We do not know the cause, it is already bad enough that it did on a so
called rebuilt engine with superior parts.......yeah right (my opinion)
When I finally had someone on the phone, he told me that the bolts must
have had a gas bubble in it.....sure...and micky mouse lives in Orlando LOL
You can see I am really upset with them, so I better shut my mouth, but if
someone is asking I will talk and telling them my opinion.
If you already purchased an engine from them, go to a real shop and let
them take the engine apart LOL The 4p or the legacy are no planes to have
a failing engine on. (unless you are carrying a parachute LOL)