Scrapman1959 Posted August 14, 2016 Report Share Posted August 14, 2016 2011 CTLS with 1040 hrs TT. Oil pressure gyrations has been getting steadily worse with today's flight seeing 23 to 55 lbs In wcruise. The needle moves rapidly. Connection on the sender is clean and tight. We did the extra grounding years ago. Engine oil is full as always, and engine sounds normal. Any ideas guys? I was going to replace the oil sending unit for starters. Link to comment Share on other sites More sharing options...
207WF Posted August 18, 2016 Report Share Posted August 18, 2016 Take out the oil pressure regulator ball or cone and look it over. They use to all have balls and later went to springs in order to stabilizer the oil pressure. Having the cone is one of the conditions for the 2000 hour TBO. Over time, the cone can get scored, which might affect the oil pressure. WF Link to comment Share on other sites More sharing options...
Roger Lee Posted August 18, 2016 Report Share Posted August 18, 2016 Actually the mushroom is optional. The TBO is based on the new plug screw and they wanted a new spring. The newer style plug screw has taller sidewalls to prevent the spring from rubbing against the oil pump housing. I do recommend the mushroom though. New engines still come with ball bearings (wish they didn't) Link to comment Share on other sites More sharing options...
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