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how to adjust automatic cam chain tensioner
2025-07-11 13:53:43

how to adjust automatic cam chain tensioner

The automatic cam chain tensioner is an important component in motorcycle engine maintenance. Its function is to maintain the proper tension of the cam chain and ensure the normal operation of the engine. Correct adjustment can not only extend the service life of the chain, but also avoid engine failure caused by loose or overtightened chain. This article will introduce in detail how to adjust the automatic cam chain tensioner to help motorcycle owners and maintenance personnel master this key skill.

1. The role and importance of the automatic cam chain tensioner

The main function of the cam chain tensioner is to automatically adjust the tension of the cam chain through the internal spring or hydraulic device to prevent the chain from loosening or overtightening due to wear or thermal expansion and contraction. If the chain tension is not appropriate, it may cause abnormal engine noise, chain skipping and even engine damage. Therefore, regular inspection and adjustment of the cam chain tensioner is an indispensable part of motorcycle maintenance.

2. Steps to adjust the automatic cam chain tensioner

(I) Preparation
Tool preparation: Prepare appropriate tools, such as wrenches, screwdrivers, torque wrenches, etc.
Environmental preparation: Make sure the motorcycle is parked on a stable surface, turned off and cooled for a while to avoid burns.
Reference manual: Prepare the motorcycle's maintenance manual to check the specific location and adjustment requirements of the relevant parts.
(ii) Disassembly and inspection
Loosen the tensioner bolt: Find the bolt of the cam chain tensioner, which is usually located on the side of the engine. First loosen the central bolt to release the pressure of the internal spring.
Check the tensioner status: During the disassembly process, check the appearance of the tensioner for damage, such as cracks or deformation. At the same time, check whether the internal spring is working properly.
Check the chain status: Before adjusting the tensioner, check the wear of the chain. If the chain is severely worn, it may need to be replaced.
(iii) Adjust the tensioner
Reset the tensioner: Without reinstalling the spring and bolt, press the tensioner ratchet and push the plunger completely back into the valve body to reset the tensioner.
Install the tensioner: Reinstall the tensioner body back to the engine, making sure the O-ring is in good condition and properly aligned. Install the spring, bolt and washer, and tighten the bolt.
Adjust chain tension: Check the chain tension by rotating the crankshaft two full turns. The chain should be evenly distributed on the sprocket without obvious depressions or protrusions.
(IV) Inspection and verification
Check valve clearance: After adjusting the tensioner, recheck the valve clearance to ensure that all valve clearances meet the standard.
Start test: After completing the adjustment, start the motorcycle, run it for a while, and check the operation of the chain. If there is any abnormal noise or abnormal vibration, further adjustment may be required.

III. Precautions

Avoid overtightening: During installation and adjustment, avoid overtightening the bolts to avoid damage to the components.
Regular inspection: It is recommended to check the status of the cam chain tensioner every certain mileage (such as 5,000 kilometers).
Professional help: If you are unsure of your operation, it is recommended to seek help from a professional maintenance personnel.

IV. Common problems and solutions

Abnormal chain noise: If the chain makes an abnormal noise, it may be that the chain is too loose or the tensioner is faulty. The problem can be solved by adjusting the tensioner or replacing the chain.
Tensioner failure: If the tensioner does not work properly, you may need to replace it with a new one.

V. Summary

Hightac motorcycle accessories company reminds you: The adjustment of the automatic cam chain tensioner is an important part of motorcycle maintenance. Through correct adjustment, you can ensure the normal operation of the engine and extend the service life of the chain and engine. I hope that the introduction of this article can help motorcycle owners and maintenance personnel better master this skill and ensure the safety and performance of the motorcycle.
If you encounter any problems during the adjustment process, it is recommended to refer to the motorcycle maintenance manual or consult a professional maintenance personnel.

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