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Why does the crankshaft still leak oil after replacing the rear oil seal?

2 Answers

LeColin

08/30/25 4:12am

After replacing the crankshaft rear oil seal, oil leakage may still occur because non-petroleum-based lubricant was not used during the installation process of the crankshaft oil seal, or because the installation surface of the rear oil seal did not meet the required specifications. The specific reasons are as follows. Failure to use non-petroleum-based lubricant: If non-petroleum-based lubricant is not used during the installation of the crankshaft oil seal, it can cause the engine oil seal to loosen or even detach (for example, some engine manufacturers may use engine oil as a substitute for the relatively expensive non-petroleum-based lubricant to reduce production costs). Surface not meeting requirements: If the parallelism of the rear oil seal installation surface relative to the rear oil seal seat installation surface does not meet the technical requirements specified in the assembly drawings, it can result in uneven deformation of the rear oil seal lip. This can cause the engine oil seal lip to deform or even the entire oil seal to twist, leading to oil seal damage and oil leakage.

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AbigailDella

09/11/25 8:13am

I recently encountered a similar situation. After replacing the rear crankshaft oil seal on my friend's car in my own garage, I found that it was still leaking oil. This is usually caused by improper installation—such as the oil seal not being fully pressed in, being misaligned, or the retaining groove not being properly seated, resulting in an incomplete seal. Additionally, if the installation process isn't handled carefully, dust or dirt on the sealing surface can affect the performance of the new oil seal. Upon repeated inspection, I realized that improper tool use or excessive hand force had twisted the rubber ring. Car repairs really shouldn't be rushed; you must follow the manual step by step, clean the contact surfaces thoroughly before installation, and ensure a smooth and tight fit. If you mess up, it's best to redo the installation or consult a professional to avoid wasting more time and money. Next time, I'll practice the relevant steps beforehand to avoid repeating similar mistakes. Ignoring an oil leak can also dirty engine components and shorten their lifespan.

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