Engine Piston 8-97095-585-1 8970955851 For ISUZU 4HF1 NPR ELF Truck — Verified OEM Direct Fit, 112mm STD Alfin Oil-Gallery Diesel Piston
Price:
Negotiable
MOQ:
4 pcs
Delivery Time:
5-8 Work Days
Brand:
YIMI
Product Description
Engine Piston 8-97095-585-1 8970955851 For ISUZU 4HF1 NPR ELF Truck — Verified OEM Direct Fit, 112mm STD Alfin Oil-Gallery Diesel Piston
Product Overview
The Engine Piston with OEM numbers 8-97095-585-1 / 8970955851 is a verified direct-fit replacement for ISUZU NPR and ELF series trucks equipped with the 4HF1 (4.3L) diesel engine. This piston is a critical reciprocating component responsible for converting combustion pressure into crankshaft rotation and managing thermal load within the cylinder.
Technical Verification
- Dimensional Verification: Piston diameter 112mm, compression height 60.7mm, pin diameter 36mm, total length 79mm, combustion chamber 54mm
- Material & Construction: Aluminum alloy with Alfin insert for ring-land reinforcement, oil-gallery cooling channel, and tin coating
- Ring Groove Geometry: Ring grooves sized 3.0mm (top) / 2.5mm (second) / 4.0mm (oil control)
- OEM Cross-Reference Verified: Replaces multiple OEM part numbers including 8-97095-585-1, 8970955851, and others
Failure Symptoms — When to Replace
- Loss of engine compression: Worn or stuck piston rings reduce cranking pressure
- Excessive exhaust smoke (blue/white/black): Indicates oil passing rings or incomplete combustion
- Increased oil consumption: Glazed bores or tired ring packs allow oil entry
- Rough idle or misfire: Inconsistent compression across cylinders
- Visible scoring or wear: Physical damage to piston skirts or liner walls
Product Specifications
| Part Number | 8-97095-585-1 8970955851 |
| Product Name | Piston |
| Car Model | ISUZU NPR ELF |
| Engine Model | ISUZU 4HF1 |
| Condition | 100% Brand New |
| Size | Standard |
Vehicle & Engine Compatibility
| Brand | Model / Series | Chassis | Engine | Years |
|---|---|---|---|---|
| ISUZU | NPR | NPR | 4HF1 | 1999-2009 |
| ISUZU | ELF 250 | NKS | 4HF1 | 1993-1994 |
| ISUZU | ELF 350 | NKR | 4HF1 | 1990-1993 |
Important Fitment Notes: Confirm engine variant (4HF1 vs. 4HF1-2), verify piston-to-bore clearance and liner protrusion, and always verify OEM number against engine tag before ordering.
Features & Benefits
Alfin Insert
Reinforces top ring groove against thermal fatigue and micro-welding
Oil-Gallery Construction
Improves heat dissipation from crown and ring zone, reducing scuffing risk
Tin Coating
Enhances break-in characteristics and reduces friction during initial operation
Precision Ring Grooves
Ensures correct ring seating and sealing to restore compression
112mm 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 |
| Ring groove width & depth | Go/no-go gauge verification |
| Pin bore diameter & concentricity | Precision bore gauge |
| Material chemistry | Spectrometer analysis (aluminum alloy composition) |
Manufacturing conforms to GB1148-82, JB3931-85, and JB3932-85 piston standards.
Installation & Maintenance Recommendations
IMPORTANT: Professional engine rebuild experience required. Always refer to the ISUZU 4HF1 workshop manual for complete specifications.
Installation Guidelines
- Verify fitment: Confirm piston diameter (112mm), compression height (60.7mm), and ring groove dimensions
- Check piston-to-bore clearance: Measure cylinder liner bore and piston skirt diameter
- Ring installation: Install rings with correct orientation; stagger ring end gaps at 120° intervals
- Pin & clip installation: Lubricate pin bore and install piston pin; secure with new snap rings
- Connecting rod torque: Follow manual sequence for specific engine variant
Maintenance Schedule
- Inspect compression and oil consumption every 50,000 km or annually
- Replace piston rings and inspect pistons during any top-end overhaul
- When abnormal striking sounds are heard, replace piston and piston pin as a set
Packaging & Supply
- Standard packing: Corrugated carton with anti-rust paper; 4 pcs in one box
- Set options: Piston only, or piston set with pin & clips
- Suitable for: Engine rebuild workshops, fleet maintenance departments, spare parts distributors
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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