Product Introduction

• Structure: A solid, precision-machined tappet made from high-strength alloy steel with a hardened surface for maximum wear resistance. It features a smooth, cylindrical design with a polished working surface to minimize friction and ensure smooth operation.

• Performance: Transmits the camshaft’s rotational motion into linear motion to open the engine’s intake and exhaust valves. The hardened surface and precise tolerances ensure consistent valve timing and long service life even under high loads and rapid cycling.

Core Function

1. Motion Transmission: Transfers the lifting motion from the camshaft lobe to the valve stem, opening and closing the valve at the correct timing.

2. Friction Reduction: The polished, hardened surface minimizes friction between the tappet and camshaft, reducing wear and ensuring efficient operation.

3. Valve Timing Stability: Maintains accurate valve lift and timing, which is critical for optimal engine performance, fuel efficiency, and emissions control.

Valve Tappet 6105Q-1007091A Yuchai – OEM-Grade Engine Component for Heavy-Duty Applications

Every combustion cycle depends on precise valve timing, and at the heart of that precision sits one unsung hero — the Valve Tappet 6105Q-1007091A Yuchai. Engineered to meet the rigorous demands of Yuchai 6105 series diesel engines, this tappet faithfully transmits camshaft motion to the valve train, ensuring each intake and exhaust valve opens and closes with micron-level accuracy. When your fleet’s uptime is on the line, settling for anything less than OEM-equivalent quality is a gamble you cannot afford.

METTLEAD Truck Parts brings this critical engine component direct from verified Chinese manufacturing lines to your warehouse — at factory-direct pricing, with strict quality control at every production stage.

Key Functions and Benefits of the Valve Tappet 6105Q-1007091A

Precision Valve Train Actuation

The Valve Tappet 6105Q-1007091A Yuchai serves as the direct mechanical interface between the camshaft lobe and the pushrod. It absorbs the cam’s rotational profile and translates it into linear motion — quietly, reliably, and with minimal friction loss. This ensures your engine breathes efficiently across the full RPM band.

Wear-Resistant Surface Hardening

The tappet’s contact face undergoes chilled cast iron treatment or induction hardening (depending on batch specification), delivering a surface hardness exceeding HRC 55. This means it stands up to hundreds of thousands of kilometers of high-frequency cam contact without pitting or excessive wear.

Tight Dimensional Tolerances

Manufactured to OEM dimensional standards, this valve tappet maintains bore-to-tappet clearance within 0.015–0.045 mm, preventing oil blow-by while ensuring free reciprocating movement inside the tappet bore.

Reduced Valve Train Noise

A precisely finished crown radius matches the Yuchai camshaft lobe geometry, minimizing point-contact stress concentrations and keeping valve train noise to a whisper — even under full-load operating conditions.

Direct Cost Savings

Sourced at factory-direct pricing from METTLEAD, procurement managers typically realize 30–50% cost savings compared to aftermarket distributors in Southeast Asia, Africa, and the Middle East — without sacrificing part integrity.

Technical Specifications

Parameter	Specification
Part Number	6105Q-1007091A
Applicable Engine	Yuchai YC6105 / YC6108 Series Diesel Engines
Component Type	Mechanical Flat Tappet (Solid Lifter)
Material	Chilled Alloy Cast Iron
Surface Hardness	≥ HRC 55 (contact face)
Outer Diameter	Φ25 mm (nominal)
Overall Length	~52 mm
Bore Clearance	0.015–0.045 mm
Surface Finish (Crown)	Ra ≤ 0.4 μm
Weight (per piece)	~95 g
OEM Cross-Reference	Yuchai Original 6105Q-1007091A
Packaging	Individual neutral / custom packaging available
MOQ	Contact for bulk pricing

Application Scenario — Heavy-Duty Vehicle Fitment

The Valve Tappet 6105Q-1007091A Yuchai finds its home inside the valve train of Yuchai YC6105QC and YC6108 series diesel engines — workhorses that power a wide range of medium- and heavy-duty Chinese trucks and buses. These engines are commonly found in:

• Dongfeng EQ153 / EQ1168 series medium trucks
• FAW Jiefang CA1092 and related models equipped with Yuchai power
• Foton Auman mid-range trucks configured with YC6108 engines
• King Long / Yutong / Higer transit and intercity buses using Yuchai diesel platforms
• Various construction and agricultural machinery utilizing the 6105/6108 engine block

In these applications, the valve tappet operates in a punishing thermal and mechanical environment — engine oil temperatures reaching 120°C, cam-contact frequencies exceeding 25 Hz at rated speed, and vibration loads from uneven road surfaces. The 6105Q-1007091A is purpose-built to thrive in exactly these conditions, delivering reliable valve actuation across a service life matching OEM replacement intervals.

OEM/ODM Capabilities

White-Label and Custom Packaging

METTLEAD supports full white-label programs. Whether you need neutral brown-box packaging for your own aftermarket brand or custom-printed retail cartons with your logo, part numbers, and barcodes — we handle it from our facility in China.

Strict Quality Control Protocol

Every batch of Valve Tappet 6105Q-1007091A Yuchai passes through:

1. Incoming material inspection (alloy composition and hardness verification)
2. In-process dimensional checks (CNC turning tolerances audited per ISO 2768-m)
3. Surface hardness testing (Rockwell C-scale, 100% on contact face)
4. Final visual and packaging inspection before shipment

Flexible Order Configurations

Whether you need 100 pieces for a trial order or 10,000+ pieces for annual supply contracts, METTLEAD scales production without compromising lead time — typical dispatch within 3–7 working days for stocked SKUs.

Customer Case Study

East African Fleet Operator Cuts Downtime with Valve Tappet 6105Q-1007091A Yuchai

A Kenyan logistics company managing 45 Dongfeng trucks (YC6105QC-powered) was experiencing premature valve train wear after switching to a low-cost local aftermarket supplier. Tappet surfaces were pitting within 60,000 km, leading to noisy valve trains, poor fuel economy, and unplanned engine teardowns.

After sourcing the Valve Tappet 6105Q-1007091A Yuchai through METTLEAD, their maintenance team reported:

• Zero tappet-related failures after 150,000 km across the first batch of overhauled engines
• 14% reduction in unscheduled engine maintenance events fleet-wide
• Consistent valve lash readings at 80,000 km service intervals — indicating minimal tappet crown wear
• 23% procurement cost savings compared to their previous supplier, thanks to METTLEAD’s direct-factory pricing

“We tested three suppliers before settling on METTLEAD. The 6105Q-1007091A tappets run quieter, last longer, and cost less. That is the trifecta our procurement team needed.” — Fleet Maintenance Manager, Nairobi

Frequently Asked Questions About the Valve Tappet 6105Q-1007091A Yuchai

What engine models does the Valve Tappet 6105Q-1007091A fit?

This tappet is designed for Yuchai YC6105QC and YC6108 series diesel engines. It is a direct dimensional replacement for the original Yuchai part number 6105Q-1007091A, fitting all cylinder head variants across these engine families.

How do I verify the Valve Tappet 6105Q-1007091A is correct for my engine?

Match the part number stamped on your existing tappet or cross-reference against your Yuchai engine parts manual. If you provide your engine nameplate data (model, serial number, production year), our team can confirm fitment within 24 hours.

What is the expected service life of this valve tappet?

Under normal operating conditions (proper oil change intervals, correct valve lash adjustment), the 6105Q-1007091A typically delivers 200,000–300,000 km before requiring inspection or replacement — consistent with Yuchai’s OEM service recommendations.

Can the Valve Tappet 6105Q-1007091A be used with adjusted valve clearance settings?

This tappet is a solid (non-hydraulic) mechanical lifter. Valve clearance must be set manually per Yuchai specifications (typically 0.30–0.40 mm intake, 0.40–0.50 mm exhaust, cold). Improper clearance will accelerate tappet wear regardless of component quality.

What material is the tappet made from, and why does it matter?

The 6105Q-1007091A is manufactured from chilled alloy cast iron with a ledeburite microstructure on the contact face. This gives it carbide-rich hardness where it matters most — at the cam interface — while maintaining a tough, crack-resistant body.

Do you supply the full valve train kit, or just individual tappets?

We supply the Valve Tappet 6105Q-1007091A Yuchai individually or in engine sets (typically 12 pieces for a 6-cylinder inline). We also stock matching pushrods, rocker arms, and valve springs for the same engine series. Browse our full Yuchai Engine Parts catalog for compatible components.

Ready to Secure Your Supply of Valve Tappet 6105Q-1007091A Yuchai?

Your engines will not wait, and neither should your parts procurement. Whether you need a sample shipment to validate quality or a bulk annual contract with fixed pricing, METTLEAD’s team responds to inquiries within 12 hours with pricing, lead times, and shipping options tailored to your region.

Contact us now
to request a quotation on the Valve Tappet 6105Q-1007091A Yuchai — include your target quantity and destination port for the fastest response.

You are also welcome to visit our facility in China for an on-site quality audit and face-to-face sourcing discussion.