This front crankshaft oil seal is designed as a direct OE-style replacement for Isuzu NRR, NPR, NPR-HD, and NQR trucks equipped with 4HE1 4.8L or 4HK1 5.2L diesel engines (1998–2025). Installed at the front main crankshaft position, this seal helps prevent engine oil leakage.. Manufactured to precise OEM dimensions, it ensures proper sealing pressure, correct shaft contact, and long-term durability under continuous commercial-duty operation. Constructed from high-grade, oil- and heat-resistant elastomer, the seal is engineered to withstand high rotational speeds, crankcase pressure changes, and extended engine runtime common in fleet and medium-duty truck environments. 

OE-Spec Front Main Seal — Matches factory diameter and sealing lip configuration for accurate crankshaft fitment.

Vehicle Compatibility — Fits ISUZU NRR, NPR, NPR-HD, and NQR with 4HE1 (4.8L) and 4HK1 (5.2L) diesel engines, 1998–2025.

Leak Prevention at Front Engine Area — Helps eliminate oil seepage near timing cover and crank pulley.

Heat & Oil Resistant Construction — Designed to perform under high temperatures and continuous lubrication exposure.

Commercial-Grade Durability — Suitable for delivery fleets, work trucks, and heavy-use applications.

Direct Replacement Fit — Installs in factory front crankshaft location without modification.

OEM

8973297800 / 8943695180