August 10, 1961
Bulletin No. SB-857
Connecting rods
SUBJECT: Connecting rod change:
40 H.P. RD-23 thru RDSL-23 (1961)
75 H.P. V4S-13 thru V4SL-13C (1961)
75 H.P. V4A-13 thru V4AL-13F (1961)
Connecting rods for service on the early 1961 - 40 and 75 h.p. engines have
been superseded by a later type as follows:
Old part no. New Part No. List Price
V-75 engines: #378328 superseded by 378531 $10.75
40 h.p. engines: 378329 superseded by 378541 $10.00
Please change your records accordingly. Prices are subject to the standard
parts discount.
These new rods are of a heavier cross section and use a new type, 12-point
cap screw which facilitates application of the higher torque value specified
for the connecting rod screws on the subject engines. This torque value is
29 to 31 ft. lbs. as specified in Service Bulletin #816, subject: Torque
Values-screws, nuts, bolts and studs.
A 5/16" 12-point deep socket must be used to remove and torque these screws
because the space between the cap and the screw was necessarily reduced in
changing to a screw with a 12-point head.
JOHNSON MOTORS
W. W. DeWees
Service Department
WWD:eb
NOTE: Post on your RD (40 h.p.) and V-74 indexes.