Part of the Yanmar Parts Manuals.
A crankshaft that needs 0.25 undersize main bearings will not forgive a guessed part number, and the whole point of the 46 pages in this Yanmar parts catalog, factory publication Y00B3322, is that you never have to guess. Each section breaks an assembly into numbered parts, from the governor rack and pinion through the starter, generator, magnetic relay and the full gasket set.
It covers the 4TN78TL, 4TN78TL(YB401W), 4TNA78TL-DBWVM, 4TNA78TL-RBW and 4TN78TLL-DBWVM diesels, wherever yours happens to be installed, and bookmarked sections take you straight to the system you have on the bench.
An engine in pieces earns nothing while a wrong part rides back to the supplier. With the catalog open beside the teardown you match each worn piece to its listing, order once, and put the engine back together on your schedule instead of a parts counter's.
What's Inside This Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Governor | 33-34 | Lever Bracket, Joint Retainer, Circlip, Pin |
| Control Lever Bracket | 35-36 | Starter, Pinion Stopper Set, Pinion Stopper Clip, Field Coil Assy, Pore Core Screw Set, Brush, Rear Cover Assy, Rear Cover Metal |
| Starting Motor | 37-38 | Generator, Rotor Assy, Spacer, Stator Assy, Rear Cover Assy, Regulator Brush Assy, Brush Assy, Regulator Assy |
| Generator | 39-40 | Earth Cord, Cord, Magnetic Relay, Bolt |
| Magnetic Relay | 41-42 | Dust Filter, Air Cleaner Assy, Outer Element, Cleaner Body, Air Cleaner Cup, Baffle, Inner Element, Unloader Valve |
| Tropics & Desert Type | 43-44 | Gasket Set, Cylinder Head Gasket, Hydraulic Oil Pump Gasket, Oil Seal Case Gasket, Bonnet Gasket, Suction Manifold Gasket, Exhaust Manifold Gasket, RHB31 Turbo Gasket |
| Gasket Set & Tool | 45-46 | Gasket Set, Gasket, Cyl. Head, O-Ring, HYD.OIL Pump, SUC.MANIFOLD |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main Bearing Undersize | 0.25 U.S. | p. 2 |
| Bearing Pin Undersize | 0.25 U.S. | p. 16 |
| Piston Ring Set Oversize | 0.25 | p. 16 |
| V-Belt Type | A-38 | p. 22 |
| Ball Bearing Size | 13/32 | p. 18 |
| Wire Diameter | 0.6 | p. 32 |
| Governor Link Length (Mark 05) | 30.5 | p. 31 |
