Yes!  The engine needs to be moved forward several inches.  Are you aware of a Critical service Bulletin on the starter adapter? (CSB02-2C)  Read this bulletin.  If the starter adapter shaft breaks while in flight the scavenge pump stops and all of your oil goes out the exhaust pipes thru the turbo chargers.  The bulletin covers starter adapters with part number on the cover of 642087 and 646757

 

Tom Byrnes Lancair IV N54TB

 

Has anyone ever replaced a starter adapter drive on a TSIO550? (this has the turbo scavenger pump on the back of it)

 

I currently have the problem of the starter motor running but the prop not turning past a compression stroke.  I am told that the whole assembly has to come off the back of the engine and the shaft and spring replaced or rebuilt.  The problem I have on the IV is the distance from the back of the shaft to the firewall is only 2 or 3 inches.  I don't think this is enough room to slide the assembly out.  Will the engine have to be moved forward to remove this assembly?

 

Any help would be greatly appreciated.

 

Dan Reagan

Lancair IVP 570 hours