This rear crankshaft oil seal is manufactured as a direct OE-style replacement for Isuzu NRR, NQR, NPR, and NPR-HD trucks equipped with 4HE1 4.8L or 4HK1 5.2L diesel engines (1998–2025). Designed to prevent engine oil leakage at the rear main crankshaft position, this seal maintains proper lubrication system integrity while protecting the flywheel and clutch components. Precision-molded to match factory dimensions, it ensures correct fitment, sealing pressure, and long-term durability. Constructed from high-quality oil- and heat-resistant elastomer materials, the seal is built to withstand high RPM operation, crankcase pressure fluctuations, and continuous commercial-duty engine cycles.
OE-Spec Rear Main Seal — Manufactured to match original size and sealing lip design for accurate crankshaft fit.
Vehicle Compatibility — Fits ISUZU NRR, NQR, NPR, and NPR-HD with 4HE1 (4.8L) and 4HK1 (5.2L) diesel engines, 1998–2025.
Leak Prevention Solution — Helps eliminate rear main oil leaks and protects clutch/flywheel area.
Heat & Oil Resistant Material — Engineered to handle high engine temperatures and continuous lubrication exposure.
Commercial-Duty Durability — Suitable for fleet, delivery, and heavy-use truck applications.
Direct Replacement Fit — Installs in factory rear crankshaft position with no modifications required.
OEM
8976023790 / 8983343390 / 8943706370
Specifications
| SKU / Part Number | 7602379 |
|---|---|
| Brand | CHM |
| OEM | 8976023790, 8983343390, 8943706370
|
| Weight | 0.38 lb |
| Dimensions (L × W × H) | 6 in × 6 in × 1 in |
| Category | Engine Parts Gaskets, Seals & O-Rings |
Compatibility
| Make | Model | Years | Engine | Liters | Fuel |
|---|---|---|---|---|---|
| Isuzu | NPR | 1998–2004 | 4HE1-TC | 4.8 | Diesel |
| Isuzu | NPR | 2005–2010 | 4HK1-TC | 5.2 | Diesel |
| Isuzu | NPR | 2011–2016 | 4JJ1-TC | 3.0 | Diesel |
| Isuzu | NPR-HD | 1999–2004 | 4HE1-TC | 4.8 | Diesel |
| Isuzu | NPR-HD | 2005–2016 | 4HK1-TC | 5.2 | Diesel |
| Isuzu | NQR | 1998–2004 | 4HE1-TC | 4.8 | Diesel |
| Isuzu | NQR | 2005–2010 | 4HK1-TC | 5.2 | Diesel |
| Isuzu | NRR | 2005–2016 | 4HK1-TC | 5.2 | Diesel |
| Chevrolet | W3500 Tiltmaster | 1998–2004 | 4HE1-TC | 4.8 | Diesel |
| Chevrolet | W3500 Tiltmaster | 2005–2009 | 4HK1-TC | 5.2 | Diesel |
| Chevrolet | W4500 Tiltmaster | 1999–2004 | 4HE1-TC | 4.8 | Diesel |
| Chevrolet | W4500 Tiltmaster | 2005–2010 | 4HK1-TC | 5.2 | Diesel |
| Chevrolet | W5500 Tiltmaster | 1999–2004 | 4HE1-TC | 4.8 | Diesel |
| Chevrolet | W5500 Tiltmaster | 2005–2010 | 4HK1-TC | 5.2 | Diesel |
| Chevrolet | W5500HD Tiltmaster | 2005–2010 | 4HK1-TC | 5.2 | Diesel |
| GMC | W3500 Forward | 1998–2004 | 4HE1-TC | 4.8 | Diesel |
| GMC | W3500 Forward | 2005–2009 | 4HK1-TC | 5.2 | Diesel |
| GMC | W4500 Forward | 1999–2004 | 4HE1-TC | 4.8 | Diesel |
| GMC | W4500 Forward | 2005–2010 | 4HK1-TC | 5.2 | Diesel |
| GMC | W5500 Forward | 1999–2004 | 4HE1-TC | 4.8 | Diesel |
| GMC | W5500 Forward | 2005–2010 | 4HK1-TC | 5.2 | Diesel |
| GMC | W5500HD Forward | 2005–2010 | 4HK1-TC | 5.2 | Diesel |