nozzle Assy, Holder Assy, Spring, and Shim Pack listings for each cylinder position. Cross-reference the Pipe Assy part numbers on the same spread to confirm you have the correct fuel line connections for all four cylinders. Verify part numbers against your serial number range before ordering.
Manual Section: Fuel Injection ValveFuel filter and fuel line separator part numbers needed for cold-start diagnosis p. 32
Turn to the Fuel Line diagram on page 32. Identify the Filter, Separator, and O-Ring part numbers in the parts list. Also check the Fuel Pump entry on the same spread. Order both the filter and separator as a set since cold-start air ingestion problems often trace to failed O-rings at separator connections.
Manual Section: Fuel LineWater pump and thermostat part numbers for overheating or coolant loss investigation p. 24
Check the Cooling Water System exploded view on page 24. The Water Pump, Thermostat, and Pipe Assy part numbers are listed there. Replacement hose dimensions verified on page 25 are 7mm x 225mm - confirm your hose part number matches that spec before ordering. Cross-check Fan and Sub-Tank entries if coolant loss traces to those areas.
Manual Section: Cooling Water SystemAir cleaner element part number for black smoke and power loss under load p. 14
Find the Suction Manifold and Air Cleaner diagram on page 14. Locate the Air Cleaner Assy and Air Element part numbers in the adjacent parts list. Note the Heater (intake heater) part number on the same page if you are also addressing cold-start concerns during the same service visit.
Manual Section: Suction Manifold & Air CleanerOil pressure switch and lubrication system part numbers for blue smoke or oil consumption p. 22
Open the Lub. Oil System diagram on page 22. Identify the Dipstick, Strainer, Filter, and Oil Cooler part numbers. The oil pressure switch activation threshold is noted as 0.5KG on page 23 - confirm you are ordering the correct switch rated to that spec. If internal wear is suspected, cross-reference piston and ring oversized parts (0.25mm oversize dimension, page 21) in the Crankshaft and Piston section on page 20.
Manual Section: Lub.Oil SystemGasket set part numbers for cylinder head or fuel injection pump reseal after extended service p. 40
Go to the Gasket Set index on page 40. The set covers CYL.HEAD gaskets, F.I.PUMP gaskets, O-rings, and Valve Stem seals across pages 38 through 42. Identify each sub-component part number individually from the index before ordering - the Gasket Set is broken into multiple line items, not a single assembly number.
Manual Section: Gasket SetFrequently Asked Questions
How do you fix yanmar 4TNV88-QTBC injector part number lookup for cylinder misfire diagnosis on 3-cylinder run condition?
Open the Fuel Injection Valve exploded view on page 30. Locate the Injector, Nozzle Assy, Holder Assy, Spring, and Shim Pack listings for each cylinder position. Cross-reference the Pipe Assy part numbers on the same spread to confirm you have the correct fuel line connections for all four cylinders. Verify part numbers against your serial number range before ordering.
How do you fix fuel filter and fuel line separator part numbers needed for cold-start diagnosis?
Turn to the Fuel Line diagram on page 32. Identify the Filter, Separator, and O-Ring part numbers in the parts list. Also check the Fuel Pump entry on the same spread. Order both the filter and separator as a set since cold-start air ingestion problems often trace to failed O-rings at separator connections.
How do you fix water pump and thermostat part numbers for overheating or coolant loss investigation?
Check the Cooling Water System exploded view on page 24. The Water Pump, Thermostat, and Pipe Assy part numbers are listed there. Replacement hose dimensions verified on page 25 are 7mm x 225mm — confirm your hose part number matches that spec before ordering. Cross-check Fan and Sub-Tank entries if coolant loss traces to those areas.
How do you fix air cleaner element part number for black smoke and power loss under load?
Find the Suction Manifold and Air Cleaner diagram on page 14. Locate the Air Cleaner Assy and Air Element part numbers in the adjacent parts list. Note the Heater (intake heater) part number on the same page if you are also addressing cold-start concerns during the same service visit.
How quickly can I access this manual after buying?
Immediate download of the complete 42-page searchable Parts Catalog. Access it on any device, from a laptop at your desk to a phone in the field.
Can I print specific sections of this Yanmar 4TNV88-QTBC, TB145 Parts Catalog?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
Document Quality
This document is a scanned PDF with a mixed OCR layer. You can search and copy text on pages 5 through 42, which contain the parts lists, but pages 1-4 are image-only. The text quality is crisp and easy to read throughout. Diagrams and illustrations are clear raster images, with labels readable at normal viewing zoom, though they may pixelate on high zoom. Pages are clean with no significant scan artifacts or skewed content, except for page 30 which contains mostly garbled text, and page 4 which is an intentional blank 'Memo' page.
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