Non-Overhaul Removal and Replacement
Teledyne Continental Motors, Inc.
TM
10-86
IOF-550 Permold Series Engine Maintenance Manual
1 April 2007
Table 10-12.
Cylinder Assembly Fits and Limits
Item # Description
Service
Limit
New Part
Minimum
(inches)
New Part
Maximum
(inches)
Rocker arm foot to valve stem (dry valve gear
lash)
0.060 TO
0.2000
0.060 0.200
Pistons, Rings, and Pins
Piston, moly coated (bottom of skirt) in cylinder
diameter
0.0110L 0.0078L 0.0108L
Top piston ring in groove side clearance
0.006L
0.0015
0.0040
Second piston ring in groove side clearance
0.006L
0.0015
0.0040
Third piston ring in groove side clearance
0.0075L
0.0035
0.0055
Fourth piston ring in groove side clearance
0.0100L
0.0060
0.0080
Top ring gap at 1.00
±
0.50 depth (in cylinder
barrel) gap
0.028 TO
0.044
0.032 0.049
Second ring gap at 1.00
±
0.50 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
±
0.50 depth (in cylinder
barrel) gap:
0.020 TO
0.036
0.018 0.035
32
Fourth ring gap at 1.00
±
0.50 depth (in cylinder
barrel) gap
0.015 TO
0.031
0.018 0.035
Piston pin in piston diameter
0.0013L
0.0001L
0.0007L
Piston pin diameter
0.005” oversize
1.1245
1.1295
1.1243
1.1293
1.1245
1.1295
Piston pin in cylinder end clearance
0.0480L
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
Spring Test Data
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 and pistons, 0.005, 0.010, 0.015
Gap for second ring must be at least .006 larger than top ring.
NOTE: T = Tight and L = Loose