Overhaul Manual
O-360 and IO-360 Series Engines
17
© March 2005 Superior Air Parts Inc.
72-00-13
Repair Procedures
REPAIR NO. 7
CYLINDER HEAD COOLING FINS
Cylinder Head Cooling Fin Repair
The Superior Vantage O-360 AND IO-360 series
engines utilize cylinders constructed of through-
hardened steel and heads of cast aluminum.
Only the fins on the aluminum head may be
repaired. Cooling fins on the steel barrels may
NOT be repaired by this process.
The cooling fins on these cylinders are finely
balanced to provide appropriate cooling to the
overall cylinder assembly.
CAUTION
: REFER TO THE INSPECTION AND
CHECK SECTION OF THIS MANUAL TO
DETERMINE DAMAGE LIMITS FOR COOLING
FINS ON ANY CYLINDER PRIOR TO
REPAIRS.
Perform repairs as follows:
(1) For cracks in the fin, it is permissible to
drill a 0.19 in diameter hole (a stop drill)
at the end of the crack provided the
crack is at least 0.25 in. from the root of
the fin.
(2) For fins cracked almost all the way
across, it is permissible to remove a
portion of the fin as follows. Refer to
Figure 72-00-15.4.
(a) The maximum material removed is
no more than ½ the total fin width.
(b) No burrs or sharp edges remain.
(c) The minimum filet at the root of the
removed portion of the fin is 0.25 in.
radius. Minimum corner at top of fin
adjacent to the removed portion is
0.50 in. radius.
(3) For damaged, cracked, or broken fins, it
is permissible to perform the following
repairs:
(a) A damaged area may be blended.
The blended area for any one fin
shall not exceed 0.38 in. square
area or 0.38 in. depth.
(b) There may be no more than two
blended areas on one fin.
(c) No more than four blended areas on
the pushrod side of the cylinder
head. No more than six blended
fins on the side opposite the
pushrod side of the cylinder head.
(4) It is recommended that a fluorescent
penetrant inspection be performed upon
completion of any of these repairs.
(a) Pay special attention to the area on
exhaust port side of the cylinder.
(b) Pay special attention to the area
around the lower spark plug
counterbore.
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