The International Cessna^® 170 Association

As a prospective C-170 buyer, I'm interested in the normal TBOH for the engine found on these airplanes. I realize that other factors may play, but I'm just looking for a yardstick.

Thanks in advance for whoever replies.

From what I've gathered the 0-300 (c-145) bottom end will make TBO plus (1800) easily with reasonable care and frequent operation. Like most other aircraft engines the valve train and cylinder heads are the weakest link and probably won't make TBO. My feeling is about 1200 is what you'll get on the valves and heads. Some will get more some will get less. Your mileage will vary.

I consider the 0-300 (c-145) as reliable and durable as any other aircraft engine. Like any engine the way it is maintained and frequent operation seem to have more to do with it's longevity than anything else. An unused idle engine will not last.

ghostrider wrote:As a prospective C-170 buyer, I'm interested in the normal TBOH for the engine found on these airplanes. I realize that other factors may play, but I'm just looking for a yardstick.

Thanks in advance for whoever replies.

Teledyne Continental Service Information Letter SIL-98-9 applies, and lists the C-145/O-300 engine TBO as 1800 hours or 12 years. This letter cautions about infrequent use, non-compliance with TCM maintenance procedures, and use of non-TCM parts, as well as aircraft used in parachute jumping, glider/banner towing, etc.
Keep in mind that a manufacturer's stated/recommended TBO is merely their claim that no matter how well the engine is running at that point, the mfr position is it needs overhaul. In other words, in the view of the mfr, TBO is a LIMIT...not a life expectancy.