Johnson Service Bulletin SB-823 - Shroud Groups

January 15, 1961. Modification of the upper engine cover hook holes on early 1961 V-75 models, including the affected production serial numbers.

Johnson Motors Service Bulletin letterhead
January 15, 1961
Bulletin No.SB-823 Shroud Groups
SUBJECT: Modification of engine covers on 1961 V-75 engines; #378166 for V4S & V4SL-13 engines, #378341 for V4A & V4AL-13 engines.
Figure 1, shroud hook hole after removal of one eighth inch of materialFigure 2, shroud hook hole before modification
FIG.1
FIG.2
After modification of shroud's hook hole.
Before modification of shroud's hook hole.
Removal and replacement of upper engine covers on the first 1961 V-75 engines presented a bit of a problem because the carburetor interfered with the front of the motor cover. Consequently, the rear hook hole has been enlarged by removing 1/8-inch of material as illustrated in figure 1. This provides additional clearance for the hook on the lower cover and thus facilitates easier removal and replacement of the upper cover.
All 1961 V-75 production engines which bear the following, and higher, serial numbers were built with the foregoing modification:
V4S-13 Serial #2196942 V4SL-13 #2198004 V4A-13 #2198842 V4AL-13 #2201110
As 1961 V-75 engines below the listed serial numbers are brought in for service, hook holes in the upper shroud should be modified by filing away 1/8-inch to conform with figure 1. Doing so will then also simplify removal and replacement of covers on these early, 1961 V-75 engines.
JOHNSON MOTORS
W. W. DeWees Service Department
WWDeWees/mg
W. W. DeWees