RZ4E Engine Auto Tensioner 8983786751 Adjust Timing Gear Timing Chain Isuzu Dmax Pickup Engine Parts

ISUZU Dmax RZ4E Engine Auto Tensioner

Core function of a timing chain tensioner is to automatically maintain the proper tension of the engine's timing chain.

I. Primary Functions
Maintains Correct Tension:

Engines expand and contract with heat during operation, and the timing chain itself will naturally stretch and wear over time. The tensioner's role is to continuously and automatically press against the timing chain to take up any slack caused by stretching, preventing it from becoming too loose.

Prevents Skipping Teeth and Derailment:

This is the most critical function. If the chain becomes too loose, it can "jump a tooth" during high-speed engine operation—meaning the chain skips over one or more teeth on the timing sprockets.

If this happens, the engine's valve timing (the precise timing for the opening and closing of the valves) becomes completely incorrect. This will cause the engine to run poorly, experience severe shaking, loss of power, and can even lead to pistons colliding with the valves, resulting in catastrophic "valve float" or "valve bending" damage, which is extremely expensive to repair.

Reduces Noise and Vibration:

A loose chain will flap around violently during operation, hitting other engine components and creating a "rattling" or "clattering" metal-on-metal noise. The tensioner quiets these noises and vibrations by keeping the chain taut, resulting in smoother and quieter engine operation.

Improves Drive Efficiency and Extends Lifespan:

Maintaining proper tension ensures that engine power is transmitted precisely and efficiently through the timing system, reducing unnecessary power loss. Furthermore, smooth operation reduces wear on the chain, sprockets, and guides, extending the service life of the entire timing system.

II. How It Works
Modern automotive timing chain tensioners are typically hydraulic automatic tensioners. Their working principle is as follows:

Hydraulic Oil Chamber: The tensioner contains a small chamber filled with engine oil.

Piston and Spring: Inside the chamber, there is a piston backed by a spring that provides initial pressure.

Automatic Adjustment:

When the engine starts: Engine oil pressure hasn't yet built up. The internal spring pushes the piston out to apply an initial tensioning force to the chain, preventing it from slapping at the moment of startup.

During engine operation: Engine oil pressure enters the tensioner's oil chamber, hydraulically pushing the piston to provide a more stable and powerful tensioning force, working together with the spring. When the chain momentarily loosens due to load changes, the hydraulic system responds instantly to compensate, maintaining constant tension.

Check Valve: The tensioner usually contains a one-way check valve that allows oil to flow in but prevents it from flowing back out quickly. This helps the tensioner maintain its position for a while even after the engine is shut off and oil pressure drops, preventing the chain from becoming slack.

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Our Service

1. Supply ISUZU genuine parts , ISUZU Bvp parts , OEM parts , high cost performance China manufacture parts .

2. General agent of ORIGIN PARD in China.

3. Thirty years of retail and wholesale experience . The sales group with average of five years experience , can answer any professional question . Equipped with a professional quality inspection team.

4. Running seven stores , manage in commercial vehicle and industrial engine parts.

5. Can offer competitive purchase price to our client , cause we attain developed distribution channel over the world.

FAQ

1.Q:What is your terms of payment?

A:T/T 30% as deposit, and 70% before delivery. We'll show you the photos of the products and packages before you pay the balance.

2.Q:Are you manufacturer or trading company?

A: We are both factory and trading company , we combination for more than 10 years. We have invested in 3 factories.

3.Q: How about the delivery time of the goods?

A: For testing sample, which it depends on the storage.

For bulk production, the delivery time is about 15-30 days based on order situation.

4.Q.:Can you produce according to the samples?

A: Clients’ sample is welcome. We are able to produce the specific products according to your sample.
If you do not find the product you need, tell us detailed information, we have the ability to design and manufacture as requested.

5.Q: Can I get a lower price if I order large quantities?

A: Yes, cheaper prices with more bigger size orders.