Johnson Service Bulletin SB-881 - Propeller Specifications

Issued December 13, 1961, this bulletin lists the factory slip torque specifications for propellers tested with fixture 378448. The original bulletin is reproduced below.

Johnson Motors Service Bulletin letterhead
December 13, 1961Bulletin No. SB-881
Propeller Specifications

SUBJECT: Propeller slippage tests;
10, 18, 25, 28, 30, 35, 40, 50 and 75 h.p.

Following are the torque values required to test propellers for hub slippage using propeller torque fixture #378448, (refer Service Bulletin #SB-880). In cases of slippage, these values will serve as a "sales clincher" by demonstrating to the customer that his slipping propeller is a cause of his outfit performing inefficiently, and should be replaced with a new one.

H.P.MODELPROP. NO.SLIP TORQUE
FT. LBS.
10QD series27758565 - 100
10QD series27759565 - 100
10QD series37708384 - 104
10QD series37763584 - 104
15FD seriesAll65 - 100
18FD seriesAll65 - 100
25RD seriesAll150 - 210
28RX seriesAll150 - 210
30RD seriesAll150 - 210
35RD seriesAll150 - 210
40RD seriesAll150 - 210
40RK seriesAll150 - 210
50V-4 seriesAll315 - 345
75V-4 seriesAll240 - 290
JOHNSON MOTORS
W. W. DeWees
W. W. DeWees
Service Department

WWD:eb

NOTE: Post on all indexes, QD thru V-75

Related information

SB-880 - Propeller Torque Fixture Assembly

Tool 378448 - Propeller Torque Fixture

Related factory references