Locating the right replacement components is the only goal of this 37-page Yanmar 3TNC78L-RKAH Parts Catalog PDF (OEM #Y00B4192) covering your complete diesel engine. You get highly detailed exploded views of the entire cylinder block, gear housing, and fuel injection pump to guarantee you order the correct replacements. Open up the fuel line and governor sections to find complex assemblies broken down with precise factory part numbers and component descriptions. Confirm you are sourcing an exact A-39 V-belt for the cooling water pump or verify the 0.25U.S. oversize main bearing before calling the parts counter. Ordering the wrong engine component wastes a week of shop downtime. Download this bookmarked file right to your tablet, click directly to the exact system, and get your parts order right the first time.
What's Inside This Yanmar 3TNC78L-RKAH (V2), 3TNC78L-RKAH Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 3-4 | Cylinder, Plug, Bolt, Main Bearing, Thrust Bearing, Camshaft Bush |
| Gear Housing | 5-6 | Oil Seal, Lub. Oil Supply Cap, Gears Housing Flange, Cover, O-Ring |
| Flywheel Housing & Lub. Oil Sump | 7-8 | Flywheel Housing, Flywheel Cover, Lub. Oil Sump, Oil Seal Case, Oil Seal, O-Ring |
| Cylinder Head & Bonnet | 9-10 | Cylinder Head, Valve, Valve Spring, Rocker Arm Assy, Nozzle Protector, Bonnet Assy |
| Suction & Exhaust Manifold | 11-12 | Suction Manifold, Exhaust Manifold, Manifold Gasket, Air Heater, Bolt, Stud |
| Camshaft & Driving Gear | 13-14 | Camshaft, Camshaft Gear, Thrust Bearing, Tappet, Push Rod, Idle Gear |
| Crankshaft & Piston | 15-16 | Crankshaft, Crankshaft Gear, V-Pulley, Flywheel, Piston, Connecting Rod, Crankpin Bearing |
| Lub. Oil System | 17-18 | L.O. Pump, Oil Strainer, Oil Inlet Pipe, Oil Filter, Oil Pressure Switch, Dipstick |
| Cooling Water System | 19-20 | Pump Assy, C. Water, V-Belt, Fan, Gasket, Thermostat |
| Fuel Injection Pump | 21-22 | Gear, Fuel Inj. Pump, Pump Assy, Fuel I., Plunger W/BARREL, Tappet Assy, Valve W/SEAT, Deliv. |
| Fuel Injection Device | 23-24 | Valve Assy, F.INJECT, Nozzle Assy, Holder Assy, Nozzle, Spring |
| Fuel Line | 25-27 | Bolt, Pipe Joint, Joint 12, Pipe, Clamp 8, Fuel |
| Governor | 28-29 | Gasket, Gov. Case, Link, Weight Assy, Gov., Shaft Assy, Control, Lever Assy |
| Engine Stop | 30-31 | Motor Assy, Stop, Spring, Stop Motor, Ring, Snap, Bracket |
| Starting Motor | 32-33 | Starter, Clutch Kit, Pinion, Yoke Assy, Housing Assy, Brush |
| Generator | 34-35 | Rotor Assy, Ball Bearing, Flame Assy, Drive, Pulley, Crankshaft, Regulator Assy |
| Tool & Gasket Set | 36-37 | Gasket, Cyl. Head, Suc. Manifold, Exh. Manifold, O-Ring, F.I. Pump |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main Bearing Oversize | 0.25U.S | p. 2 |
| Crankpin Bearing Oversize | 0.25U.S | p. 14 |
| Piston w/Ring Oversize | 0.25 | p. 14 |
| Ring Set Oversize | 0.25 | p. 14 |
| V-Belt Type/Size | A-39 | p. 18 |
| Link Length (Mark 0) | 30 | p. 26 |
| Link Length (Mark 1) | 31 | p. 26 |
| Link Length (Mark 05) | 30.5 | p. 26 |
Yanmar 3TNC78L-RKAH (V2), 3TNC78L-RKAH Common Problems This Manual Covers
Yanmar 3TNC78L-RKAH engine shuts down with P1212/3 code and binding fuel rack actuator p. 26
Check the fuel line linkage exploded view on page 25. Verify the correct replacement based on the stamped mark. If you need Link Length (Mark 0), the spec on page 26 is 30. Order the exact matching link to prevent mechanical binding.
Manual Section: Fuel LineNeed the correct part numbers for oversized bottom end bearings after crankshaft machining p. 2
Review the engine parts diagram on page 3 to identify the main bearings. Select the 0.25U.S Main Bearing Oversize part number detailed on page 2. Cross-reference this specific number with your block casting before ordering the replacement bearing set for the rebuild.
Manual Section: Cylinder BlockExcessive blow-by and oil consumption requiring a lower end rebuild and new bearings p. 14
Check the camshaft and driving gear section for related components. Identify the correct Crankpin Bearing Oversize 0.25U.S components listed on page 14. Order the matched oversized bearing part numbers for your specific crankshaft requirements to restore factory clearances.
Manual Section: Camshaft & Driving GearFrequently Asked Questions
What are the replacement specifications for fuel injection pump?
The replacement specification for the fuel injection pump is identified by part number 719869-51360. This is for the "PUMP ASSY, FUEL I." as listed in the manual.
How do you fix yanmar 3TNC78L-RKAH engine shuts down with P1212/3 code and binding fuel rack actuator?
Check the fuel line linkage exploded view on page 25. Verify the correct replacement based on the stamped mark. If you need Link Length (Mark 0), the spec on page 26 is 30. Order the exact matching link to prevent mechanical binding.
How do you fix need the correct part numbers for oversized bottom end bearings after crankshaft machining?
Review the engine parts diagram on page 3 to identify the main bearings. Select the 0.25U.S Main Bearing Oversize part number detailed on page 2. Cross-reference this specific number with your block casting before ordering the replacement bearing set for the rebuild.
How do you fix excessive blow-by and oil consumption requiring a lower end rebuild and new bearings?
Check the camshaft and driving gear section for related components. Identify the correct Crankpin Bearing Oversize 0.25U.S components listed on page 14. Order the matched oversized bearing part numbers for your specific crankshaft requirements to restore factory clearances.
Is this Yanmar 3TNC78L-RKAH (V2), 3TNC78L-RKAH Parts Catalog a digital download?
Instant PDF download. You get the full 37-page searchable Parts Catalog immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Am I able to print pages from this Yanmar 3TNC78L-RKAH (V2), 3TNC78L-RKAH?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Document Quality
This document is a high-quality scanned PDF with an accurate OCR text layer, allowing you to search and copy text from every page. All text, including part descriptions and diagram labels, is crisp and easy to read. The diagrams and illustrations are clear raster images, with all numbers and labels perfectly legible. Pages are consistently clean, free of scan artifacts, and there are no blank or filler pages.
Reviews
There are no reviews yet.