Engine Piston 8-97367397-1 8973673971 For ISUZU 4JJ1 4JJ1-TC NPR NQR D-MAX ELF — Verified OEM Direct Fit, 95.4mm STD Alfin Oil-Gallery Diesel Piston
Basic Properties
Place of Origin:
China
Brand Name:
YIMI
Certification:
ISO/TS16949
Model Number:
ISUZU 4JJ1 4JJ1-TC NPR NQR D-MAX ELF
Trading Properties
Minimum Order Quantity:
4 pcs
Price:
Negotiable
Payment Terms:
T/T
Supply Ability:
4000 pcs/month
Specifications
| OEM Part Number: | 8-97367397-1 / 8973673971 | Part Name: | Standard Engine Piston (with Pin & Clip Options) |
| Engine Compatibility: | ISUZU 4JJ1 / 4JJ1-TC (3.0L, 2,999 Cc) | Vehicle Models: | ISUZU D-MAX (TFR/TFS), NPR, NQR, NHR, NKR, ELF; Chevrolet/GMC W-Series; Small Excavators |
| Material: | ZL109 Aluminum Alloy With Alfin Insert | Piston Diameter: | 95.4 Mm |
| Compression Height (KH): | 49.8 Mm | Total Length: | 78.4–78.5 Mm |
| Piston Pin Size: | 34 × 78 Mm | Ring Groove (Top / 2nd / Oil): | 2.0K / 1.5 / 3.0 Mm |
| Combustion Chamber: | Ø55 Mm | Condition: | Brand New — 100% Pressure Tested |
| Warranty: | 12 Months | Bowl Depth: | -16 Mm |
| Surface Treatment: | Graphite-coated Skirt; Tin-plated Option Available | Construction Features: | Alfin Insert, Internal Oil Cooling Gallery |
| Cylinder Configuration: | 4-cylinder Inline | Certification: | ISO/TS16949, ISO9001:2000 |
| High Light: | Isuzu 4JJ1 diesel engine piston,OEM direct fit Alfin piston,95.4mm STD oil-gallery piston |
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Product Description
Engine Piston 8-97367397-1 8973673971 For ISUZU 4JJ1 4JJ1-TC NPR NQR D-MAX ELF
Verified OEM Direct Fit, 95.4mm STD Alfin Oil-Gallery Diesel Piston
Product Overview
The Engine Piston with OEM numbers 8-97367397-1 / 8973673971 is a verified direct-fit replacement for ISUZU 4JJ1 / 4JJ1-TC (3.0L) diesel engines. This piston is a critical reciprocating component responsible for converting combustion pressure into crankshaft rotation and managing thermal load within the cylinder. The 4JJ1 is a 2,999 cc water-cooled inline-4 DOHC 16-valve common-rail diesel engine widely used in ISUZU D-MAX pickups, NPR/NQR commercial trucks, and ELF light-duty trucks from 2004 onward.
- Dimensional Verification: Piston diameter 95.4 mm, compression height 49.8 mm, total length 78.4-78.5 mm, pin size 34 × 78 mm, combustion chamber Ø 55 mm, bowl depth -16 mm
- Ring Groove Geometry: Ring grooves sized 2.0K mm (top) / 1.5 mm (second) / 3.0 mm (oil control)
- Material & Construction: Manufactured from ZL109 aluminum alloy with Alfin insert for ring-land reinforcement, internal oil cooling gallery, and graphite-coated skirt
- OEM Cross-Reference Verified: Replaces multiple OEM part numbers and international brand references
- Multi-Platform Application: Confirmed compatible with ISUZU D-MAX, NPR, NQR, NHR, NKR, and ELF series trucks and pickups
Failure Symptoms & Replacement Indicators
- Loss of engine compression: Worn or stuck piston rings reduce cranking pressure, causing hard starting and noticeable power loss
- Excessive exhaust smoke (blue/white/black): Indicates oil passing rings or incomplete combustion
- Increased oil consumption: Glazed bores or tired ring packs allow oil to enter combustion chamber
- Piston scoring or scuffing: Visible skirt wear or liner wall scoring caused by thermal expansion or insufficient lubrication
- Knocking or tapping noise: Piston slap or bearing wear requiring immediate inspection
| Part Number | 8-97367397-1 8973673971 |
|---|---|
| Product Name | Piston |
| Car Model | ISUZU NPR NQR D-MAX ELF |
| Engine Model | ISUZU 4JJ1 4JJ1-TC |
| Condition | 100% Brand New |
| Size | Standard |
Vehicle & Engine Compatibility
| Brand | Model / Series | Engine | Years |
|---|---|---|---|
| ISUZU | D-MAX (TFR/TFS) | 4JJ1-TC | 2004-2012 |
| ISUZU | NPR | 4JJ1-TC | 2007+ |
| ISUZU | NQR | 4JJ1-TC | 2007+ |
| ISUZU | ELF | 4JJ1-TC | 2004+ |
Important Fitment Notes: Confirm engine variant (4JJ1 vs. 4JJ1-TC), verify piston-to-bore clearance, and always check OEM number against engine tag before ordering. Piston rings and pin are not included unless specified.
Features & Benefits
Alfin Insert
Reinforces top ring groove against thermal fatigue and micro-welding
Internal Oil Cooling Gallery
Improves heat dissipation from crown and ring zone, reducing scuffing risk
Graphite-Coated Skirt
Provides self-lubricating properties during cold starts and reduces friction
Precision Ring Grooves
Ensures correct ring seating and sealing to restore compression
ZL109 Aluminum Alloy
Lightweight, high-strength material with efficient heat dissipation
95.4 mm STD Diameter
Direct-fit replacement for original bore without machining
Quality Control & Verification
| QC Item | Verification Method |
|---|---|
| Piston diameter / ovality | CMM dimensional inspection against OEM drawing (95.4 mm) |
| Ring groove width & depth | Go/no-go gauge verification (2.0K/1.5/3.0 mm) |
| Pin bore diameter & concentricity | Precision bore gauge (34 mm) |
| Material chemistry | Spectrometer analysis (ZL109 aluminum alloy) |
| Surface treatment thickness | Graphite coating thickness measurement |
Manufacturing conforms to ISO/TS16949 and ISO9001:2000 quality standards. Each unit undergoes 100% quality inspection before packaging.
Installation & Maintenance
Professional engine rebuild experience required. Always refer to the ISUZU 4JJ1 workshop manual for complete specifications. Improper installation can result in engine damage and serious injury.
Installation Guidelines:
- Verify fitment: Confirm piston diameter (95.4 mm), compression height (49.8 mm), and ring groove dimensions
- Check piston-to-bore clearance against manual specification
- Install rings with correct orientation and stagger ring end gaps at 120° intervals
- Lubricate pin bore and install piston pin with new snap rings
- Follow connecting rod torque sequence per manual specifications
Maintenance Schedule:
- Engine oil capacity: 6.5-7.0L including filter - replace every 10,000 km or 12 months
- Inspect compression and oil consumption every 50,000 km or annually
- Replace piston rings and inspect pistons during top-end overhaul
- Monitor coolant condition and EGR system regularly
Packaging & Supply
- Standard packing: Neutral packaging / corrugated carton
- Set options: Piston only, or piston set with pin & clips
- Minimum order: 4 pcs per order
- Export packing: Wooden crate, moisture barrier options available
- Suitable for: Engine rebuild workshops, fleet maintenance, spare parts distributors
- Related parts available: Piston ring sets, cylinder liner kits, and full 4JJ1 overhaul kits
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