Part of the Yanmar Parts Manuals.
Every teardown of a small Yanmar diesel ends at the same sticking point: near-identical gaskets, metals, and seals, and only one part number that actually fits your block. This factory parts catalog, Yanmar publication Y00B5141, settles that for the 4TNE88-B1 engine, also listed against model B50-2A. Its 37 pages break the engine into 17 sections of numbered part listings, from Cylinder Block and Crankshaft & Piston through the Fuel Injection Pump, Governor, Starting Motor, and Generator.
At the bench it earns its keep matching the number on a worn plunger, nozzle holder, or main metal to the correct line before you order, instead of losing a week to a part that almost fits. The optional complete gasket set is listed too, so a head job or full reseal goes on order as one line item.
The English-language PDF is 0.63 MB, downloads immediately after purchase, and can be printed page by page for the bench.
What's Inside This Yanmar 4TNE88-B1, B50-2A, Y00B5141 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 1-3 | Cylinder Block Assy, Camshaft Bush, Main Metal, Main Bearing, Thrust Metal, Cylinder Head Gasket |
| Gear Housing | 4-5 | Gear Housing Assy, Oil Seal, Gears Housing Flange, Lub. Oil Supply Cap, Hydraulic Oil Pump Cover, Gasket, Knock Pipe, Retainer |
| Flywheel Housing & Lub. Oil Sump | 6-7 | Flywheel Housing, Flywheel Cover Cap, Oil Sump Assy, Oil Sump Spacer, Oil Seal Case Assy, Oil Seal |
| Cylinder Head & Bonnet | 8-9 | Cylinder Head Assy, Valve Guide, Intake Valve, Exhaust Valve, Valve Spring, Spring Retainer, Valve Stem Seal, Valve Cap |
| Suc. Manifold & Air Cleaner | 10-11 | Suction Silencer, Air Cleaner Assy, Case, Dust Pan Assy, Element Retainer, Element, Brace Assy, Rubber Seat |
| Exh. Manifold & Silencer | 12-13 | Gasket, Silencer, Silencer Stay, Exhaust Manifold, Mainfold Gasket |
| Camshaft & Driving Gear | 14-15 | Camshaft Assy, Camshaft Gear, Thrust Metal, Push Rod, Tappet, Idle Gear Shaft, Gear W/ Bush, Idle Gear Bush |
| Crankshaft & Piston | 16-17 | Crankshaft Assy, Crankshaft Gear, Crankshaft V-Pulley, Flywheel Assy, Ring Gear, Piston W/ Rings, Piston Ring Set, Piston W/ Ring |
| Lub. Oil System | 18-19 | Lub. Oil Pump Assy, Lub. Oil Pump Gasket, Dipstick Guide, Lub. Oil Dipstick, Oil Pressure Switch, Gasket, Lub. Oil Pipe Assy, Strainer Bracket |
| Cooling Water System | 20-21 | Cooling Water Pump, Cooling Water Pump Gasket, V-Belt, V-Belt A37, V-Pulley, Cooling Fan, Spacer, Joint PT1 |
| Fuel Injection Pump | 22-24 | Pump W/ Governor & Feed Pump, Camshaft, Thrust Ball Bearing, Cam Shaft Support, Plunger W/ Barrel, Retainer a, Plunger Spring Shoe, Plunger Spring |
| Fuel Injection Pipe | 25-26 | Fuel Injection Valve Assy, Fuel Injection Nozzle Assy, Nozzle Holder Assy, Nozzle Spring, Nozzle Spring Seat, Stop Plate, Injection Pipe Retainer |
| Fuel Pipe | 27-28 | Fuel Strainer Assy, Taper Valve, Taper Valve Spring, Fuel Element, Lever, Strainer Cup, Retaining Ring, Spring |
| Governor | 29-30 | Governor Case, Packing, Cover, Link, Governor Weight Assy, Sleeve, Control Shaft Assy, Shaft Spacer |
| Starting Motor | 31-32 | Starter, Armature Assy, Bearing, Field Coil Assy, Brush, Brush Holder Assy, Brush Spring, Rear Cover |
| Generator | 33-34 | Rotor Assy, Starter Assy, Rear Cover Assy, Regulator Brush Assy, Brush Assy, Fan Side Guide, Diode Assy |
| Gasket Set (Optional) & Tool | 35-37 | Gasket Set, Cylinder Head Gasket, Valve Stem Seal, Nozzle Protecter, Nozzle Seat, Bonnet Gasket, Mainfold Gasket, Lub. Oil Pump Gasket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Parallel Pin Dimensions | 8x16 mm | p. 6 |
| Drain Plug Thread Size | M22 | p. 6 |
| V-Belt Size | A-37 | p. 20 |
Yanmar 4TNE88-B1, B50-2A, Y00B5141 Common Problems This Manual Covers
Hard starting or power loss under load
When the engine cranks long and smokes before it fires, worn pump internals or a lazy feed pump are the usual suspects. The Fuel Injection Pump section itemizes the plunger with barrel, tappet assembly, control rack, and fuel feed pump, so you replace the worn piece instead of the whole pump.
Manual Section: Fuel Injection Pump p. 22Dribbling or misfiring injectors
A nozzle that dribbles instead of atomizing shows up as a rough miss and gray smoke. The Fuel Injection Pipe section lists the injection valve assemblies, nozzle assemblies, holders, retainers, and injection pipes, so the correct nozzle goes on order the first time.
Manual Section: Fuel Injection Pipe p. 25Fuel starvation from a clogged strainer
Dirty fuel plugs the strainer element and the engine surges, then dies under load. The Fuel Pipe section carries the fuel strainer assembly, element, taper valve, and fuel pipes, so a full fuel-side refresh is one order.
Manual Section: Fuel Pipe p. 27Low oil pressure warnings
A flickering oil pressure light on a high-hour engine means pulling the pump and filter before the bearings pay the price. The Lub. Oil System section lists the oil pump assembly, oil pressure switch, filter, dipstick, and pipes by part number.
Manual Section: Lub. Oil System p. 18Overheating and glazed V-belts
A tired water pump or slipping belt lets the temperature creep while the engine sits out of service. The Cooling Water System section lists the water pump, thermostat, cooling fan, V-pulley, and the A-37 V-belt with their part numbers.
Manual Section: Cooling Water System p. 20Hunting idle and unstable speed
When engine speed wanders and the rack chatters, wear in the governor linkage is the likely cause. The Governor section identifies the governor weight assembly, control shaft assembly, rack lever assembly, links, and case so each worn pivot can be ordered individually.
Manual Section: Governor p. 29Blow-by and oil consumption at overhaul
Heavy blow-by and rising oil use mean the bottom end is due. The Crankshaft & Piston section gives the piston and bearing part numbers you need to spec the rebuild order correctly before the block goes back together.
Manual Section: Crankshaft & Piston p. 16Frequently Asked Questions
Which engine does this parts catalog cover?
It covers the Yanmar 4TNE88-B1 diesel engine under Yanmar publication number Y00B5141, and is also listed against model B50-2A. Check the designation on your engine nameplate against 4TNE88-B1 before ordering parts from it.
Does it include a complete gasket set listing?
Yes. The Gasket Set (Optional) & Tool section lists the optional gasket set, including the cylinder head gasket, non-asbestos gaskets, O-rings, the fuel injection pump seal, and valve stem seals, each with its own part number. p. 35
Can I order individual fuel injection pump parts from it?
The Fuel Injection Pump section breaks the pump down to the plunger with barrel, tappet assembly, control rack, fuel feed pump, and drive gear, so you can order a single worn component rather than a complete pump assembly. p. 22
Does it give the V-belt size for this engine?
Yes. The Cooling Water System section lists the V-belt as size A-37 with its Yanmar part number, alongside the water pump, V-pulley, cooling fan, thermostat, and cooling water pipes. p. 20
Is this manual a PDF I download?
Instant PDF download. You get the full 37-page searchable Parts Catalog immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Can I print specific sections of this manual?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
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