232-15-15970 2321515970 Mechanical Engine Belt Tensioner GD355A-1 GD623A-1

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5. FAQ

Q: What common mistakes lead to early failure?

A: Skipping thorough cleaning can leave grit that scratches the sealing lip or prevents shims from seating flat. Installing the main seal crookedly or with the wrong tool can damage the lip, causing leaks immediately. Using the wrong combination of shims leads to incorrect bearing preload, resulting in excessive wear or overheating. Twisting or pinching the O-rings during installation creates hidden damage that will fail under pressure.

Q: How long can these parts last when installed correctly?

A: With clean lubrication, proper clearance settings, and correct installation, the sealing components can last between 5,000 and 10,000 operating hours. The metal shims are designed to last the life of the assembly unless they are bent or damaged during removal or service.

Q: Can I reuse any parts from the old kit?

A: The metal shims can only be reused if they are completely undamaged, free of bends or scratches, and their thickness is still within specification. The sealing components, including the central ring and all O-rings, should always be replaced with new ones. These rubber and composite parts experience compression set and hidden wear after being installed once, making them unreliable for reuse.

Q: What common mistakes lead to early failure?

A: Poor cleaning leaves debris that damages the seal lip or prevents the shims from seating flat. Installing the oil seal unevenly or with the wrong tool can damage the lip, causing leaks immediately. Using the wrong thickness shim results in incorrect bearing clearance, leading to excessive wear or overheating. Installing the seal backwards means the lip won’t hold lubricant in properly.

Q: How long can these parts last if installed correctly?

A: With proper installation, clean lubricant, and correct clearance settings, the oil seal can last 5,000–10,000 operating hours, while the metal shims will typically last the life of the assembly unless they are damaged during service.

Q: Can I reuse the old shims?

A: While the shims themselves don’t wear out, it’s best to use new ones if possible, especially if they are bent, scratched, or have been deformed during disassembly. Reusing old shims can lead to incorrect clearances if they are damaged, so always inspect them carefully before reuse. The oil seal, however, should always be replaced with a new one during service.

6. Exhibition and Wearhous

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