The Yanmar 3TNE78A is a 1.2 L 3-cylinder diesel / 4-stroke engine rated at 1800 rpm, producing up to 16.2 kW. It powers generator sets from Mase, including the IS9.5.
Also known as: Yanmar 3TNE78A
Part of the Yanmar 3TNE78A engine family — 2 variants share parts & fitment.
The cheapest captured merchant offer per filter — see the full cross-reference below for every OEM/aftermarket option.
Prices captured from merchant listings; some links are affiliate links. Verify against your serial number before ordering.
| Displacement | 1.204 L |
|---|---|
| Cylinders | 3 |
| Aspiration | Diesel / 4-stroke |
| Rated speed | 1800 rpm |
| Gross power | 16 kW |
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | ||||
| Fuel filter | 2.3' | 11981055650 | Amazon Amazon eBay $10.99 eBay $17.99 KuduParts $11.00 | ||
| Oil filter | 51334 | Amazon eBay $58.50 PartsGeek $7.98 NAPA $9.09 FridayParts $20.19 | |||
| Battery | 70Ah - 12V | — | |||
| Belt | — | ||||
| Coolant | — | ||||
| Oil | 5.5 qt. | 5.5 qt. | — | ||
| Spark plug | — |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
| Part # | Description | Category |
|---|---|---|
| 129619-12510 | Outer Element | Air filter |
| 129619-12520 | Housing | Air filter |
| 24-27302 | Element | Air filter |
| 171301-77201 | Alternator (includes Keys #6 - #18) | Alternator |
| 119660-77710 | Voltage Regulator | Avr |
| 119831-42290 | Drive Belt | Belt |
| 6-1001 | Control panel | Control panel |
| 119810-55650 | Element | Fuel filter |
| 121254-55510 | Strainer Cup | Fuel filter |
| 129100-55650 | Fuel Element | Fuel filter |
| 24-50012 | Primary fuel filter element | Fuel filter |
| 24-57600 | Fuel Filter Assembly | Fuel filter |
| 24-S50002 | Primary fuel filter / water separator - complete unit | Fuel filter |
| 104200-59170 | Gasket | Gasket |
| 119813-12110 | Intake Manifold Gasket | Gasket |
| 119813-13110 | Exhaust Manifold Gasket | Gasket |
| 119818-01330 | Cylinder Head Gasket | Gasket |
| 119865-11310 | Bonnet Gasket | Gasket |
| 121000-13201 | Gasket Manifold to Muffler | Gasket |
| 124240-01883 | Gasket | Gasket |
| 124465-44950 | Gasket | Gasket |
| 129150-32020 | Lubricating Oil Pump Gasket | Gasket |
| 129150-35041 | Gasket | Gasket |
| 129150-35111 | Gasket | Gasket |
| 129150-42020 | Cooling Water Pump Gasket | Gasket |
| 129150-49811 | Gasket | Gasket |
| 129150-77511 | Gasket | Gasket |
| 129155-52020 | Gasket | Gasket |
| 129795-49551 | Gasket | Gasket |
| 23414-100000 | Round Gasket 10 | Gasket |
| 719989-92600 | Gasket Set (Includes Keys #2 - #27) | Gasket |
| 977770-01212 | Liquid Gasket | Gasket |
| 119820-44560 | Hose, Radiator Inlet | Hose |
| 129619-12210 | Hose | Hose |
| 171301-49010 | Hose, Radiator Inlet | Hose |
| 171301-49020 | Hose, Radiator Outlet | Hose |
| 41-01012 | Hose 5/16" ID | Hose |
| 119625-11871 | Nozzle Protector | Injector |
| 119625-11880 | Nozzle Seat | Injector |
| 119818-53000 | Nozzle Assembly | Injector |
| 719800-53100 | Fuel Injector (includes Keys #18 - #25) | Injector |
| 24-07301 | Filter | Oil filter |
| 119285-77950 | Stop Solenoid 12 Volt (Yanmar) | Service part / kit |
| 119653-77950 | Stop Solenoid 12 Volt (Synchrostart) | Service part / kit |
| 22-40018 | Circuit Breaker 10 Amp | Service part / kit |
| 22-42047 | Relay, 12 Volt SPDT | Service part / kit |
| 119810-42001 | Coolant Pump (Parts not available separately) | Pump |
| 129001-32001 | Oil Pump Assembly (Parts not available separately) | Pump |
| 129100-52100 | Fuel Feed Pump | Pump |
| 719989-51310 | Injection Pump | Pump |
| 102103-55520 | O-Ring | Seal |
| 119810-01780 | Oil Seal | Seal |
| 121850-51960 | O-Ring | Seal |
| 124160-11340 | SEAL, VALVE STEM | Seal |
| 124950-11340 | SEAL, VALVE STEM | Seal |
| 129129-77350 | O-Ring | Seal |
| 129150-42320 | O-Ring | Seal |
| 129795-01800 | Oil Seal | Seal |
| 15-01001 | Sealing Washer | Seal |
| 22190-080002 | Seal Washer | Seal |
| 22190-220002 | Seal Washer 22S | Seal |
| 24311-000120 | O-Ring, 1A P-12.0 | Seal |
| 24311-000160 | O-Ring, 1A P-16.0 | Seal |
| 24311-000320 | O-RING, 1AP32.0 | Seal |
| 24311-240100 | O-Ring | Seal |
| 24341-000240 | O-Ring | Seal |
| 24341-000280 | O-Ring | Seal |
| 24341-000500 | O-Ring, 1A S-50.0 | Seal |
| 719810-01650 | Rear Main Seal Assembly (Includes Key #15) | Seal |
| 119600-34800 | Oil Pressure Switch | Sensor |
| 121250-44901 | Temperature Switch 110°C | Sensor |
| 121460-39450 | Pressure Switch | Sensor |
| 22-41016 | Oil Pressure Sender | Sensor |
| 22-45201 | Temperature Sender 250°F Standard Ground | Sensor |
| 129129-77010 | Starter Assembly (Includes all Keys) | Starter |
| 129698-77010 | Starter (Formerly #129129-77010. See parts detail) | Starter |
| 129155-49800 | Thermostat | Thermostat |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.
Parts listed by aftermarket suppliers as fitting this engine — leads compiled from supplier catalogs; verify the exact part for your serial number.
Cross-referenced via Donaldson + OEM/engine-maker interchange — options to verify against your serial number, not confirmed for every exact variant.
Other equipment known to use this engine, via filter-application cross-reference — useful for sourcing parts even when your exact machine isn't listed elsewhere on this page.
The Yanmar 3TNE78A has a displacement of 1.204 liters with 3 cylinders.
The Yanmar 3TNE78A powers 1 generator set(s), including Mase IS9.5.
The Yanmar 3TNE78A uses oil filter part numbers Yanmar 11900535170, Yanmar 12915035170, Donaldson P502051.
The Yanmar 3TNE78A uses fuel filter part numbers Yanmar 11981055650, Donaldson P502166, Wix 33263.
The Yanmar 3TNE78A uses air filter part numbers Yanmar 12908712510, Yanmar 11965512560L, Yanmar 12905112530.