Why hasn't the engine number changed after replacing the engine?
2 Answers
It is normal for the engine number to remain unchanged after replacing the engine, as newly manufactured engine blocks do not come with pre-assigned numbers. Precautions for engine replacement: 1. Remove the engine after it has cooled down: Removing the engine after cooling ensures easier disassembly and prevents deformation during the process, as high temperatures weaken rigidity and increase the risk of deformation. 2. Avoid deforming the oil pan during removal: Due to the presence of adhesive, the oil pan can be difficult to remove. Avoid prying it forcefully while it's hot to prevent deformation, which could lead to oil leaks after reinstallation. The best method is to use specialized tools for removal. 3. Remove bolts in the correct sequence: Following the proper sequence prevents breakage or deformation during disassembly.
I've worked in auto repair shops for many years and often come across cases where the engine number remains unchanged after a replacement. There are actually several reasons for this: First, the engine number is engraved on the engine block, so a new engine naturally comes with a new number. If the mechanic is lazy or unprofessional, they might not remind you to register the change. Second, many car owners prefer to save themselves the hassle and think that as long as the replacement engine (whether a used one of the same model or a factory-new one) runs fine, there's no need to bother with updating the records, avoiding the trip to the DMV. However, the consequences can be severe—like failing annual inspections due to number mismatches or being denied insurance claims because the database still shows the old number. My advice is to complete the change registration immediately after replacement to avoid fines or other issues. The process is now simpler, and you can even make appointments online. Lastly, some might skip proper procedures to save money or evade taxes, but the risks far outweigh the benefits—safety should always come first.
