Part of the Yanmar Parts Manuals.
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 | Gear Housing Assy, Oil Seal, Lub. Oil Supply Cap, Gears Housing Flange, Hydraulic Oil Pump Cover, Hydraulic Oil Pump Gasket, Gasket, Knock Pipe |
| Gear Housing | 5-6 | Flywheel Housing, Flywheel Cover Cap, Lub. Oil Sump Assy, Lub. Oil Sump Spacer, Oil Seal Case Assy, Oil Seal |
| Flywheel Housing & Lub. Oil Sump | 7-8 | Cylinder Head Assy, Suction Valve, Exhaust Valve, Valve Spring, Spring Retainer, Valve Stem Seal, Valve Cap, Rocker Support Assy |
| Cylinder Head & Bonnet | 9-10 | Suction Manifold Gasket, Gasket, Suction Manifold, Exhaust Manifold, Exhaust Manifold Gasket, Air Heater, Air Heater Gasket |
| Suction & Exhaust Manifold | 11-12 | Camshaft Assy, Camshaft Gear, Thrust Bearing, Tappet, Push Rod, Idle Gear Shaft, Gear w/ Bush, Idle Gear Bush |
| Camshaft & Driving Gear | 13-14 | Crankshaft Assy, Crankshaft Gear, Crankshaft V-pulley, Flywheel w/ Gear, Flywheel w/ Ring Gear, Ring Gear, Piston w/ Rings, Ring Set |
| Crankshaft & Piston | 15-16 | Lub. Oil Pump Gasket, Oil Strainer Gasket, Gasket, Oil Inlet Pipe Assy, Strainer Bracket, Bracket Gasket, Filter 90X80L, Lub. Oil Pipe Assy |
| Lub. Oil System | 17-18 | Cooling Water Pump Assy, Cooling Water Pump Gasket, V-belt, Cooling Water Pump V-pulley, Fan D310, Thermo.cover Gasket, Gasket, Thermostat Gasket |
| Cooling Water System | 19-20 | Fuel Injection Pump Gear, Fuel I Pump Assy, Camshaft, Thrust Ball Bearing, Bearing Retainer, Plunger w/ Barrel, Retainer A, Plunger Spring Shoe |
| Fuel Injection Pump | 21-22 | Fuel Injection Valve Assy, Fuel Injection Nozzle Assy, Nozzle Holder Assy, Nozzle Spring, Nozzle Spring Seat, Stop Plate, Injection Pipe Retainer, Fuel Injection Pipe |
| Fuel Injection Device | 23-24 | Pipe Joint, Gasket, Fuel Pipe, Fuel Return Pipe, Joint, Cap, Check Valve Assy, Round Gasket |
| Fuel Line | 25-27 | Governor Case Gasket, Governor Case Cover, Case Cover Gasket, Link, Governor Weight Assy, Sleeve, Control Shaft Assy, Shaft Spacer |
| Governor | 28-29 | Stop Motor Assy, Stop Motor Spring, Snap Ring, Stop Motor Bracket |
| Engine Stop | 30-31 | Starter, Cover, Retainer, Clutch Kit, Pinion, Shaft, Ring, Coil Spring |
| Starting Motor | 32-33 | Generator, Rotor Assy, Bearing Cover, Drive Flame Assy, Plate, Rear Flame Assy, Cover, Crankshaft Pulley |
| Generator | 34-35 | Flex Horn, Gasket Set, Cylinder Head Gasket, Hydraulic Oil Pump Gasket, Bonnet Gasket, Valve Stem Seal, Nozzle Protector, Nozzle Seat |
| 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.
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