Part of the Yanmar Parts Manuals.
A scrawled casting number off a stripped block is a poor way to order parts for an engine that is already apart on the stand. This PDF puts the factory part numbers for the Yanmar 4TNE88 small vertical engine in front of you, publication Y00B5943, covering the 4TNE88, 4TNE88-BVA, 4TNE88-EBVA, and 4TNE88-(E)BVA(VIO50-1) variants.
Across 38 pages it works through the engine system by system: cylinder block, gear housing, cylinder head and bonnet, crankshaft and piston, fuel injection pump and pipes, governor, cooling water and lube oil systems, starting motor, and generator, each figure paired with its numbered parts list. Undersize main and thrust metals, gasket kits, and hardware down to individual plugs and studs are itemized.
Every day the engine sits in pieces waiting on a part that came back wrong is a day lost. This catalog gets the order right the first time.
What's Inside This Yanmar 4TNE88-(E)BVA Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 1-2 | Cylinder Block Assy, Main Bearing, Thrust Metal, Camshaft Bush, Cylinder Head Gasket, Main Metal |
| Cylinder Block | 3-4 | Gear Housing Assy, Oil Seal, Gears Housing Flange, Lub. Oil Supply Cap, Gasket, Knock Pipe, Retainer, Hydraulic Oil Pump Cover |
| Gear Housing | 5-6 | Flywheel Housing, Flywheel Cover Cap, Oil Sump Assy, Oil Seal Case Assy, Oil Seal, Oil Sump Spacer |
| Flywheel Housing & Lub. Oil Sump | 7-8 | Cylinder Head Assy, Valve Guide, Intake Valve, Exhaust Valve, Valve Spring, Spring Retainer, Valve Stem Seal, Valve Cap |
| Cylinder Head & Bonnet | 9-10 | Suction Silencer, Air Cleaner Assy, Dust Canister, Element Retainer, Air Cleaner Element, Brace Assy, Rubber Seat, Cleaner Support Assy |
| Suc. Manifold & Air Cleaner | 11-12 | Gasket, Silencer, Silencer Stay, Exhaust Manifold, Exhaust Manifold Gasket |
| Exh. Manifold & Silencer | 13-14 | Camshaft Assy, Camshaft Gear, Thrust Metal, Push Rod, Tappet, Idle Gear Shaft, Gear W/ Bush, Idle Gear Bush |
| Camshaft & Driving Gear | 15-16 | Crankshaft Assy, Crankshaft Gear, Crankshaft V-Pulley, Flywheel Assy, Ring Gear, Piston W/ Rings, Piston Ring Set, Piston W/ Ring |
| Crankshaft & Piston | 17-18 | Lub. Oil Pump Assy, Lub. Oil Pump Gasket, Dipstick Guide, Lub. Oil Dipstick, Gasket, Lub. Oil Pipe Assy, Oil Pressure Switch, Lub. Oil Switch |
| Lub. Oil System | 19-20 | Cooling Water Pump Assy, Coolant Pump Assy, Cooling Water Pump Gasket, Gasket, Cw Pump Pk, V-Belt, Fan, V-Pulley |
| Cooling Water System | 21-23 | Pump W/ Governor & Feed Pump, Fuel Injection Pump Assy, Camshaft, Thrust Ball Bearing, Cam Shaft Support, Support, Plunger W/ Barrel, Retainer a |
| Fuel Injection Pump | 24-25 | Fuel Injection Valve Assy, Fuel Injection Nozzle Assy, Nozzle Holder Assy, Nozzle Spring, Nozzle Spring Seat, Stop Plate, Injection Pipe Retainer, Fuel Injection Pipe |
| Fuel Injection Pipe | 26-27 | Fuel Strainer Assy, Taper Valve, Taper Valve Spring, Fuel Element, Lever, Strainer Cup, Retaining Ring, Spring |
| Fuel Pipe | 28-30 | Governor Case, Packing, Cover, Link, Governor Weight Assy, Sleeve, Control Shaft Assy, Shaft Spacer |
| Governor | 31-32 | Starting Motor, Armatuer, Bearing, Field Coil Assy, Brush, Brush Holder Assy, Brush Spring, Start Brush Spring |
| Starting Motor | 33-34 | Generator, Rotor Assy, Stator Assy, Rear Cover Assy, Regulator Brush Assy, Brush Assy, Fan Side Guide, Diode Assy |
| Generator | 35-36 | Gasket Set, Cylinder Head Gasket, Valve Stem Seal, Nozzle Protecter, Nozzle Protector, Nozzle Seat, Bonnet Gasket, Exhaust Manifold Gasket |
| Gasket Set (Optional) & Tools | 37-37 | Optional |
| Figure Summary | 38-38 | Engine 4TNE88-(E)BVA, Cylinder Block, Gear Housing, Flywheel Housing &Lub.Oil Sump, Cylinder Head & Bonnet, Suc.Manifold & Air Cleaner, Exh.Manifold & Silencer, Camshaft & Driving Gear |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| V-Belt Size | A-38 | p. 20 |
| Drain Plug Size | M22 | p. 6 |
| Spring Pin Size | 6mm x 12mm | p. 8 |
| Wire Size | 0.6mm | p. 30 |
Yanmar 4TNE88-(E)BVA Common Problems This Manual Covers
Hard starting after sitting overnight
An engine that needs repeated priming before it fires usually has a tired fuel strainer element or a joint drawing air in the supply run. The Fuel Injection Pipe section itemizes the fuel strainer assembly, element, taper valve, and retaining ring so you can renew the whole path instead of guessing at one fitting.
Manual Section: Fuel Injection Pipe p. 26Rough running and smoke from tired nozzles
Worn injector nozzles show up as rough idle, low power, and dirty exhaust. The Fuel Injection Pump section lists the injection valve and nozzle assemblies down to the nozzle spring, seat, and holder, so you can order complete nozzle sets rather than mixing old and new internals.
Manual Section: Fuel Injection Pump p. 24Overheating and slow coolant loss
Creeping temperature and a coolant level that never quite holds are common complaints on aging 4TNE88s. The Cooling Water System section covers the cooling circuit parts, letting you replace suspect components with the correct numbers before a hot spell turns into a head gasket job.
Manual Section: Cooling Water System p. 21Oil weeping at the sump joint
A film of oil along the sump flange or around the drain plug is typical after years of service. The Flywheel Housing & Lub. Oil Sump section lists the oil sump assembly and the M22 drain plug along with the housing hardware, so the reseal goes back together with fresh parts throughout.
Manual Section: Flywheel Housing & Lub. Oil Sump p. 7Reground crankshaft needs undersize bearings
If the crank journals have been cut, standard main metals are scrap. The Cylinder Block section lists 0.25 undersize main metals and thrust metals alongside the standard main bearings, camshaft bush, cylinder head studs, and head gasket, which is exactly the shopping list for a bottom end rebuild.
Manual Section: Cylinder Block p. 3Slow cranking and starter drag
A starter that spins slow on a good battery points to worn brushes or dry bearings inside the motor. The Starting Motor section breaks the unit down to the armature, field coil assembly, bearings, and brushes, so you can rebuild it instead of paying for a complete exchange unit.
Manual Section: Starting Motor p. 33Low power from a choked air cleaner
A starved intake robs power and blackens the exhaust long before anything is mechanically wrong. The Suc. Manifold & Air Cleaner section lists the cleaner assembly, element, dust canister, and retainer so the intake side can be brought back to spec with a parts order.
Manual Section: Suc. Manifold & Air Cleaner p. 11Frequently Asked Questions
Which Yanmar engine models does this parts catalog cover?
It covers the Yanmar 4TNE88 small vertical engine in its 4TNE88, 4TNE88-BVA, 4TNE88-EBVA, and 4TNE88-(E)BVA(VIO50-1) variants, under Yanmar publication number Y00B5943.
Is this a service manual with torque specs and rebuild procedures?
No, this is the factory parts catalog: figures and numbered parts lists for each system, from the cylinder block through the governor, starting motor, and generator. Use it to identify exact part numbers when ordering; pair it with a service manual for clearances and torque sequences.
My crankshaft was ground undersize. Are matching bearings listed?
Yes. The Cylinder Block section lists 0.25 undersize main metals and thrust metals alongside the standard main bearings, so you can order the set that matches the regrind the first time. p. 3
Does the catalog identify the correct V-belt?
Yes, the catalog lists the V-belt as size A-38, and the crankshaft V-pulley itself appears in the Camshaft & Driving Gear section, so both sides of the drive can be ordered by number. p. 19
How will I receive this Yanmar 4TNE88-(E)BVA & variants Parts Catalog?
A 38-page Parts Catalog in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Are there any print restrictions on this manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
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