Part of the Yanmar Parts Manuals.
All 37 pages of this Yanmar 4TNE88-B1, B50-2A Parts Catalog (OEM #Y00B5141) do one thing: give you the exact factory part number before you place an order or pick up the phone. Exploded-view diagrams walk you through every major assembly on this engine, from the cylinder block and crankshaft-piston group to the fuel injection pump with its plunger-and-barrel breakdown, the governor linkage, starting motor, and generator. Every diagram pairs OEM callouts with component identifiers so you can cross-reference what you pulled off the bench against what Yanmar actually calls it. Need the V-belt? It's an A-37. The drain plug runs M22 thread. Order the right parts the first time, not after a second trip to the counter. Bookmarked by system so you jump straight to Cooling Water or Fuel Injection Pipe without hunting. One download, search by keyword, done.
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
Yanmar 4TNE88 engine overheating and need the correct water pump and drive belt part numbers p. 20
Inspect the cooling water system parts diagram on page 20. Locate the correct water pump assembly for your serial number. Check the component list for the exact A-37 V-Belt required to drive the fan properly. Order matching replacement pipes and thermostats to prevent further overheating issues.
Manual Section: Cooling Water SystemStripped oil pan threads leaking fluid and need replacement plug and parallel pin part numbers p. 6
Check the flywheel housing and lubrication oil sump diagram on page 6. Find the exact replacement plug matching the required M22 drain plug thread size. Locate the corresponding 8x16 mm parallel pin in the parts list to ensure proper alignment during reassembly.
Manual Section: Flywheel Housing & Lub. Oil SumpFinding correct piston ring sets and bearing part numbers for heavy blow-by and excessive oil consumption p. 16
Review the crankshaft and piston exploded views on page 16. Identify the standard or oversize piston ring sets required for your specific block. Since you are rebuilding the bottom end, check page 6 to order a fresh M22 drain plug to complete the service properly.
Manual Section: Crankshaft & PistonHunting engine speed and need governor weight assembly and control shaft part numbers for unstable idle p. 29
Inspect the governor component breakdown on page 29. Locate the specific weight assembly and control shaft part numbers for your application. If replacing the entire case, cross-reference the 8x16 mm parallel pin found on page 6 to guarantee proper alignment against the engine block.
Manual Section: GovernorFrequently Asked Questions
What are the torque specs for the Yanmar 4TNE88-B1 cylinder head bolts?
The manual lists "STUD, CYL. HEAD" with part number 129150-01200 and a quantity of 18, but does not provide specific torque specifications for these bolts. Therefore, the exact torque specifications cannot be determined from the provided pages.
What is the torque specification for the Yanmar 4TNE88-B1 crankshaft bolt?
The manual lists a "BOLT, FLYWHEEL" with part number 121111-21501 and a quantity of 6, and a "BOLT, V-PULLEY" with part number 121850-21680. However, specific torque specifications for these crankshaft-related bolts are not provided in the manual.
What are the replacement specifications for complete gasket set?
The complete gasket set for the Yanmar 4TNE88-B1 is listed with part number 729430-92620. This set is optional and includes various gaskets for different engine components, as detailed on page 36.
What are the replacement specifications for cylinder head gasket?
The cylinder head gasket for the Yanmar 4TNE88-B1 is listed with part number 129407-01340. This gasket is a component of the cylinder head assembly, as indicated in the 'Cylinder Head & Bonnet' section.
How will I receive this Yanmar 4TNE88-B1, B50-2A, Y00B5141 Parts Catalog?
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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