Engine Piston 8-97095-585-1 8970955851 For ISUZU 4HF1 NPR ELF Truck — Verified OEM Direct Fit, 112mm STD Alfin Oil-Gallery Diesel Piston
| OEM Part Number: | 8-97095-585-1 / 8970955851 | Part Name: | Standard Engine Piston (with Pin & Clip Options) |
| Engine Compatibility: | ISUZU 4HF1 (4.3L, Naturally Aspirated) | Vehicle Models: | ISUZU NPR, ELF 250/350 (1999–2009) |
| Material: | Aluminum Alloy With Alfin Insert | Piston Diameter: | 112 Mm |
| Compression Height (KH): | 60.7 Mm | Piston Length: | 79 Mm |
| Piston Pin Diameter: | 36 Mm | Ring Groove (Top / 2nd / Oil): | 3.0 / 2.5 / 4.0 Mm |
| Combustion Chamber: | 54 Mm | Condition: | Brand New — 100% Quality Inspected |
| Warranty: | 1 Year (standard Replacement Warranty) | Surface Treatment: | Tin Coating |
| Construction Features: | Alfin Insert, Oil Gallery, Phosphate-skirt | ||
| High Light: | Isuzu 4HF1 diesel engine piston,OEM direct fit truck piston,112mm STD Alfin oil-gallery piston |
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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.
- 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
- 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
| 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 |
| 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 |
| 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.
- 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
- 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
- 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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