The 2021 Isuzu NRR has 20 engine parts with verified fitment on this page — 9 part types and 7 brands, covering the 5.2L L4 DIESEL Turbocharged engine. Each part includes a manufacturer part number and application notes.
On the 2021 Isuzu NRR, the engine covers the internals and hard parts that build compression and keep oil where it belongs — gaskets, bearings, camshafts, lifters, seals and timing components. Most of the listed parts are Oil (5 parts), Oil Filter (3 parts) and Exhaust Valve (2 parts). The other 6 part types cover the remaining 10 parts.
Every part on this page is matched to the 5.2L L4 DIESEL Turbocharged — the only engine offered in the 2021 Isuzu NRR.
The most listed brands for 2021 Isuzu NRR engine parts are QUALCAST (10 parts), VALVOLINE (5 parts) and MOTORAD (1 part), plus 4 more brands. Quality grades include Standard Replacement, Economy and Heavy Duty / Diesel.
Each part number listed for the 2021 Isuzu NRR opens a page with every vehicle that part fits.
Exhaust Valve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| QUALCAST | 1013122 | 🇺🇸 US 🇨🇦 CA | 1.456 Head DIA. 0.312 Stem. N-Series Trucks. (Mexico ELF 400-600). OEM # 8972098763 | View on Amazon |
| QUALCAST | 1013464 | 🇺🇸 US 🇨🇦 CA | 1.456 Head DIA. 0.3120 Stem DIA. 5.520 OAL. OEM # 8981583761 | View on Amazon |
This table covers the exhaust valves that let combustion gas out of the cylinder. Typical signs include a circuit that will not hold, a whistle, or a code for this valve. A stuck valve is often debris. Clean the ports before installing the new one.
QUALCAST supplies both parts for the 2021 Isuzu NRR.
Listed part numbers: QUALCAST 1013122 and QUALCAST 1013464.
Intake Valve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| QUALCAST | 1013121 | 🇺🇸 US 🇨🇦 CA | 1.457 Head DIA. 0.313 Stem. N-Series Trucks. (Mexico ELF 400-600). OEM # 8943958822 | View on Amazon |
| QUALCAST | 1013463 | 🇺🇸 US 🇨🇦 CA | 1.457 Head DIA. 0.3130 Stem DIA. 5.530 OAL. OEM # 8980388700 | View on Amazon |
This table covers the intake valves that let air (and fuel, on port-injected engines) into the cylinder. Typical signs include a circuit that will not hold, a whistle, or a code for this valve. A stuck valve is often debris. Clean the ports before installing the new one.
QUALCAST supplies both parts for the 2021 Isuzu NRR.
This group includes QUALCAST 1013121 and QUALCAST 1013463.
Oil
Summary: Notes list SAE 10W-30 and SAE 15W-40. Confirm the weight on the filler cap before you buy. Replacement brands in this table include VALVOLINE.
Full Synthetic
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE | 909772 | 🇺🇸 US 🇨🇦 CA | Heavy Duty Full Synthetic SAE 15W-40 DIESEL1 Gallon | View on Amazon |
Heavy Duty / Diesel
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE | 909778 | 🇺🇸 US 🇨🇦 CA | Heavy Duty Conventional SAE 15W-40 DIESEL1 Gallon | View on Amazon |
Synthetic Blend
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE | 909766 | 🇺🇸 US 🇨🇦 CA | Heavy Duty Synthetic Blend SAE 15W-40 DIESEL1 Gallon | View on Amazon |
| VALVOLINE | 909776 | 🇺🇸 US 🇨🇦 CA | Heavy Duty Synthetic Blend SAE 10W-30 DIESEL1 Gallon | View on Amazon |
| VALVOLINE | 909782 | 🇺🇸 US 🇨🇦 CA | Heavy Duty Synthetic Blend SAE 15W-40 DIESEL2.5 Gallon | View on Amazon |
This table covers the engine oils listed by grade and specification for this engine. Typical signs include a low-oil lamp, knocking after a long interval, or oil that has gone thin and black well before the next service. Match the viscosity and spec in the notes (and on the filler cap). The tables group grades — they are not interchangeable.
VALVOLINE supplies the 5 Oil parts for the 2021 Isuzu NRR.
In the Full Synthetic grade, VALVOLINE supplies 1 part: full-synthetic oils. A representative part number is VALVOLINE 909772.
In the Heavy Duty / Diesel grade, VALVOLINE supplies 1 part: grouped under the catalog's "Heavy Duty / Diesel" designation — the notes column spells out what sets them apart. A representative part number is VALVOLINE 909778.
In the Synthetic Blend grade, VALVOLINE supplies 3 parts: synthetic-blend oils. A representative part number is VALVOLINE 909766.
Listed part numbers: VALVOLINE 909772, VALVOLINE 909778 and VALVOLINE 909766, plus the other parts above.
Oil Filler Cap
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD | MO101 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the caps on the oil filler neck.
One part is listed for the 2021 Isuzu NRR — MOTORAD MO101.
Oil Filter
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ECOGARD | X11646 | 🇺🇸 US 🇨🇦 CA | Premium Oil FilterStandard | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HASTINGS / BALDWIN | B40137 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WIX | WL10316 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the oil filters that screw onto this engine's filter mount. Typical signs include low oil pressure after a service, or a filter that will not spin off because the old gasket stayed on the block. Lube the new gasket and tighten to the spec on the box; a double-gasket install dumps the sump on the first drive.
3 Oil Filter parts are listed for the 2021 Isuzu NRR, from ECOGARD, HASTINGS / BALDWIN and WIX.
In the Economy grade, ECOGARD supplies 1 part: the catalog's value-priced group. A representative part number is ECOGARD X11646.
The Standard Replacement section lists 2 options from HASTINGS / BALDWIN and WIX — built to original-equipment specification. HASTINGS / BALDWIN B40137 is listed in this group.
Listed part numbers: ECOGARD X11646, HASTINGS / BALDWIN B40137 and WIX WL10316.
Turbocharger Wastegate Solenoid / Actuator
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 667947 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Turbocharger Wastegate Solenoid actuators. Typical signs include a door or range that will not move, or a click with no motion. Confirm the command signal before replacing the actuator — a failed module looks the same.
One part is listed for the 2021 Isuzu NRR — DORMAN 667947.
Valve Guide
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| QUALCAST | 303297 | 🇺🇸 US 🇨🇦 CA | 2.245 OAL. 0.316 I.D. 0.553 O.D. OEM # 8973767191 | View on Amazon |
| QUALCAST | 303101 | 🇺🇸 US 🇨🇦 CA | 2.245 OAL. 0.3150 I.D. 0.5526 O.D. OEM # 8943907800 | View on Amazon |
This table covers the pressed-in bronze and cast-iron guides that align valve stems. Typical signs include oil smoke on startup, a guide that has gone oval, or a valve that no longer seats quietly. Guides are a machine-shop fit. Confirm stem diameter in the notes before ordering.
QUALCAST supplies both parts for the 2021 Isuzu NRR.
Listed part numbers: QUALCAST 303297 and QUALCAST 303101.
Valve Seat
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| QUALCAST | 2215021 | 🇺🇸 US 🇨🇦 CA | INSERT | View on Amazon |
| QUALCAST | 2215022 | 🇺🇸 US 🇨🇦 CA | INSERT | View on Amazon |
This table covers the Valve seats.
2 Valve Seat parts for the 2021 Isuzu NRR come from QUALCAST.
This group includes QUALCAST 2215021 and QUALCAST 2215022.
Valve Stem Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| QUALCAST | 3896245 | 🇺🇸 US 🇨🇦 CA | Viton Ring and Spring | View on Amazon |
| QUALCAST | 38700255 | 🇺🇸 US 🇨🇦 CA | Viton Metal Clad. OEM # 8973767200 | View on Amazon |
This table covers the seals on each valve stem that control oil into the guides. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
QUALCAST supplies both parts for the 2021 Isuzu NRR.
This group includes QUALCAST 3896245 and QUALCAST 38700255.
Buying Engine Parts for a 2021 Isuzu NRR
On this vehicle, the engine covers the internals and hard parts that build compression and keep oil where it belongs — gaskets, bearings, camshafts, lifters, seals and timing components.
- Confirm you have the 5.2L L4 DIESEL Turbocharged engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the seals and gaskets for anything you open up; a timing job should always include the tensioner and guides, not just the belt or chain.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Oil and Oil Filter .
Frequently Asked Questions
How many engine parts fit the 2021 Isuzu NRR?
Our catalog currently lists 20 engine parts for the 2021 Isuzu NRR across 9 subcategories and 7 brands, covering the 5.2L L4 DIESEL Turbocharged engine. Each part is matched to the engine(s) it fits.
What are the signs of engine problems on a 2021 Isuzu NRR?
Common symptoms include oil spots under the vehicle, blue or white exhaust smoke, ticking from the valvetrain, or coolant mysteriously disappearing. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What oil viscosity is listed for the 2021 Isuzu NRR?
Oil rows on this page include SAE 10W-30 and SAE 15W-40. Confirm the engine and the weight on the filler cap before you buy — high-mileage and standard fills can differ.
What should I replace at the same time?
Where labor overlaps, replace the seals and gaskets for anything you open up; a timing job should always include the tensioner and guides, not just the belt or chain.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 Isuzu NRR was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2021 Isuzu NRR?
Every part on this page is matched to the 5.2L L4 DIESEL Turbocharged engine. Then engine hard parts are unforgiving of guesswork — confirm the casting or engine code before ordering, because one model year can hide two different blocks. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 Isuzu NRR
Engine Parts for Other Isuzu NRR Years
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