Hank Maierhoffer Posted July 6, 2020 Report Posted July 6, 2020 Have an M20K with the Continental. The engine appears high with cowl and spinner on. The spinner is not flush around the cowl bowl. I have looked in the service and parts manual for information regarding shimming the engine but see no data about this. Any suggestions were to find approved info?
anthonydesmet Posted July 6, 2020 Report Posted July 6, 2020 There are a couple of rubber bumpers on the front lower side of the engine mount that are there to provide proper clearance of the cowl around the engine. I had to replace my bumpers and have the mounts adjusted due to my cowl being misaligned as you stated. Other than looking off center like yours I also had some cowl rubbing/too close to the turbo and we found some hot spots.
carusoam Posted July 7, 2020 Report Posted July 7, 2020 Welcome aboard Hank! Summary.... 1) Rubber parts compress over time... engine mounts do this... Small rubber donuts between the engine and the mounting frame... 2) Some rubber parts fail... hard to find the split in the rubber donut without removing it.... 3) Some cowling parts age poorly over the many decades... it is possible that the cowl is moving.... 4) When the engine sags, then fixes itself.... then sags again.... this is a sign that the tubular engine mount may be broken.... check all the welds, and tubes carefully... When you get a chance, add some data to your avatar... location and airframe are always appreciated... Best regards, -a-
Guest Posted July 7, 2020 Report Posted July 7, 2020 (edited) From the maintenance manual here is the engine mount stack up. It’s possible that they’re installed wrong. Clarence Edited July 7, 2020 by M20Doc
29-0363 Posted July 7, 2020 Report Posted July 7, 2020 I spoke with someone at the factory way back around 2000, explaining my spinner was about 3/8" lower than the cowl (on the ground). It was explained to me the engine naturally sagged on the mounts when stopped on the ground, but when airborne under power the engine rises and aligns the spinner and cowl.
Hank Maierhoffer Posted July 7, 2020 Author Report Posted July 7, 2020 Thanks for all the replies. Actually the engine is high at the spinner to cowl area. I did check the cowl alignment and the cowl bumpers. New Barry mounts were installed about 6 years ago. I don't think it is stacked correctly as per M20DOC's post.
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