8-94239501-0 Isuzu 4JJ1 Engine Valve Lock – for Hitachi Sumitomo Sany 135 Excavator

Product Title

8-94239501-0 Isuzu 4JJ1 Engine Valve Lock – for Hitachi Sumitomo Sany 135 Excavator

Product Overview

This product is a dedicated valve lock (valve spring retainer lock) for the Isuzu 4JJ1 series diesel engine, with part number 8-94239501-0. The valve lock is a critical small component in the valve train, responsible for securing the valve spring upper retainer to the valve stem while withstanding high-frequency reciprocating loads to ensure precise valve opening and closing timing. Manufactured from high-strength alloy steel with precision processing and surface treatment, it offers excellent wear resistance and fatigue strength. It is suitable for 4JJ1 engines installed in Hitachi, Sumitomo, and Sany 135-class excavators.

Product Features

• OEM Specification – Manufactured to strict Isuzu OE standards for direct replacement without any modification.

• High-Quality Material – Made of high-strength alloy steel with precision forging and heat treatment for optimal balance of hardness and toughness.

• Precision Machining – Tapered mating surface precisely matches the valve stem groove for secure locking, effectively preventing valve drop-out or spring retainer loosening.

• Wear & Fatigue Resistant – Surface treated for corrosion and wear resistance, capable of withstanding high-frequency impact loads under continuous high-speed engine operation.

• Cost-Effective – OEM quality at competitive aftermarket pricing.

Technical Specifications (Reference)

Note: For more detailed specifications, please refer to the actual product or the OEM manual.

Compatible Vehicles / Equipment

• Hitachi, Sumitomo, and Sany 135-class excavators equipped with the Isuzu 4JJ1 engine.

• Please confirm compatibility with your original part number.

Packaging & Shipping

• Packaging: Carton box

• MOQ: 1 set (supplied per engine set)

• Lead Time: In stock, ships within 24 hours after order placement; bulk orders please contact us.

Precautions

• Valve locks are critical safety components in the engine valve train. Replacement must be performed by a professional technician.

• Clean the valve stem groove and retainer taper surface thoroughly before installation; remove any oil, dirt, or burrs.

• Use a proper valve spring compressor tool during installation to ensure the lock fully engages into the valve stem groove.

• It is recommended to replace all valve locks on the same engine as a complete set to ensure consistency and reliability.

• After installation, manually rotate the crankshaft to verify normal valve operation and confirm that the locks are securely in place.