Part of the Yanmar Repair Manuals.
The governor inside a Yanmar MP2 or MP4 fuel injection pump is the hardest job in this book: small weights, a tension lever clearance measured in thousandths, and no room for guesswork on reassembly. Yanmar service manual 0BMP0-U00100 was written for exactly that work, covering the MP series pumps fitted to 3TNV82A, 3TNV84(T), 3TNV88, 4TNV84(T), 4TNV88, 4TNV94, 4TNV98(T), and 4TNV106(T) industrial engines.
Across 104 pages it steps through governor disassembly and installation, fuel pump teardown and reassembly, bench adjustment of high idle, rated, and torque fuel delivery, and nozzle service with opening pressure specifications by engine model. Torque tables for MP2 and MP4 pumps mean parts go back to spec instead of by feel, and a fuel system troubleshooting chart closes the book.
It downloads as a bookmarked English PDF you can print or keep at the bench, whether the engine lives in a tractor, a genset, a boat, or on a stand.
What's Inside This Yanmar 3MP2 / 4MP2 / 4MP4 Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 5-6 | - |
| Safety | 7-12 | - |
| General Service Information | 13-28 | Fuel Injection Pump, Fuel Injection Pump Nameplate, Specifications, Measuring Instruments, Pump Torque Specifications (MP2 / MP4 Models) |
| Governor | 29-52 | Disassembly, Assembly, Installation |
| Fuel Injection Pump | 53-80 | Fuel Pump Disassembly, Fuel Pump Reassembly |
| Adjustment | 81-88 | Setup and Inspection, Component Identification, High Idle Fuel Delivery, Rated Fuel Delivery, Torque Fuel Delivery, Fuel Pump Timing Index Stamping Identification |
| Fuel Injection Nozzle | 89-98 | Specifications, Nozzle Body Identification Number, Special Service Tools, Operation, Disassembly, Reassembly |
| Troubleshooting | 99-104 | Fuel System Troubleshooting Chart |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Fuel filter element replacement | Disassemble and clean, or replace element | p. 101 |
| Governor Tension Lever Side Clearance | 0.001 - 0.002 in. (0.3 - 0.6 mm) | p. 17 |
| Oil Feed Pressure | 2.8-4.3 psi (19.6 - 29.4 kPa, 0.2 - 0.3 kgf/cm²) | p. 83 |
| Fuel Injector Nozzle Case Nut Torque | 29 - 33 ft-lb (39 - 44 N·m; 4 - 5 kgf·m) | p. 92 |
| 3TNV82A, 4TNV82A, 3TNV88, 4TNV88 (Model: CL, ID mark: W) | ||
| Fuel Injector Opening Pressure (3TNV82A, 4TNV82A, 3TNV88, 4TNV88 (Model: CL, ID mark: W)) | 2843 - 2988 psi (19.6 - 20.6 MPa; 200 - 210 kgf/cm²) | p. 90 |
| 3TNV84T, 4TNV84T, 4TNV94T, 4TNV98T, 4TNV106T (Model: CL, ID mark: V*) | ||
| Fuel Injector Opening Pressure (3TNV84T, 4TNV84T, 4TNV94T, 4TNV98T, 4TNV106T (Model: CL, ID mark: V*)) | 3133 - 3278 psi (21.6 - 22.6 MPa; 220 - 230 kgf/cm²) | p. 90 |
| 3MP2 | ||
| Dry Weight, 3MP2 | 18.5 lb (8.4 kg) | p. 17 |
| 4MP4 | ||
| Dry Weight, 4MP4 | 25.4 lb (11.5 kg) | p. 17 |
| MP2/MP4 | ||
| Delivery Valve Holder Torque | 30 - 33 ft-lb (40 - 45 N·m) | p. 19 |
| Governor Weight Nut Torque | 59 - 62 ft-lb (79 - 84 N·m) | p. 21 |
| MP2 | ||
| Plunger and Barrel Seal Plug Torque | 22 - 26 ft-lb (30 - 35 N·m) | p. 19 |
| Camshaft Drive Nut Torque | 58 - 65 ft-lb (78 - 88 N·m) | p. 19 |
Yanmar 3MP2 / 4MP2 / 4MP4 Common Problems This Manual Covers
Hard Starting After Storage or Service
An engine that cranks forever without firing usually has air in the lines, restricted filters, or weak fuel delivery. The Fuel System Troubleshooting Chart works symptom by symptom so you fix the cause instead of swapping parts on a hunch.
Manual Section: Troubleshooting p. 99Idle That Hunts or Surges
An idle that swings up and down often traces to worn governor components or an out-of-spec tension lever side clearance. The Governor section covers disassembly, assembly, and installation in order, with the clearance checks that separate a stable idle from a surging one.
Manual Section: Governor p. 29Low Power and Smoky Exhaust
Soft power under load with hazy exhaust points at nozzles opening late or dribbling. The Fuel Injection Nozzle section gives opening pressure specifications by engine model, the special service tools, and full disassembly and reassembly steps for testing and restoring pop pressure.
Manual Section: Fuel Injection Nozzle p. 89Fuel Leaks at the Injection Pump
Diesel weeping at delivery valve holders or seal plugs means a reseal, and every joint on these pumps carries a torque value. The Fuel Injection Pump section walks the complete teardown and reassembly so the seals go in right the first time.
Manual Section: Fuel Injection Pump p. 53Uneven Fuel Delivery Between Cylinders
When one cylinder runs lean and another rich, the pump needs its delivery set on the bench. The Adjustment section covers setup and inspection, high idle, rated, and torque fuel delivery, plus timing index stamping identification.
Manual Section: Adjustment p. 81Ordering the Wrong Pump or Nozzle Parts
Guessing at a pump variant costs you the wrong part, the wait, and sometimes a second teardown. General Service Information shows how to read the fuel injection pump nameplate, and the nozzle body identification number is decoded in the nozzle section, so the right number goes on the order the first time.
Manual Section: General Service Information p. 13Frequently Asked Questions
Which Yanmar engines does this manual apply to?
It covers the MP series (MP2 and MP4) fuel injection pumps used on Yanmar 3TNV82A, 3TNV84(T), 3TNV88, 4TNV84(T), 4TNV88, 4TNV94, 4TNV98(T), and 4TNV106(T) industrial engines, regardless of what equipment the engine is installed in.
Does it list injector opening pressures?
Yes. The Fuel Injection Nozzle section tables opening pressure by engine model and nozzle identification mark, for example 2843 to 2988 psi for standard 3TNV82A and 3TNV88 injectors, and gives the nozzle case nut torque of 29 to 33 ft-lb. p. 89
Are torque specifications for the pump included?
Yes. General Service Information carries torque tables for MP2 and MP4 pumps, including 30 to 33 ft-lb for the delivery valve holder and 59 to 62 ft-lb for the governor weight nut, along with specifications and the measuring instruments the work calls for. p. 13
Does it cover full engine rebuilds, like head bolt torque?
No. This book is the fuel system service manual: governor, fuel injection pump, fuel delivery adjustment, injection nozzles, and troubleshooting. Cylinder head torque, bearing clearances, and general rebuild procedures belong to the separate engine service manual for your TNV model.
Is this Service Manual a digital download?
You get a 104-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Am I able to print pages from 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.
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