All 37 pages of this Yanmar 4TNE88-3BY, 3CY, and 4TNE88-3CY Parts Catalog (OEM #Y00B5422) cover one engine family from cylinder block to generator, every sub-assembly mapped and numbered. Inside, 17 parts-list sections walk you through the cylinder block, gear housing, flywheel housing and oil sump, cylinder head, intake and exhaust manifolds, camshaft, crankshaft and piston, lubrication system, cooling system, fuel injection pump, governor, injection pipes, fuel circuit, starting motor, and generator. Each section pairs an exploded-view diagram with OEM part numbers and component names so you can identify exactly what you're ordering before you pick up the phone. The V-belt cross-references as an A37; the oil drain plug threads M22. Your supplier needs a number, not a description. Built-in bookmarks get you to the right section in one click; download the PDF and have the correct part number ready before you reach the counter.
What's Inside This Yanmar 4TNE88-3BY / 3CY Series Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Engine | 1 | - |
| Cylinder Block | 2-3 | Block Assy, Cylinder, Plug, Bolt, Main Bearing, Bush Camshaft |
| Gear Housing | 4-5 | Flange, Housing Assy, Gear, Seal Oil, O-Ring, Bolt |
| Flywheel Housing & Oil Sump | 6-7 | Housing, Flywheel, Cap, Flywheel Cover, Sump Assy, Oil, Drain Plug, Case Assy |
| Cylinder Head & Bonnet | 8-9 | Head Assy, Cylinder, Guide Valve, Valve Intake, Valve Exhaust, Shaft Assy, Rocker, Bonnet Assy |
| Suc. Manifold & Air Cleaner | 10-11 | Manifold, Air Intake, Cleaner, Air, Pan Assy, Dust, Case Asy, Air Cleaner |
| Exh. Manifold & Silencer | 12-13 | Manifold, Exhaust, Gasket, EXH.MANIFOLD, Stud, Silencer, Stay |
| Camshaft & Driving Gear | 14-15 | Camshaft Assy, Gear Camshaft, Shaft Idle Gear, Gear W/BUSH, Driving Set, Ho-Pump, Ball Bearing |
| Crankshaft & Piston | 16-17 | Crankshaft Assy, Piston W/RINGS, Connecting Rod, Flywheel Assy, Crankpin Bearing, Piston Pin |
| Lub.Oil System | 18-19 | Pump Assy, Lub. Oil, Dipstick, Oil Filter, Oil Pressure Sender, Oil Pipe |
| Cooling Water System | 20-21 | Pump Assy, C.WATER, V-Belt, Fan, Thermostat, Cooling Water Pipe, Thermostat Case |
| Fuel Injection Pump | 22-23 | Pump Assy, Fuel Inj., Plunger, Delivery Valve, Control Rack, Fuel Feed Pump, Governor |
| Governor | 24-25 | Lever Assy, Control Shaft, Spring, Stop Solenoid, Control Lever |
| Fuel Injection Pipe | 26-27 | Nozzle Assy, Nozzle Holder, Nozzle Spring, Fuel Return Pipe, Check Valve |
| Fuel Pipe | 28-29 | Fuel Strainer, Taper Valve, Fuel Element, Fuel Pump, Joint, Fuel Oil Pipe |
| Starting Motor | 30-32 | Armature Assy, Brush Holder, Pinion Assy, Clutch Assy, Magnetic Switch |
| Generator | 33-34 | Rotor Assy, Ball Bearing, Brush Assy, Regulator, Diode Assy, Pulley |
| Gasket Set (Optional) & Tool | 35-37 | Gasket, Cylinder Head, O-Ring, Seal, Valve Stem, Liquid, Wrench |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Pipe, Knock Length | 18 inches | p. 4 |
| Nut size | M8 | p. 4 |
| Drain Plug size | M22 | p. 6 |
| V-Belt type | A37 | p. 20 |
| Filter dimensions | 80x80L | p. 18 |
| Bolt W/Washer M8 | M8 x 70 mm | p. 28 |
Yanmar 4TNE88-3BY / 3CY Series Common Problems This Manual Covers
Yanmar 4TNE88 oil filter part number unclear, dimensions and fitment differ across four model variants in catalog p. 18
Open the Lub. Oil System parts list on page 18. Find the Oil Filter line item; catalog dimensions are listed as 80x80L, so verify your replacement matches before ordering. Confirm the part number in your variant's column (3BY, 3CY, 3CY B6U, or 4TNE88-3CY). The oil pressure sender and dipstick are separate line items on the same pages.
Manual Section: Lub.Oil SystemWater pump impeller, thermostat, and V-belt part numbers needed, cooling assembly spans multiple catalog entries p. 20
Check the Cooling Water System exploded view on page 20. The V-belt is cataloged as type A37; record its part number separately if bundling with the impeller order. The thermostat and thermostat case are individual line items. Verify each part number in your model variant's column, as the pump assy and sub-components are listed separately.
Manual Section: Cooling Water SystemOil sump drain plug replacement part number unknown, need correct size to match original hardware p. 6
Open the Flywheel Housing & Oil Sump section on page 6. The drain plug is listed as M22 in the parts table; match the part number to that spec before ordering. The Sump Assy and Oil Case Assy are cataloged as separate assemblies, so confirm which sub-assembly your drain plug belongs to before pulling a part number.
Manual Section: Flywheel Housing & Oil SumpFuel strainer and fuel element part numbers needed, inline filter components listed as separate assemblies in catalog p. 28
Pull up the Fuel Pipe section on page 28. The Fuel Strainer and Fuel Element are separate line items with individual part numbers. Mounting bolts in this section are M8 x 70 mm; note the BOLT W/WASHER part number if ordering complete hardware. The Taper Valve and Fuel Feed Pump Assy are also cataloged separately on these pages.
Manual Section: Fuel PipeGear housing front seal and O-ring part numbers unclear, seal assembly hardware spans multiple sizes in catalog p. 4
Open the Gear Housing parts list on page 4. Locate the Seal Oil and O-Ring entries as separate line items. Housing assembly hardware includes M8 nuts; record the nut part number if ordering a complete seal kit. The housing assy and flange are cataloged individually, so verify which components your application requires across the 3BY, 3CY, and 4TNE88-3CY variants.
Manual Section: Gear HousingFrequently Asked Questions
What are the replacement specifications for fuel filter?
For fuel filter replacement, the Strainer Assembly Fuel has part number 129100-55621, the Filter Assembly Fuel has part number 129612-55620, and the Strainer Fuel Oil Inlet has part number 129052-55630. These part numbers cover both the 3BY and 3CY variants.
What are the replacement specifications for air filter?
For air filter replacement, the Cleaner Air component has part number 129136-12510. The air cleaner element has part number 121120-12901. These part numbers apply across the 4TNE88-3BY and 3CY variants.
Which oil filter part number fits the Yanmar 4TNE88 across the 3BY and 3CY variants?
Open the Lub. Oil System parts list on page 18. Verify your replacement matches the 80x80L dimensions listed in the catalog. Confirm the part number in your variant column (3BY, 3CY, 3CY B6U, or 4TNE88-3CY) before ordering, as the oil pressure sender and dipstick are separate line items.
What part numbers cover the water pump, thermostat, and V-belt for the 4TNE88 cooling system?
Check the Cooling Water System exploded view on page 20. The V-belt is cataloged as type A37. The thermostat and thermostat case are individual line items. Verify each part number in your model variant column, as the pump assembly and sub-components are listed separately.
Can I print or download this parts catalog for offline use?
Yes. After purchase you can download and print the PDF for workshop use. The catalog covers the full Yanmar 4TNE88-3BY and 3CY parts lists in a single 37-page PDF.
Document Quality
This document is a scanned PDF with an OCR layer, allowing you to search and copy the full text. The text quality is generally clear and readable, though some original scanned portions show slight fading. Diagrams and illustrations are raster images, but they are clear and their labels are easily readable. Pages are clean with minimal scan artifacts, such as slight skewing on a few pages, but nothing that hinders readability. There are no notable blank or filler pages.
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