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Bought a $300 borescope for a Cessna 172 and it paid for itself in one job

We had a rough-running engine on a 172 last month and the owner was sure it needed a top overhaul. I got the new borescope and found a single, slightly bent pushrod in cylinder three, clear as day. That saved pulling the jugs for no reason and a huge bill for the owner. Anyone have a favorite brand for these, or a trick for getting a good view past the valves?
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2 Comments
gray_nelson
A slightly bent pushrod is that big a deal? Seems like it could run rough for a while before anything major happens.
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ray_carr
ray_carr1mo ago
Wouldn't that bent pushrod eventually snap and wreck the rocker arm too?
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