47
CLEARANCES AND TOLERANCES - GENERAL
For all compressors, measured in inches
Crankshaft end play
0.002 loose to 0.003 interference
Oil pump end clearance (ring & rotor)
0.001 to 0.003
Piston rod diameter
0.8735 to 0.8755
Cylinder bore diameter (under 1.50”)
0.0015 maximum over nominal
Cylinder bore diameter (1.50” - 3.00”)
0.003 maximum over nominal
Cylinder bore diameter (3.25” - 7.50” )
0.005 maximum over nominal
Cylinder bore diameter (over 7.50”)
0.006 maximum over nominal
HJ Compression Ring radial thickness
0.188 minimum
HL Guide Ring radial thickness (under 8” dia)
0.350 minimum
HL Guide Ring radial thickness (over 8” dia)
0.475 minimum
HM Compression Ring radial thickness
*Contact factory
HN Guide Ring radial thickness
*Contact factory
Compression cylinder wall surface
fi
nish
12-16 RMS
Guide cylinder wall surface
fi
nish
12-18 RMS
* HM & HN style piston rings are available in a wide variety of materials and designs. Contact the factory if you
are unsure if your rings need to be replaced.
MODEL
MINIMUM CLEARANCE
‘A’ & ‘B’ Block, General
0.045
‘C’ Block, General
0.050
‘D’ Block, General
0.055
‘E’ Block, General
0.060
‘F’ Block, General
0.070
AN3A, AN4A, AN6,
WN4A
0.045
AN12, 2AN8
0.045
AN6C, AN10C, AN26
0.050
2AN3C, 2AN10C,
2AN11C, 2AN13C,
2AN17
0.050
WN26
0.050
2WN10C, 2WN17
0.050
AN12D, AN17D, AN44
0.055
2AN10D, 2AN15D,
2AN26, 2AN35, 2AN40
0.055
MODEL
MINIMUM CLEARANCE
WN44
0.055
2WN35, 2WN40
0.055
AN14E, AN20E,
AN27E, AN72E
0.060
2AN61, 2AN76
0.060
WN14E, WN20E,
WN72, WN90
0.060
2WN13E, 2WN17E,
2WN22E, 2WN61,
2WN76
0.060
AN154
0.070
2AN22F, 2AN137
0.070
WN28F, WN35F,
WN44F, WN98
0.070
2WN28F, 2WN150H,
2WN150L
0.070
CLEARANCES - COMPRESSION PISTON TO HEAD
Measured in inches, between top of compression piston and top of cylinder head gasket. Values shown
are minimums, Tole0.015/-0.0. Shims available in 0.010” thickness.