Part of the Yanmar Parts Manuals.
Need a reliable Yanmar 4TNV88-BPTB1 parts catalog PDF for your 4TNV88-BPTB engine? This 42-page OEM reference covers the complete TB250 powerplant from cylinder block to generator. Inside: exploded-view diagrams for every engine assembly, from crankshaft and piston through fuel injection pump, governor, and gasket sets. Every figure pairs with a numbered parts list carrying official OEM part numbers for the cylinder block, gear housing, flywheel, camshaft, lubrication system, cooling system, starting motor, and alternator. Order with confidence: the piston assembly calls out a D26 x L70 piston pin with 0.25mm undersize availability, and the cooling system specifies an A38 V-belt. Stop cross-referencing dealer microfiche one part at a time. Bookmarked and searchable, this PDF opens to any assembly in seconds on your laptop, tablet, or phone.
What's Inside This Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 6-7 | Block Assy, Plug, Bolt, Bush, Metal, Gasket |
| Gear Housing | 8-9 | Gear Case Assy, Seal, Flange, Stud, Cover, O-Ring |
| Flywheel Housing & Oil Sump | 10-11 | Housing, Flywheel, Cap, Bolt, Spacer, Sump Assy, Oil Seal |
| Cylinder Head & Bonnet | 12-13 | Head Assy, Bonnet Assy, Valve, Rocker Arm, Gasket, O-Ring |
| Suction Manifold & Air Cleaner | 14-15 | Manifold, Air Cleaner, Gasket, Clamp, Element, Valve |
| Exhaust Manifold & Silencer | 16-17 | Manifold, Silencer, Gasket, Bolt, Nut, Clamp |
| Camshaft & Driving Gear | 18-19 | Camshaft Assy, Driving Gear, Tappet, Rod, Metal, Bolt |
| Crankshaft & Piston | 20-21 | Crankshaft Assy, Piston Assy, Connecting Rod, Flywheel, Gear, Ring Set |
| Lub.Oil System | 22-23 | Pump Assy, Lub. Oil, Dipstick, Cooler Assy, Oil, Filter, Pipe |
| Cooling Water System | 24-25 | Pump Assy, Water, Thermostat, Fan, Cooling, Subtank, Cock Assy |
| Fuel Injection Pump | 26-27 | Injection Pump Assy, Valve Assy, Dilevery, Timer Set, Piston, Pump Assy, Feed |
| Governor | 28-29 | Packing, Case, Lever, Regulator, Retainer, Shaft, Solenoid, Stop |
| Fuel Injection Valve | 30-31 | Fuel Injector, Nozzle Assy, Holder Assy, Nozzle, Pipe Assy, Injection, Return |
| Fuel Line | 32-33 | Bracket, Fuel Filter, Filter, Fuel Oil, Pipe, Fuel Pump, Separator Assy |
| Starting Motor | 34-35 | Starter, Shaft, Pinion, Armature Assy, Coil Assy, Field, Housing Assy, Gear |
| Generator | 36-37 | Alternator, Rotor Assy, Bearing, Ball, Flame Assy, Drive, Regulator Assy, Adjuster |
| Gasket Set | 38-42 | Gasket SET(NON-ASB.), Gasket, CYL.HEAD, O-Ring, F.I.PUMP, Seal, Valve Stem |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Piston Pin dimensions | D26, L70 | p. 21 |
| Piston Metal Pin Undersize | 0.25 | p. 21 |
| V-Belt Type/Size | A38 | p. 25 |
| Spring Pin Dimensions | 6x12mm | p. 13 |
| Tapping Screw Size | 5x10mm | p. 13 |
