Editing Engine tuning (section)

===Remanufactured===
{{Unreferenced section|date=December 2018}}
[[Remanufacturing|Remanufactured]] engines are used engines that have been rebuilt to something approximating their manufacturers’ specifications.<ref>{{Cite web|url=https://www.jasperengines.com/remanufactured-engines-faq|title=Remanufactured Gas Engine FAQs {{!}} Jasper Engines|website=www.jasperengines.com|access-date=2019-04-29}}</ref>

A combination of new and used parts are used, with st least the [[cylinder block]] being recycled, typically after having been degreased and steam-cleaned, its coolant passages and oil galleries and passages cleaned, and inspected for cracks and other flaws. High-quality rebuilds will include cylinder honing and typically adjust for standard wear by installing as necessary marginally larger bearings, rings, and other similar wear-prone components, new valve springs and guides, lapping valve seats, and otherwise bringing an engine reasonably close to manufacturer specifications. Better yet remanufacturing may see new pistons and the line-boring of worn crankshaft and camshaft bores to permit larger bushings to be installed.