Non-Overhaul Removal and Replacement
Teledyne Continental Motors, Inc.
TM
10-82
IOF-550 Permold Series Engine Maintenance Manual
1 April 2007
Table 10-10.
IOF-550-B & C Cylinder Assembly Service Limits
Item #
Description
Service
Limit
(inches)
New Part
Minimum
(inches)
New Part
Maximum
(inches)
Top ring gap at 1.00 ± .50 depth (in cylinder barrel) gap 0.028 to
0.044
0.032 0.049
Second ring gap at 1.00 ± .50 depth (in cylinder
barrel) gap
Gap for second ring must be at least .006 larger than gap
for top ring
0.034 to
0.050
0.037 0.054
Third ring gap at 1.00 ± .50 depth (in cylinder barrel)
gap
0.020 to
0.036
0.018 0.035
Fourth ring gap at 1.00 ± .50 depth (in cylinder barrel)
gap
0.015 to
0.031
0.018 0.035
Piston pin in piston (standard or 0.005 inch oversize)
diameter
0.0013L 0.0001L 0.0007L
34 Piston
pin
diameter
1.1245
1.1243 1.1245
Piston pin (0.005 inch oversize) diameter
1.1295
1.1293
1.1295
Piston pin in cylinder end clearance
0.048L
0.0310L
0.0480L
Piston pin in connecting rod bushing diameter
0.0040L
0.0022L
0.0026L
Bushing in connecting rod diameter
0.0050T
0.0025T
0.0050T
Bolt in connecting rod diameter
0.0023L
0.0000L
0.0018L
Connecting rod bearing on crankpin diameter
0.0034L
0.0009L
0.0034L
Connecting rod on crankpin end clearance
0.0160
0.0060
0.0110L
Connecting rod bearing and bushing twist or
convergence per inch of length
0.0010 0.0000 0.0005
Hydraulic tappet in crankcase diameter
0.0035L
0.0010L
0.0025L
Inner valve spring 654442 compressed to 1.230 in.
length load
82 Lbs
70.3 Lbs.
77.3 Lbs.
Inner valve spring 654442 compressed to 1.745 in.
length load
29 Lbs.
32.1 Lbs.
38.1 Lbs.
Outer valve spring 654441 compressed to 1.275 in.
length load
118 Lbs.
101.8 Lbs.
111.4 Lbs.
Outer valve spring 654441 compressed to 1.790 in.
length load
46 Lbs.
49.1 Lbs.
55.1 Lbs.
Installed outer valve spring height
1.791
1.790
1.790
Use corresponding oversize rings, 0.005/0.010/0.015 and
oversize pistons 0.010/0.015
Gap for second ring must be at least .006 larger than gap for top
ring.
T=Tight
L=Loose