4 Pieces Nozzle Seat YM119625-11880 for Komatsu Engine 3D75N 3D78 3D84 4D98E S3D84E Excavator PC20R-8 PC75-1 PC95R-2 Loader CK20-1 WA85-3
This injector seal kit is engineered as a direct replacement for the Komatsu Engine 3D75N 3D78 3D84 4D98E S3D84E Excavator PC20R-8 PC75-1 PC95R-2 Loader CK20-1 WA85-3. Manufactured to meet or exceed OEM specifications, it delivers reliable performance in demanding conditions. Each unit is tested for fuel flow, pressure rating, and durability before leaving the factory to ensure consistent quality across every order.
Vehicle Compatibility
| Application | Details |
|---|---|
| Seat YM119625 | 11880 for |
| Komatsu Engine 3D75N 3D78 3D84 4D98E S3D84E Excavator PC20R | 8 PC75-1 PC95R-2 Loader CK20-1 WA85-3 Replacement Part Number: YM119625-11880, YM11962511880 Fit for |
| Komatsu Asphalt Roller: JV06H | 3, JV06HM-2, JV07HK-3, JV08H-2, JV08H-3, JV08HM-2 |
| Komatsu Excavator: PC110R | 1, PC20R-8, PC27R-8, PC35R-8, PC45R-8, PC75-1, PC75R-2, PC95R-2, PW110R-1, PW75-1, PW75R-2, PW95R-2 |
Replaces OEM Part Numbers
YM119625-11880 • YM11962511880 • Komatsu • Engine • 3D75-2C • 3D75-2D • 3D75N-1YC • 3D75N-2E • 3D78-1A • 3D78-1C • 3D78-1D • 3D78-1E
Signs You Need a Replacement
If your equipment is showing any of these symptoms, the injector seal kit may be the cause:
- Fuel leak at injector base — Copper washers lose their crush seal over time. If you see dampness around the injector, the seals need replacement.
- Fuel in coolant or oil — A failed combustion seal allows fuel pressure to escape into adjacent passages. This is a serious issue that requires immediate attention.
- Loss of compression on one cylinder — When the copper sealing washer fails, combustion gases blow past the injector body instead of pushing the piston.
Installation Notes
Clean the injector bore thoroughly before installing new seals. Any carbon or debris left in the bore prevents the copper washer from seating properly, causing a compression leak. Use a wire brush or bore cleaning tool, then wipe with a lint-free cloth. Install the seals in the order specified in the kit — the heat shield goes on first, then the copper washer, then the O-rings. Torque the injector to the specified value and recheck after running the engine under load.
Frequently Asked Questions
Will this fit my Komatsu PC20R-8?
Yes. This part is designed to fit the Komatsu PC20R-8, PC75-1, PC95R-2, CK20-1 among other models listed in the compatibility table above. Verify your specific model and engine code before ordering to ensure the correct fit.
Can I cross-reference YM119625-11880 with YM11962511880?
Yes. Both YM119625-11880 and YM11962511880 are interchangeable OEM numbers for this part. They refer to the same component with the same specifications, just different part number revisions.
How do I check if my engine code (PC20R, PC75, PC95R, CK20) matches?
The engine code is stamped on a metal tag attached to the engine block, usually near the timing belt cover or on the cylinder head. Compare the code you find with the list above. Engine codes are 3 to 6 characters long.
This listing is for 4 pieces – do I need to buy a full set?
This listing includes 4 units. For best results, replace all injectors at the same time rather than one at a time. Mixing old and new units causes uneven fuel delivery and shortens the life of the new parts.
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