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 Yanmar 4TNV88-BPTB1 (TB250) 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 |
Yanmar 4TNV88-BPTB1 (TB250) Common Problems This Manual Covers
Yanmar 4TNV88 cylinder head valve and rocker arm part numbers unclear when selecting components for cylinder rebuild p. 12
Check the cylinder head exploded view on page 12 to identify component positions, then match part numbers in the list on page 13. Valves, rocker arms, gaskets, and O-rings are each itemized with unique part numbers. The tapping screws in this assembly are 5x10mm; confirm fastener part numbers match before ordering to avoid incomplete kits.
Manual Section: Cylinder Head & BonnetPushrod and tappet part numbers for the camshaft assembly hard to locate from the exploded diagram p. 18
Open the Camshaft & Driving Gear diagram on page 18. Pushrods (listed as 'Rod') and tappets carry individual position numbers in the exploded view. Order pushrods by position callout, not just quantity. If the cylinder is also getting new pistons, note that oversize piston kits are available at 0.25mm (page 21), so coordinate part numbers across both sections.
Manual Section: Camshaft & Driving GearPiston ring set and connecting rod part numbers needed for rebuild, oversize availability and piston pin specs unclear p. 20
Turn to the Crankshaft & Piston diagram on page 20. Pistons, ring sets, and connecting rods each carry separate part numbers. Oversize pistons with rings are available at 0.25mm (page 21). The piston pin is 26mm diameter x 70mm length; verify the pin part number on page 21 against your serial number range before ordering.
Manual Section: Crankshaft & PistonCooling system fan belt part number and size unknown when replacing drive components before season p. 24
Open the Cooling Water System diagram on page 24. Fan, pump assembly, and belt components are listed with individual part numbers. The drive belt is type A38 (page 25). Cross-reference the subtank, thermostat, and cock assembly part numbers on the same page if ordering a full cooling system maintenance kit.
Manual Section: Cooling Water SystemHead gasket and valve stem seal part numbers for full engine rebuild unclear across multiple catalog sections p. 38
Turn to pages 38-42 for the complete Gasket SET(NON-ASB.) breakdown. Part numbers for the cylinder head gasket, F.I. pump seals, valve stem seals, and O-rings are indexed on page 40. Cross-reference with the cylinder head parts list on page 13 to confirm the 6x12mm spring pin and O-ring part numbers match your assembly before ordering.
Manual Section: Gasket SetFrequently Asked Questions
What are the replacement specifications for Pushrods?
The replacement part number for the pushrod is Y129150-14400, and 8 units are required for replacement. This part is listed under the Camshaft & Driving Gear section.
What are the replacement specifications for Valves?
For replacement, the intake valve part number is Y129005-11100 (4 units required), and the exhaust valve part number is Y129100-11112 (4 units required). These parts are found in the Cylinder Head & Bonnet section.
How do you fix yanmar 4TNV88 cylinder head valve and rocker arm part numbers unclear when selecting components for cylinder rebuild?
Check the cylinder head exploded view on page 12 to identify component positions, then match part numbers in the list on page 13. Valves, rocker arms, gaskets, and O-rings are each itemized with unique part numbers. The tapping screws in this assembly are 5x10mm; confirm fastener part numbers match before ordering to avoid incomplete kits.
How do you fix pushrod and tappet part numbers for the camshaft assembly hard to locate from the exploded diagram?
Open the Camshaft & Driving Gear diagram on page 18. Pushrods (listed as 'Rod') and tappets carry individual position numbers in the exploded view. Order pushrods by position callout, not just quantity. If the cylinder is also getting new pistons, note that oversize piston kits are available at 0.25mm (page 21), so coordinate part numbers across both sections.
How will I receive this Yanmar P-TB250EAC, 4TNV88-BPTB, 1, TB250 Parts Catalog?
Immediate download of the complete 42-page searchable Parts Catalog. Access it on any device, from a laptop at your desk to a phone in the field.
Can I print this manual?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
Document Quality
This document is a scanned PDF, not a native digital file. An OCR layer has been applied, allowing you to search and copy most of the text throughout the document. The text is generally readable, though not as crisp as a digitally created file, with some minor fuzziness on characters. Diagrams and illustrations are raster images; their labels are readable but are part of the image and not searchable. Pages are clean with no notable scan artifacts or marks, and there are some blank "Memo" pages included.
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