Part of the Yanmar Parts Manuals.
With a 4TNV88-QTB stripped on the stand, the difference between a clean reassembly and a second teardown is usually one wrong part number. This Yanmar parts catalog, publication P-TB145EBB for TB145 applications, gives you the exploded views and factory part numbers for the whole engine, from the cylinder block and crankshaft through the injection pump internals and governor, so every bearing, gasket, and O-ring you order matches what came off.
It covers the 4TNV88-QTB in both cab and canopy (QTB1) configurations, from engine serial number 14513261 onward. Eighteen illustrated sections run through 44 pages: cylinder head and valves, camshaft and gears, lubricating oil and cooling water systems, fuel injection pump inner parts, injectors, fuel line, starter, alternator, and the complete gasket set.
The PDF is bookmarked and downloads instantly, so it is on your phone or laptop at the bench, the parts counter, or wherever the engine sits.
What's Inside This Yanmar 4TNV88-QTB / QTB1 (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 Case 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, Liquid Optional Part Gasket |
| 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, Silencer Gasket, Silencer Pipe |
| 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, Oil Cooler Assy, Filter Bracket Assy, Lub. Oil Switch, Joint Bolt Assy |
| Cooling Water System | 24-25 | Water Pump Assy, Gasket, Plate, Joint, Thermo. Case Gasket, V-Pulley, V-Pulley S, V-Belt |
| Fuel Injection Pump | 26-27 | Fuel Injection Pump Assy, Fip Support, Stop Solenoid, Bolt |
| Fuel Injection Pump (Inner Parts) | 28-29 | Joint, Stopper, Dilevery Valve Assy, Spring, Delivery Holder, Cooling Water Joint, Lifter, Timer Set |
| Governor (Inner Parts) | 30-31 | Case Packing, Packing, Spring, Regulator Lever, Stop Solenoid, Case Cover |
| Fuel Injection Valve | 32-33 | Fuel Injector, Nozzle Assy, Nozzle Holder Assy, Nozzle Spring, Nozzle Spring Seat, Stop Plate, Injection Pipe Retainer, Retainer |
| Fuel Line | 34-35 | Filter Bracket, Fuel Filter, Fuel Oil Pipe Assy, Fuel Pipe, Fuel Pump, Separator Assy, Retaining Ring, Element |
| Starting Motor | 36-37 | Starter, Pinion Shaft, Armature Assy, Field Coil Assy, Brush, Rear Cover, Brash Holder Assy, Brush Spring |
| Generator | 38-39 | Belt Adjuster, Alternator, Rotor Assy, Bearing Cover, Drive Flame Assy, Plate, Rear Flame Assy, Pulley |
| Gasket Set | 40-44 | 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 |
|---|---|---|
| Fuel Pipe Dimensions | D13 x L400 | p. 35 |
| Parallel Pin Dimensions | 8x16 mm | p. 11 |
| Spring Pin Dimensions | 6x12 mm | p. 13 |
Yanmar 4TNV88-QTB / QTB1 (TB145) Common Problems This Manual Covers
Hard starting in cold weather
Cold-start trouble on the 4TNV88 usually comes down to a dead intake heater, a tired air cleaner element, or restricted fuel supply. The Suction Manifold & Air Cleaner section lists the intake heater, manifold gaskets, and air cleaner element with their part numbers so you replace parts instead of guessing.
Manual Section: Suction Manifold & Air Cleaner p. 14Overheating and coolant leaks
A failing water pump, stuck thermostat, or leaking sub-tank will cook a diesel long before the gauge tells the whole story. The Cooling Water System section breaks out the water pump assembly, thermostat, cooling fan, V-pulley, and sub-tank so you can order the full repair in one pass.
Manual Section: Cooling Water System p. 24Black smoke and rough running
Worn or dribbling injector nozzles show up as black smoke, uneven idle, and lost power. The Fuel Injection Valve section itemizes the nozzle assemblies, holders, springs, and injection pipes so a nozzle refresh goes together with the right hardware.
Manual Section: Fuel Injection Valve p. 32Water and dirt in the fuel
Contaminated fuel is the fastest way to kill an injection pump, and the filters and separator are the cheap insurance. The Fuel Line section covers the fuel filters, water separator assembly, fuel pump, and fuel oil pipe assemblies by part number.
Manual Section: Fuel Line p. 34White smoke and head gasket failure
Coolant getting into a cylinder after an overheat means the head comes off, and a reused seal is a redo. The Gasket Set section lists the cylinder head gasket, valve stem seals, injection pump O-rings, and exhaust manifold gaskets for a complete reseal.
Manual Section: Gasket Set p. 40High-hour bottom end wear
Owners report 4TNV88 engines running to very high hours before the bottom end finally needs attention, and by then it is pistons, rings, and bearings all around. The Crankshaft & Piston section covers the crankshaft assembly, piston assemblies, connecting rods, and bearings for a full rebuild order.
Manual Section: Crankshaft & Piston p. 20Slow cranking or starter failure
A dragging pinion or worn armature turns every start into a gamble, especially on cold mornings. The Starting Motor section breaks the starter down to the pinion, shaft, armature assembly, field coil, ball bearings, and housing so you can repair it instead of replacing the whole unit.
Manual Section: Starting Motor p. 36Frequently Asked Questions
Which engine does this parts catalog cover?
The Yanmar 4TNV88-QTB in TB145 applications, in both cab and canopy (QTB1) configurations, from engine serial number 14513261 onward. It is Yanmar publication P-TB145EBB, in English.
Is this a service manual with torque specs and procedures?
No. This is a parts catalog: exploded diagrams with factory part numbers for identifying and ordering components. It does not include torque sequences, clearances, or repair procedures, so pair it with a service manual when you need those figures rather than guessing them.
Does it break down the injection pump and governor internals?
Yes. The Fuel Injection Pump (Inner Parts) section covers the delivery valve assemblies, lifters, timer set, packings, and head, and the Governor (Inner Parts) section follows with the regulator lever, case, and stop solenoid. p. 28
Can I find part numbers for a full engine reseal?
Yes. The Gasket Set section lists the cylinder head gasket, valve stem seals, fuel injection pump O-rings, and exhaust manifold gaskets, and each system section shows its own gaskets and seals in place on the exploded views. p. 40
What format is this manual in?
Immediate download of the complete 44-page searchable Parts Catalog. Access it on any device, from a laptop at your desk to a phone in the field.
Is this Yanmar TB145 4TNV88-QTB(cab) & variants Parts Catalog printable?
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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