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This authentic Sinotruk HOWO valve tappet (Part No: 081V04301-0121) is engineered to exact OEM specifications, ensuring optimal valve timing and engine performance in HOWO trucks. Designed for heavy-duty applications, it minimizes wear between the camshaft and valve stem, reducing friction and maintaining precise valve lift under extreme conditions. The hardened steel construction and precision grinding ensure longevity and reliability, making it a critical replacement for engine maintenance and rebuilds.
Technical Specifications:
Material: Heat-treated alloy steel (58-62 HRC surface hardness)
Diameter: 35.0 ± 0.05 mm
Height: 55.5 ± 0.1 mm
Surface Finish: Precision ground (Ra ≤ 0.4 μm)
Compatibility: HOWO A7, T7H series with WEICHAI WP10/WP12 engines
Temperature Resistance: -40°C to +250°C
Load Capacity: Supports camshaft loads up to 2000 N
Manufacturing Standard: ISO 9001 certified, OEM tolerances
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Installation Notes
Pre-Installation Checklist:
1.Inspect Components: Verify part number (081V04301-0121) and check for damage.
2.Clean Surfaces: Ensure camshaft and tappet bores are free of debris and oil residue.
3.Lubrication: Apply clean engine oil to tappet surfaces and camshaft lobes.
Installation Steps:
1.Position Tappet: Insert tappet into engine block bore with gentle hand pressure.
2.Align with Camshaft: Rotate camshaft to ensure tappet sits flush against the lobe.
3.Valve Lash Adjustment: Set valve clearance to 0.25–0.30 mm (cold engine).
4.Torque Specifications: Tighten rocker arm bolts to 85 ± 5 Nm.
Critical Warnings:
Never reuse old tappets; replace in sets per cylinder.
Check camshaft lobes for wear before installation.
Prime oil system before startup to prevent dry operation.
Post-Installation:
Run engine at idle and monitor for unusual valve train noise.
Re-check valve clearance after first 500 km of operation.
