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


 Use Chart 2 below.
 
 
 
 

S&S® Pinion Shaft Main Bearing Fitting Charts
For 1987 and later style bearings
EXAMPLE: Pinion bearing race inside diameter is 1.7510”. Pinion shaft bearing surface diameter is 1.2499”. 1.7510” minus 1.2499” is .5011”. Dierence of
.5011” splits “.5009 to .5013” range in third row exactly. Corresponding “BLUE” color code in right column should be used. Notice that .5011” ts in several
range groups. Try to select group where dierence falls closest to middle of range. If you are not sure, select color that corresponds with group closer to
top of chart. This will provide slightly looser bearing t and help prevent bearing seizure. Selecting next color up on chart may also be done if looser t is
desired for competition applications.
 
 


 
* All reference to Harley-Davidson® part numbers is for identication purposes only. We in no way are implying that any of S&S® Cycle’s products are
original equipment parts or that they are equivalent to the corresponding Harley-Davidson® part number shown.
NOTES
It is important to conrm ywheel diameter is correct for crankcases. Flywheels that are too large will not t in crankcases. Flywheels that are too small

will leave too large a gap between ywheels and oil scraper resulting in poor oil scavenging and possible oil consumption problems. If ywheel diameter
is smaller than diameter crankcases were machined for, scraper should be built up to provide proper clearance at rim of ywheels.
Clearances between crankpin nut - case and connecting rods - case must be checked by engine builder during assembly. Engine damage resulting from

improper clearances is not covered under warranty.
Abnormal contact between moving engine components due to improper clearances may cause premature wear, damage or failure of
these parts or other components.
 





 





S&S 31-4018



S&S 31-4018









S&S 31-4016














S&S 31-4018



S&S 31-4017

Chart 1
Chart 2
CAUTION