S&S Cycle OHV BT and KN-Series 1936-47 Flathead Power Rocker Arms and Rocker Shafts - Manual (Page 2)

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ROCKER ARM REBUILD
S&S® uses specially machined and indexed rocker arm bushings, a rebuild may be more the an average shop or individual can handle, contact S&S
Tech services for more information.
1- To check the wear limits use the chart below.
2- The function of the shaft to bushing tolerance is oil control to the top end, we do not recommend exceeding the wear limit, however, if you are
not experiencing oil flooding to the top end, it is unlikely to need to replace the rocker arm bushings unless they are damaged or show unusual
or uneven wear.
NEW KN ARM REAM NEW KN SHAFT
Top of Tolerance 0.55165 Top of Tolerance 0.5500
Bottom of Tolerance 0.55085 Bottom of Tolerance 0.5495
Total Tolerance 0.0008 Total Tolerance 0.0005
Nominal Diameter 0.55125 Nominal Diameter 0.54975
NOMINAL NEW
0.0015 Nominal Clearance
0.00075 Nominal Gap Around Shaft
LOOSEST NEW
0.00215 Max Clearance
0.001075 Max Gap Around Shaft
TIGHTEST NEW
0.00085 Min Clearance
0.000425 Min Gap Around Shaft
LOOSEST AT WEAR LIMIT
0.00415 Max Clearance
0.002075 Max Gap Around Shaft
ROCKER ARM AND HOUSING INSTALLATION - GENERAL
1- Determine your usage per figures 1, 2 or 3. Assemble rocker arms as shown for your application, note the oil hole end of the shaft must go in
the rocker housing in order to properly oil the top end.
2- Follow installation Figure 1a.