facthunter Posted March 3 Posted March 3 Those Nikasil Bores don't give any trouble but rings, valve guides, stems and springs are worth checking. Rust pit on a valve spring will cause breakage later. Don't think I'd split the cases without reason . Is it the earlier 80 HP motor without the Red gear clutch? Nev 1
Marty_d Posted March 3 Posted March 3 I remove the plugs, spray Inox in the cylinders and turn the prop to get the Inox around everywhere. This happens once a month. I also had a pet bed heater under the motor in really cold winters. No it's not the 80hp, 100hp ULS. 2 hours ago, facthunter said: You may not wish to bother with this at this time.Nev ??? Not quite sure what you mean there Nev. 1
facthunter Posted March 3 Posted March 3 At the Moment the engine would not be your first priority? It will fly OK even if it has square corners. Nev 1
fallowdeer Posted March 3 Posted March 3 A 2000hr 912 that had those hours piled on quickly in a flight school while being well maintained is likely to be a better bet than a 12 year old model with 350 hours from what I’ve observed. 4
facthunter Posted March 3 Posted March 3 (edited) I think that would vary with individual cases. I'd' be replacing the exhaust valves on a 2000 hour ULs. and probably the rings . Nev Edited March 3 by facthunter 1
fallowdeer Posted March 3 Posted March 3 Each to his own. My opinions based on direct observations and conversations with probably the two most experienced 912 engineers in NZ, one of whom has been selling and servicing 912s for well over twenty years. 3
BrendAn Posted March 3 Posted March 3 45 minutes ago, facthunter said: I think that would vary with individual cases. I'd' be replacing the exhaust valves on a 2000 hour ULs. and probably the rings . Nev i know of a 912 uls that has 3600 hrs in a flying school tecnam. he ran it on condition to 3600 . never had a problem , never pulled apart. still passing leakdowns . he was allowed to run on conditon because the tecnam has a type certificate. 2 2
facthunter Posted Thursday at 03:50 AM Posted Thursday at 03:50 AM If you do what I suggest the Motor will stay cleaner internally and therefore wear less and the EXvalves are the Hardest worked Part. I don't see much point in setting some record for Longest use. It's not a Sydney taxi. It's an Aeroplane. Nev 1
facthunter Posted Thursday at 04:08 AM Posted Thursday at 04:08 AM Anyhow everything fatigues. New is best. Nev
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