Part of the Yanmar Parts Manuals.
A crankshaft going back into its block on journals ground 0.25 undersize is only as reliable as the bearing number ordered against it, and guessing that number from a lookalike engine is how a fresh rebuild spins a shell in its first hour. These 49 pages exist to stop that: the Yanmar parts catalog for the 3TN84L-RBB diesel, publication Y00B4421, covering the engine from cylinder block to suction and exhaust manifold.
Seven sections break the engine into its assemblies: Cylinder Block, Gear Housing, Flywheel Housing, Lub.Oil Sump, Bonnet, Cylinder Head, and Suction & Exhaust Manifold. Each lists the seals, gaskets, bearings, bushes and hardware by Yanmar part number, so whether this engine sits in a tractor, a genset, or on a stand, you order once and order right.
The PDF is 0.7 MB, downloads immediately, and prints clean, so the pages can sit on the bench beside the parts they name.
What's Inside This Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 3-4 | Plug PT1/4, Bolt, Bearing Cap, Main Bearing, Bearing, Thrust, Bush, Camshaft |
| Gear Housing | 5-6 | Seal, Oil, Stud M 8X 22, Cap, LUB.OIL Supply, Flange, Gears Housing, Gasket |
| Flywheel Housing | 7-8 | Parallel Pin 8X16, Housing, Flywheel, Cap, Flywheel Cover, Case Assy, Oil Seal, Seal |
| Lub.Oil Sump | 9-10 | Sump Assy, Lub Oil, Cover, Oil Sump, Plug M16, Seal Washer 16S, Bolt M |
| Bonnet | 11-12 | |
| Cylinder Head | 13-14 | |
| Suction & Exhaust Manifold | 15-49 |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main Bearing Undersize | 0.25 | p. 2 |
| Thrust Bearing Undersize | 0.25 | p. 2 |
| O-RING 1A P-16.0 | 16.0 | p. 4 |
| O-RING 1A P-32.0 | 32.0 | p. 4 |
| O-RING 1A P-26.0 | 26.0 | p. 4 |
| O-RING 1A S-24.0 | 24.0 | p. 4 |
| O-RING 1A P-32.0 (Bonnet) | 32.0 | p. 10 |
| O-RING 1A S-50.0 | 50.0 | p. 10 |
| O-RING 1A P 12.0 | 12.0 | p. 10 |
| V-BELT (A-38) | 38 | p. 26 |
| V-PULLEY Diameter | 110 | p. 26 |
| O-RING 1A G-65.0 | 65.0 | p. 37 |
