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Old 20th Mar 2017, 11:24
  #65 (permalink)  
Forfoxake
 
Join Date: Jul 2014
Location: Scotland
Posts: 277
Turning the prop backwards (over one or more revolutions) on Rotax 912/914 engines can apparently cause ingestion of air into the valve train and require a venting check:

SB-912-036
Service Bulletin: Inspection for correct venting of the oil system for Rotax engine type 912 and 914 (series)
SB-912-036 R1 SB-914-022 R1
Cited in Compliance 1.5 – “engines which have had the prop spun for more than 1 turn in reverse direction allowing air to be ingested into the valve train.”

and

SI-04-1997
Service instruction: Venting of lubrication system for Rotax engine type 912 and 914 (series) SI-04-1997 R3
Cited in 1.3 Reason – “and/or had the prop spun in the reverse direction allowing air to be ingested into the valve train.”
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