An O-ring should be identified by its groove and service conditions, not color alone. This listing identifies Shangchai reference 3S5496, but gives no cross-section, material or installation location. Confirm the number and seal position from the original part and the engine catalogue.
Record the groove, not just the removed ring
Measure the groove and mating parts with suitable tools after cleaning them. A removed O-ring may have stretched, flattened or swollen, so its present dimensions may not match the new-part specification. Check the specified cross-section and material for the fluid and temperature conditions in the service information. Do not infer material from the ring color.
Inspect the groove for burrs, corrosion and old sealant. Clean it without scratching the sealing face. During installation, use the approved lubricant and method for the assembly, and make sure the ring is not twisted or pinched. The required lubricant and fit details are not stated in this listing.
How to request 3S5496
Provide the engine model and serial, the location where the ring is fitted, the old number and a clear photo of the groove. Ask the supplier to confirm material and dimensions in writing. The 2W6134 O-ring page is a different reference; do not substitute it based on appearance.
Frequently asked questions
Does 3S5496 identify the ring material?
No material is stated here. Confirm it for the fluid and assembly.
Can I measure the old ring and order that size?
Use the groove and catalogue specification; a used ring may have changed shape.
Is color a reliable way to select an O-ring?
No. Confirm the part number, dimensions and material specification.
