October 24, 1961
Bulletin No. SB-875
Special Tools
SUBJECT: Modification of propeller straightening fixtures,
#376934 for 37636 Prop. (9¼ x 11)...
18 h.p. FD(L)-11 thru 16;
18 h.p. FDE(L)-11 & 12.
#376951 for 277617 Prop. (10 3/8 x 13¼)...
35 h.p. RD(L)-19 thru RDS(L)-21B;
40 h.p. RD(L) & RDS(L)-22 thru 24.
There have been complaints that the subject propeller straightening fixtures did not
properly fit the corresponding propellers. In checking for this possibility, it was
found that there was an interference point between the radius at the base of the prop-
eller blade and the fixture. Changes have accordingly been made to the fixtures to
correct this problem. Future shipments from the parts depot will therefore consist
of the modified fixtures. Even though modified, fixture part numbers remain unchanged.
Fixtures currently in the possession of dealers can be readily modified by simply grind-
ing the specified radius on the corresponding fixture. Figures 1 and 2 illustrate
BEFORE and AFTER modification of fixture 376934 for the 18 h.p. engines, but they are
nonetheless also typical of the modification for fixture 376951. The important differ-
ence is in the radius ground on each fixture as follows:
Fixture #376934 - Grind 3/8 inch radius
Fixture #376951 - Grind 1/2 inch radius
FIGURE 1
over
