Part of the Yanmar Parts Manuals.
Spin an engine on the stand with the sump dropped and you meet a dozen small parts, plugs, metal caps, bushes, that all need names before anything gets ordered. This Yanmar parts catalog, publication Y00W2770, puts part numbers to every one of them on the 4TNE98-BQFLC, the diesel fitted to forklift applications.
Fifteen bookmarked sections break the engine down from Cylinder Block through Gasket Set: exploded views for the crankshaft and pistons, camshaft and driving gear, injection pump and injectors, cooling water system, starting motor, and generator. The 4TNE98 family carries several suffixes, and ordering off a lookalike catalog is how the wrong oil seal ends up on your bench, so having the exact BQFLC book matters.
At 21 pages and 0.78 MB, the PDF sits on a phone as easily as a bench laptop, so the diagrams are wherever the engine is.
What's Inside This Yanmar 4TNE98-BQFLC (Forklift) Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 4 | Cylinder Block Assy, Camshaft Bush, Thrust Bearing Assy, Main Bearing Set, Head Gasket |
| Gear Housing | 5 | Gearcase Cover Cmp, Oil Seal, Fuel Injection Pump Cover, Filler Cover, Lub. Oil Pump Assy, Hydraulic Oil Pump Cover, Bearing # |
| Flywheel Housing & Oil Sump | 6 | Flywheel Housing, Oil Seal, Oil Sump Assy, Pin |
| Cylinder Head & Bonnet | 7 | Engine Lifter, Cylinder Head Assy, Suction Valve, Exhaust Valve, Valve Spring, Spring Retainer, Valve Stem Seal, Valve Cap |
| Suction & Exhaust Manifold | 8 | Suction Manifold Gasket, Int Manifold, Exhaust Manifold, Gasket, Joint, Silencer Gasket |
| Camshaft & Driving Gear | 9 | Tappet, Push Rod, Camshaft Assy, Thrust Metal, Camshaft Gear, Idler Shaft, Idle Gear Assy, Idle Gear Bush |
| Crankshaft & Piston | 10 | Crankshaft Comp, Crankshaft Gear, Crankshaft V-pulley, Piston Assy, Ring Set, Connecting Rod Assy, Crankpin Metal Assy, Piston Pin Bush |
| Lub.Oil System | 11 | Dipstick, Dipstick Guide, Filter 80X80L, Lub. Oil Pipe Assy, Lub. Oil Switch, Pipe |
| Cooling Water System | 12 | Pulley, V-belt, Fan, Thermostat Gasket, Thermostat Cover, Gasket, Thermostat, Cooling Water Pump Gasket |
| Fuel Injection Pump | 13 | Retainer, Bracket Stay, Fuel Oil Pump Assy, Axel Wire Bracket |
| Fuel Injection Valve | 14 | Injection Valve Assy, Nozzle Assy, Retainer, Fuel Injection Pipe No, F.o.return Pipe Assy, Fuel Return Pipe, Return Gasket |
| Fuel Filter | 15 | Fuel Oi Filter Assy, Filter Body Assy, Level Sensor Assy, Filter Element Assy, Fuel Pipe, Fuel Oil Strainer |
| Starting Motor | 16 | Starter, Armature Assy, Field Coil Assy, Brush, Brash Holder Assy, Rear Cover, Magnetic Switch Assy, Shift Lever Set |
| Generator | 17 | Rotor Assy, Front Bracket Assy, Pulley, Rear Bracket, Spacer, Belt Ajuster, Qgs Controller |
| Gasket Set | 18-21 | Head Gasket, Valve Stem Seal, Nozzle Protecter, Nozzle Gasket, Bonnet Gasket, Suction Manifold Gasket, Cooling Water Pump Gasket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Starter Motor Power | 2.3KW | p. 16 |
Yanmar 4TNE98-BQFLC (Forklift) Common Problems This Manual Covers
Oil leaks at the sump and seals
Weeping around the sump and housing faces is one of the most common complaints on this engine as the seals age. The Flywheel Housing & Oil Sump section breaks out the housing, sump assembly, oil seals, and drain plug so you order the exact seal instead of guessing from a smudged casting.
Manual Section: Flywheel Housing & Oil Sump p. 6Hard starting after sitting
A 4TNE98 that cranks long after a layup usually points to fuel contamination or a starved filter. The Fuel Filter section lists the filter assembly, element assembly, level sensor, pipes, and clamps, so the whole supply side can be renewed in one order.
Manual Section: Fuel Filter p. 15Smoke and lost power from injectors
Worn nozzles show up as smoke and sluggish response under load. The Fuel Injection Valve section covers the injection valve assembly, nozzle assembly, retainer, shim sets, pipes, and gaskets, everything needed to send the injectors out and reseal them on return.
Manual Section: Fuel Injection Valve p. 14Overheating and coolant loss
Thermostat and water pump failures are routine service events on this engine. The Cooling Water System section diagrams the water pump assembly, thermostat, fan, pulley, V-belt, and gaskets so the cooling side can be rebuilt with correct Yanmar numbers.
Manual Section: Cooling Water System p. 12Starter clicks but will not crank
Starters on these engines commonly fail at the brushes or the magnetic switch rather than as a whole unit. The Starting Motor section lists the 2.3KW starter along with the armature assembly, brushes, magnetic switch assembly, and pinion assembly as separate items.
Manual Section: Starting Motor p. 16Low compression from worn rings
Oil consumption and weak compression at rebuild time come back to the bottom end. The Crankshaft & Piston section itemizes the crankshaft, piston assemblies, ring sets, connecting rod assemblies, and flywheel so a full bottom-end parts list can be written straight off the page.
Manual Section: Crankshaft & Piston p. 10Resealing the engine at reassembly
Every teardown ends with a pile of gaskets that must not go back on. The Gasket Set section, pages 18 through 21, covers the head gasket, valve stem seals, O-rings, and seal washers for the whole engine.
Manual Section: Gasket Set p. 18Frequently Asked Questions
Which engine does this parts catalog cover?
The Yanmar 4TNE98-BQFLC diesel in its forklift application, Yanmar publication Y00W2770. The 4TNE98 family includes multiple suffix variants with separate catalogs, so check the suffix on your engine plate against this publication number before ordering parts.
Does it include torque specs or repair procedures?
No. This is a parts catalog: exploded diagrams with part numbers for every assembly from Cylinder Block through Gasket Set. Valve lash, head bolt torque sequences, and bearing clearances live in the service manual; use this book to identify and order the hardware for the job.
Can I identify starter motor parts from this catalog?
Yes. The Starting Motor section covers the 2.3KW starter and lists the armature assembly, brushes, magnetic switch assembly, ball bearing, and pinion assembly individually, so you can repair the starter on the bench instead of buying a complete replacement unit. p. 16
Are gaskets and seals listed?
Yes. The Gasket Set section runs from page 18 to 21 and covers the head gasket, valve stem seals, O-rings, and seal washers, while individual gaskets also appear in each system's own diagram, such as the manifold and water pump gaskets. p. 18
What do I get after purchasing this Yanmar 4TNE98-BQFLC manual?
Immediate download of the complete 21-page searchable Parts Catalog. Access it on any device, from a laptop at your desk to a phone in the field.
Am I able to print pages from this manual?
The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
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