Tools & supplies
- Socket set and ratchet (verify drain plug socket size on vehicle)
- Torque wrench (0–100 Nm range)
- Oil filter wrench (cup/cap type or strap wrench sized for the N04C filter)
- Oil drain pan (capable of ≥10–12 L)
- Funnel and clean rag(s)
- Gloves and safety glasses
- Jack and stands or wheel chocks (if needed to access filter)
- New engine oil (grade to OEM spec — see Hino manual; diesel CI-4/CH-4 or manufacturer recommended 10W‑30 / 15W‑40)
- New oil filter (OEM part for Hino N04C / correct aftermarket equivalent)
- New crush washer for drain plug (recommended)
- Small brush or paper towel for sealing surfaces
- Waste-oil container for disposal

Safety precautions
- Work on a level surface. Engage parking brake and chock wheels.
- Let engine cool until warm (not scalding) — warm oil drains faster; avoid working on a hot engine without protection.
- Wear gloves and eye protection. Avoid skin contact with used oil.
- Support the vehicle securely if lifted. Never rely only on a jack.
- Dispose of used oil and filter per local regulations.

Step-by-step procedure
1. Preparation
- Park on level ground, chock wheels and set parking brake.
- Run the engine a few minutes to bring oil to warm temperature (not red hot). Switch off engine.
- Remove oil filler cap to vent the system and allow faster drain.

2. Position the drain pan
- Slide the drain pan under the oil sump/drain plug, allow clearance to remove plug and filter.

3. Remove drain plug and drain oil
- Using the correct socket, loosen the drain plug. Turn slowly: oil will flow immediately once loose.
- Remove plug by hand after initial loosen and allow oil to drain completely (5–10 minutes depending on temp).
- Remove and replace the crush washer on the drain plug. Clean mating surfaces before reinstallation.

4. Remove oil filter
- Locate the spin-on oil filter (or cartridge housing depending on engine variation). Position the drain pan beneath it.
- Use the oil filter wrench: a cap/cup wrench that fits the filter end is preferred — engage it squarely and turn counterclockwise. If using a strap wrench, wrap the strap fully and pull steady.
- Break the filter loose and remove by hand. Expect additional oil to pour from the filter; tip it into the drain pan.

How the oil filter wrench is used
- Cap/cup wrench: select the cup size that fits the filter’s hex/profile. Seat it fully over the filter end, attach ratchet and break torque with steady force — avoid slipping. Once broken free, remove the wrench and finish by hand.
- Strap wrench: wrap strap so it has full contact around filter. Apply steady turning force; strap grips and turns the filter. Strap wrenches are good when space is limited.
- Pliers-style filter tools can deform the canister; use only if other tools can’t reach.

5. Prep and install new filter
- Compare new filter to old to confirm correct model.
- Lubricate the new filter’s rubber gasket with clean engine oil (a light coat).
- If the filter is a full-flow spin-on, you can pre-fill it with oil if the orientation allows — this reduces dry-start wear (if tight access prevents pre-fill, it’s still acceptable).
- Thread the new filter by hand onto the housing until gasket contacts the seat. Then tighten per filter tightening method: typically hand-tight plus 3/4 turn (or follow the filter manufacturer/Hino spec). If using torque, follow the workshop manual torque for filter housing cap if applicable. Do not overtighten.

6. Reinstall drain plug
- Clean and inspect the drain plug and oil pan threads. Fit the new crush washer.
- Reinstall the drain plug and tighten by torque wrench to the specified torque in workshop manual. Typical range for many Hino diesel drain plugs is approx. 30–50 Nm — verify exact value in the manual.

7. Refill engine oil
- Reinstall oil filler cap removed earlier.
- Refill with the recommended oil type and quantity per the Hino N04C specification. Fill gradually and check level with dipstick. Do NOT overfill.
- Typical warm-up and recheck sequence: fill to ~80% then proceed to next step.

8. Check for leaks and final level
- Start engine and run at idle for 1–2 minutes. Watch for leaks around filter and drain plug.
- Shut engine off, wait 2–3 minutes for oil to settle, then check dipstick and top up to correct level.
- Proper final oil level is at the full mark on the dipstick per manual instructions.

9. Clean up and disposal
- Wipe spills from engine and chassis. Securely cap used oil container and filter for proper recycling.
- Reset service indicator if vehicle has one (follow truck’s service procedure).

Replacement parts required
- New oil filter (OEM or approved aftermarket for Hino N04C)
- Engine oil to OEM spec (type and capacity per manual)
- Drain plug crush washer (recommended)
- Possible O-rings or gasket for filter housing (if using cartridge or housing cap — inspect and replace if worn)

Common pitfalls and how to avoid them
- Cross‑threading the filter: always start by hand and keep the filter perpendicular to the housing.
- Overtightening the filter: hand-tight plus ~3/4 turn or manufacturer torque; overtightening damages gasket and makes future removal hard.
- Forgetting to replace crush washer: leads to leaks at drain plug.
- Not priming filter / dry start: pre-fill spin-on filter when possible or crank engine briefly without load to build oil pressure.
- Using wrong oil or wrong filter: verify part numbers and viscosity for the operating climate and engine spec.
- Not checking for leaks after startup: always inspect filter and drain plug immediately.
- Loose drain plug or over-torqued threads: torque to spec and replace plug or pan if threads damaged.
- Environmental spills: position drip pan correctly and use absorbent mats; clean spills promptly.

Final notes
- Always follow the exact torque values, oil grade, and oil capacity specified in the Hino N04C workshop manual for your model/year.
- If the filter location or housing is a cartridge type (some N04C variants), the procedure is the same conceptually but will require removal of the housing cap (use correct cap socket and torque on reassembly) and replacement of the internal filter element and housing O-ring/gasket.

End.
rteeqp73

NO4C engine for hino

HINO NO4C HYBRID KO BOX ECU Wiring Training

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