All 104 pages of this Yanmar 3TNV82A/84(T)/88, 4TNV84(T)/88, MP Series Service Manual PDF (OEM #0BMP0-U00100) focus directly on servicing the fuel injection systems for your industrial engines, including the 4TNV94/98(T)106(T) and MP2/MP4 variants. You get complete disassembly procedures for the governor and fuel injection pump, supported by crisp exploded views. Open the troubleshooting section to diagnose fuel delivery issues quickly, then use the detailed calibration steps to dial in the exact high idle and rated fuel delivery. Set the fuel injector opening pressure to 2843-2988 psi on your 3TNV82A, and lock down the nozzle case nut to 29-33 ft-lb before reinstalling. Stop burning time on internet guesswork. Download this bookmarked file straight to your tablet, tap the exact fuel pump chapter you need, and get that engine running right.
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 | 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 | 3133 - 3278 psi (21.6 - 22.6 MPa; 220 - 230 kgf/cm²) | p. 90 |
| 3MP2 | ||
| Dry Weight | 18.5 lb (8.4 kg) | p. 17 |
| 4MP4 | ||
| Dry Weight | 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
Yanmar 3TNV82A engine cranks normally but refuses to start after sitting idle over the weekend p. 101
Check the troubleshooting chart on page 101 for restricted flow. Disassemble and clean the fuel filter element. Bleed air from the lines and test the fuel injector opening pressure, which should measure 2843 - 2988 psi (19.6 - 20.6 MPa) as outlined on page 90.
Manual Section: TroubleshootingEngine fires up briefly but immediately stalls out under load or during normal operation p. 83
Inspect the calibration procedures on page 83 to ensure oil feed pressure reaches 2.8-4.3 psi (19.6 - 29.4 kPa). If pressure is stable, check the MP2 or MP4 delivery valve holder. Torque the holder to 30 - 33 ft-lb (40 - 45 N·m) according to page 19.
Manual Section: AdjustmentRough idle and erratic throttle response when attempting to increase RPMs in cold weather p. 17
Remove the governor housing cover to inspect internal linkage. Measure the governor tension lever side clearance on page 17, ensuring it falls strictly between 0.001 - 0.002 in. (0.3 - 0.6 mm). For MP2 and MP4 models, verify the governor weight nut torque reaches 59 - 62 ft-lb (79 - 84 N·m) on page 21.
Manual Section: General Service InformationExcessive diesel fuel leaking from the injection nozzle area causing rough running and smoke p. 92
Clean the area around the injection nozzles and inspect for physical damage. Secure the fuel injector nozzle case nut to exactly 29 - 33 ft-lb (39 - 44 N·m) as specified on page 92. If leaks persist, disassemble the nozzle body to check for a broken delivery spring.
Manual Section: Fuel Injection NozzleFrequently Asked Questions
What is the tightening torque for the fuel inlet fitting on the MP2/MP4 fuel injection pump?
The tightening torque for the fuel inlet fitting on the MP2/MP4 fuel injection pump is 18 - 21 ft-lb (25 - 29 N·m). This specification is found in the Pump Torque Specifications table on page 18.
What are the torque specifications for the hydraulic head bolts during reassembly of the fuel injection pump?
When installing the hydraulic head assembly, the head bolts should be tightened to 13 - 16 ft-lb (18 - 22 N·m) for MP2 models and 21 - 24 ft-lb (28 - 32 N·m) for MP4 models, in a diagonal order. This procedure is outlined on page 72.
What is the tightening torque for the governor weight nut on MP2/MP4 models?
The governor weight nut on MP2/MP4 models should be tightened to 59 - 62 ft-lb (79 - 84 N·m). This specification is important for correct governor assembly and is listed in the Governor Torque Specifications table on page 21.
What is the tightening torque for the fuel injector nozzle case nut?
The fuel injector nozzle case nut should be tightened to 29 - 33 ft-lb (39 - 44 N·m; 4 - 5 kgf·m). This ensures proper assembly of the fuel injection nozzle, as specified in the Special Torque Chart on page 92.
What is the recommended oil capacity for the fuel injection pump?
The fuel injection pump should be filled with about 6.75 oz (200 cc) of pump oil or engine oil. This is done by removing the oil fill plug on the top of the governor case, as described in the Adjustment section on page 83.
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.
Document Quality
This document is a scanned PDF, but it includes an OCR layer, so you can search and copy the full text. The text quality is crisp and consistently easy to read across all pages. Diagrams and illustrations are mostly raster images or photos, but their labels are clear and legible. Pages are generally clean with minimal scan artifacts, and there are no significant stains or skewed pages. You will find several "This Page Intentionally Left Blank" pages throughout the manual.
Reviews
There are no reviews yet.