Genuine Honda timing belt tensioner 14510-5AY-H01 Civic X 1.0

Genuine Honda Timing Belt Tensioner OEM 14510-5AY-H01

The Genuine Honda OEM timing belt tensioner, part number 14510-5AY-H01, is a critical component of the timing system in modern, turbocharged 1.0-liter Honda engines. As a Genuine Honda part, this tensioner is specifically engineered to operate in the demanding environment of a "wet timing belt" system (belt running in an oil bath), which requires maximum manufacturing precision and material durability.

The tensioner's primary role is to maintain constant, optimal tension on the timing belt, preventing belt slip and protecting the engine from catastrophic failure. By choosing an OEM component, you ensure that the spring characteristics and bearing tolerances are perfectly matched to the P10A2 engine's requirements, minimizing the risk of premature system wear.

Applications

This tensioner is exclusively dedicated to the 1.0-liter VTEC Turbo petrol engines with the P10A2 code, found in the following models:

• Honda Civic 5D (Hatchback): 2017-2021 – 1.0 Turbo models
• Honda Civic 4D (Sedan): 2020 – 1.0 Turbo models

OEM Reference Numbers

This part is the official Honda service replacement:

• 14510-5AY-H01

When to Replace / Symptoms of Wear

The tensioner must be replaced every time the timing belt is changed. Neglecting this component can lead to:

• Improper belt tracking, which accelerates belt degradation in the oil bath,
• Noise from the timing area (bearing whine or rumbling),
• Risk of the belt jumping teeth on the timing gears due to weakened tension, resulting in loss of valve synchronization.

Installation & Service Advice

• Important: Due to the "wet belt" design of the 1.0 Turbo (P10A2) engine, it is highly recommended that replacement be performed by a specialist workshop equipped with the correct timing locking tools and technical knowledge of oil-bathed systems.
• When replacing the tensioner, always install a new timing belt and inspect the oil pickup (oil strainer) for any debris from the aging belt.
• Always follow the torque specifications provided in the Honda service manual.

FAQ – Frequently Asked Questions about 14510-5AY-H01

Is this tensioner compatible with the 0W20 oil standard used in P10A2 engines?
Yes, as an OEM part, the 14510-5AY-H01 tensioner is designed to operate in low-viscosity oil baths. The sealing materials and bearings are resistant to swelling and chemical degradation caused by modern synthetic oils and their additives, which is the most common cause of failure for cheap aftermarket alternatives in this engine.

Why is it recommended to replace the tensioner more frequently in the 1.0 Turbo than in older designs?
The P10A2 engine features a "wet belt," meaning the tensioner is constantly exposed to combustion by-products and carbon particles circulating in the oil. Any oil contamination affects the wear of the tensioner's pulley surface and spring mechanism. Therefore, following the replacement interval for the entire kit (tensioner + belt) is vital for engine safety.

Does this tensioner fit the 1.5 Turbo engine?
No, the 1.5 Turbo engine (L15B7/L15BY) uses a timing chain and a completely different tensioning system. This tensioner is specifically for the 1.0 Turbo (P10A2) units which utilize a belt-in-oil design.