Service Bulletin No. 648C
Wastegate Solenoid Valve Inspection and Cleaning
February 20, 2025
TEO-540-C1A
During each scheduled oil change
Added new NOTICE and steps 6 and 7 to the procedure for Helicoil® inspection. Added sentence that S.B provides ICA.
November 2012
IO-540-AG1A5 Series Engine Installation and Operation Manual
60297-45
IO-540-AG1A5 Series
December 2013
November 2014
YO-233-B2A Series Engine Installation and Operation Manual
60297-40 & 60297-40-B
YO-233-B2A Series
February 2008
IO-540-AF1A5 Operation and Installation Manual
60297-33
IO-540-AF1A5
March 2006
October 2006
TIO-540 Series Parallel Valve Cylinder Heads Operator’s Manual
60297-23P & 60297-23P-2
TIO-540 series
April 2007
September 2008
O-320 76 Series Operator’s Manual
60297-22 & 60297-22-1
O-320
June 2006
March 2009
O-540, IO-540 Series Operator’s Manual
60297-10 & 60297-10-3
O-540 and IO-540 series
January 2007
September 2008
O-235 and O-290 Series Operator’s Manual
60297-9 & 60297-9-1
O-235 series, O-290-D series, O-290-D2 series engines
November 2005
January 2013
TIO-540 Series Angle Valve Cylinder Heads Operator's Manual
60297-23A & 60297-23A-3
TIO-540-A1A, -A1B, -A2A, -A2B, -A2C, -F2BD, -J2B, -J2BD, -N2BD,
-R2AD, -S1AD, -U2A, -V2AD, -W2A, -AH1A and -AJ1A.
January 8, 2025
IO-360-A1A, -A1B, -A1B6, -A1B6D, -A1D6, -A2B, -A3B6, -A3B6D, -M1A,
-M1B, -N1A, -P1A -LIO-360-M1A
AEIO-360-A1A, -A1B, -A1B6, -A1D, -A1E, -A1E6, -A2C
IO-390-A1A6, -A1B6, -A3A6, -A3B6
AEIO-390-A1A6, -A1B6, -A3A6, -A3B6
IO-540-V4A5, -V4A5D, -W1A5, -W1A5D, -W3A5D.
