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
Price:
Negotiable
MOQ:
4 pcs
Delivery Time:
5-8 Work Days
Brand:
YIMI
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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Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.
Company
Yimi (Guangzhou) Automotive Parts Co, Ltd
Location
Unit 1313, Building 5, Changsheng DDP Fashion Center, No. 17 Dachi Road, Tancun, Shijing Subdistrict, Baiyun District, Guangzhou City.
Contact Person
James