Centrifugally Cast High-Alloy Cast Iron Cylinder Liner Set Wet Type with O-rings for Isuzu 4HG1T NQR71 Engine

Engine cylinder liner set (wet liners) provides durable, replaceable wear surfaces for piston rings. Restores compression, reduces oil consumption, and extends engine life for Isuzu 4HG1T turbo diesel engines.

• OE Quality: Manufactured to Isuzu dimensional and material specifications for perfect fit and long service life
• Complete Set: Includes 4 liners - no need to order individually
• Centrifugal Casting: Produces dense, uniform grain structure for high strength and wear resistance
• Precision Machined: Accurate bore size (108mm) and roundness for proper ring seal
• Plateau Honed Finish: Optimized surface finish for immediate ring seating
• Corrosion Resistant: Alloy composition resists cavitation erosion in wet liner applications
• Restores Engine Performance: Eliminates blow-by, low compression, and high oil consumption
• Direct Replacement: Drop-in or press-fit installation
• Cost-Effective: Affordable alternative to genuine OEM liners

This cylinder liner set is specifically designed for Isuzu NQR71 trucks with 4HG1T engine.

• ISUZU NQR71 (medium-duty truck, 4HG1T engine)
• May also fit other Isuzu models using the 4HG1T engine (e.g., NPR, NKR) - verify compatibility

• 4-Cylinder, Inline Diesel, Turbocharged
• Displacement: 4.3L (4330cc)
• Bore × Stroke: 108mm × 118mm (typical)
• Application: NQR71, NPR, and industrial equipment

Installation steps (overview for wet liners - typical for 4HG1T):

1. Remove cylinder head, pistons, and old liners from block (use a liner puller)
2. Clean block liner bores - remove rust, old O-ring residue, and debris
3. Inspect block counterbores - check for damage or corrosion
4. Install new O-rings onto the new liners (upper and lower seals)
5. Lubricate O-rings and liner outer surface with clean engine oil or soapy water
6. Press or drop new liners into the block bores - ensure they seat fully against the counterbore
7. Measure liner protrusion above the block deck using a dial indicator and straight edge. Protrusion should be within OE spec (typically 0.05-0.15mm). Adjust with shims if necessary
8. Hone the liners to final size (if needed) and to create a cross-hatch pattern
9. Clean liners thoroughly - remove honing residue
10. Install new pistons and rings, then cylinder head with new head gasket
11. Fill coolant and check for leaks

• Material Verification: Cast iron alloy composition and hardness tested
• Dimensional Inspection: ID (108mm), OD, length, flange height, and concentricity verified
• Surface Finish Test: Bore roughness (Ra) measured
• Hydrostatic Test: Liners pressure-tested for porosity
• Visual Inspection: 100% checked for casting defects or machining errors
• Packaged Safely: Coated with anti-rust oil, individually wrapped, boxed as a set with foam

• Neutral export packing or customized packaging available
• Carton or wooden case for safe transportation
• Fast delivery for stock items
• Shipping by Express Air or Sea