Signs that an engine overhaul is needed

Replacing or having your engine overhauled can be one of the most costly and time consuming projects that you may go through as an aircraft owner.

But what are the signs that indicate it’s time for such a big engine job to be done?

• Metal in the filter – Cutting open an oil filter during routine oil changes can be revealing. While it’s very much within spec to find some metal lingering about within the filter, too much may be a sign that there are serious internal engine problems ahead. A certified A&P can help determine how much is acceptable based on your engine.
• TBO, or Time Between Overhaul is a recommendation that each engine manufacturer provides as a baseline for overhauls based on hours, generally between 1800-2000 hours. However, inspections that fall under Part 91 requirements state that if everything looks good after inspection there is no mandatory engine overhaul required. We have some customers with Hobbs Meter readings over 3,000. The rule of thumb here from most technicians is that if it’s not broke, don’t fix it. Unless your plane is ‘For Hire’, then the manufacturer’s TBO time must be followed.
• Low cylinder compression PLUS high time on engine – Replacing just the cylinder or cylinders that have low compression is a common practice. Although if your engine is already well beyond it’s TBO time AND compression is low, the cost of replacing just the cylinders may not be justified against a complete engine overhaul. In this case an A&P that you trust can give you the honest assessment that you deserve.

If your engine shows signs that an overhaul or replacement is needed, our team at Sky Manor Air Repair can help walk you through the process of understanding all your options and related costs.

Contact our maintenance team to learn more.