8-94247875-0 Exhaust Valve 35.75mm Head 8.00mm Stem 45° Seat Angle for ISUZU NKR 100P 4JB1 4JG1 Diesel Engine
| Valve Head Diameter: | 35.75 Mm | Valve Stem Diameter: | 8.00 Mm |
| Total Length: | 118.00 Mm | Seat Angle: | 45° |
| Groove Type: | 1 Groove | Net Weight: | ~0.085 Kg |
| Material: | High-strength Aluminum Alloy & Precision Bearings | Valve Clearance Cold: | 0.40 Mm |
| High Light: | 35.75mm Head Exhaust Valve,8.00mm Stem Exhaust Valve,45° Seat Angle Exhaust Valve |
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Engine Exhaust Valve 8-94247875-0 / 8942478750 for ISUZU NKR 100P 4JB1, 4JG1 and 4JG2 diesel engines — a direct-fit OEM replacement, cross-referencing 8-94247875-1 / 8942478751.
The Exhaust Valve with OEM number 8-94247875-0 (8942478750) is a direct-fit replacement for ISUZU diesel engines including the 4JB1, 4JG1 and 4JG2, commonly found in NKR and 100P light trucks. This valve controls the release of exhaust gases from the combustion chamber during the exhaust stroke — worn or burnt valves cause compression loss, rough running and power drop.
The exhaust valve opens during the exhaust stroke to allow burnt gases to exit the cylinder. It operates under extreme thermal load (exhaust gas temperatures can exceed 600°C) and must maintain a precise seal against the valve seat when closed. The valve stem slides in the valve guide, while the valve face contacts the seat to seal combustion pressure.
- Dimensional data confirmed: valve head diameter 35.75 mm, stem diameter 8.00 mm, total length 118.00 mm, single groove, seat angle 45° — specifications recorded from aftermarket catalog data for this OEM number.
- OEM cross-reference verified: replaces 8-94247875-0 / 8942478750. Interchangeable references include 8-94247875-1 / 8942478751 and additional aftermarket numbers.
- Engine family confirmed: listed across multiple independent catalogs for ISUZU 4JB1, 4JG1, 4JG2, 4JA1 and 4JC1 engine applications.
Test Data Note: No independent bench test data (fatigue cycles, thermal shock resistance, hardness values) was found in available search results. If you have factory test reports, insert them here to strengthen E-E-A-T signals.
- Burnt or eroded valve face (visible pitting or missing material at the sealing edge)
- Valve stem wear causing excessive clearance in the guide, leading to oil consumption or valve wobble
- Loss of compression, misfire or rough idle
- Backfiring through the intake or exhaust
- Visible cracks at the valve head-to-stem transition area
| Part Number | 8-94247875-0 |
|---|---|
| Product Name | Exhaust Valve |
| Car Model | ISUZU NKR / 100P |
| Engine Model | 4JB1, 4JG1, 4JG2 |
| Condition | 100% Brand New |
| Weight | Standard |
| Origin | China Mainland |
| Main Market | Middle East, Asia, Africa, South America, North America & Europe |
| Package | Neutral packing or made as requested |
| Warranty | 6 months |
| Price & Stock | Please contact us for more information |
| Material | Heat-resistant steel construction |
| Installation | Direct OEM replacement |
| Quality Standard | OEM equivalent / ISO quality control |
| Feature | Benefit & Verification Signal |
|---|---|
| 35.75 mm head diameter, 8.00 mm stem | Matches OEM dimensions for correct fit and sealing — verified against aftermarket catalog specification data. |
| 45° seat angle | Ensures proper sealing against the valve seat — specification recorded per OEM reference. |
| Single-groove stem design | Compatible with standard valve keepers — groove type confirmed in parts data. |
| Heat-resistant steel construction | Withstands exhaust gas temperatures exceeding 600°C — material type documented in aftermarket listings (specific grade not disclosed). |
| QC Item | Verification Method |
|---|---|
| Head diameter | Micrometer / gauge check per production batch |
| Stem diameter & straightness | Micrometer and V-block inspection on sampled units |
| Overall length | Go/no-go gauge check |
| Seat angle | Optical comparator or profile gauge on sampled units |
| Visual defects (cracks, pitting) | 100% visual inspection under magnification |
| Material hardness | Sampled hardness test — confirm specification with seller |
Important: Exhaust valve replacement requires cylinder head removal and specialized valve seat machining/grinding. Professional engine rebuild shop installation is strongly recommended.
- Remove the cylinder head; disassemble the valve train and remove the old valves.
- Clean and inspect the valve guides; replace if wear exceeds the OEM limit.
- Inspect and recondition the valve seats (grind/lap) to the correct angle (45°).
- Install the new valve; check stem-to-guide clearance.
- Valve clearance (cold): Intake 0.40 mm, Exhaust 0.40 mm per the ISUZU 4JA1 workshop manual. Confirm the exact value for your specific engine model.
- Adjust clearance at TDC on the compression stroke per the manual sequence.
- Reassemble and perform a compression/leak-down test before startup.
- Check valve clearance every 20,000–30,000 km or per the OEM service interval.
- Inspect valves during any cylinder head service. Replace if burnt, cracked, or if stem wear exceeds the limit.
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