Johnson Service Bulletin SB-890 - Testing Coils

February 14, 1962. Stevens coil and condenser tester specifications, 1949 through 1962 engines.

Johnson Motors Service Bulletin letterhead
February 14, 1962
Bulletin No. SB-890 Ignition Systems
SUBJECT: Testing coils on old style Stevens Coil & Condenser Tester containing ammeter, neon glow tube, and spark gap electrodes; 1949 thru 1962 engines.
This bulletin is for the benefit of those dealers who are using the subject Stevens Coil and Condenser Tester.
These specifications apply only when using a 1/4" spark gap. When testing coils on armature plates, condensers must be disconnected from coils or points.
Condensers are tested as described on page 23 of General Service Manual #302231, or as contained in the instructions provided with each testing unit.
H.P.ENGINE MODEL NO.PART
NO.
SWITCH
SETTING
AMPERAGE
With Heels
Without
Heels
2.5HD(L)-25375189B1.5 to 2.0See footnote*
2.5HS(L) & HD(L)-26580118A2.0 to 2.5
3JW(L)-10 thru 17580118A2.0 to 2.5
5TD(L)-20375189B1.5 to 2.0See footnote*
5TN(L)-25 & 26375189B1.5 to 2.0
5TN(L)-27 & 28580118A2.0 to 2.5
5.5CD(L)-10 thru 19580118A2.0 to 2.5
7.5AD(L)-10 thru 12580118A2.0 to 2.5
10QD(L)-10 thru 11580040B1.6 to 2.0
10QD(L)-12 thru 23580118A2.0 to 2.5
15FD(EL)-10,10L & 10S580118A2.0 to 2.5
16SD(L)-15 & 20375102B.8 to 1.21.0 - 1.3
18FD(EL)-11,11K & 12;580197B1.3 to 1.8
FD(L)-13 thru 15F
18FD(L)-16580197##B1.3 to 1.8
580416##A2.0 to 2.5
22PO(L)-1572-852B.8 to 1.31.0 - 1.5
25RD(L)-10 thru 17S;
RDE(L)-16 thru 17S580118A2.0 to 2.5
28RX(L)-10C580416A2.0 to 2.5
30RD(EL) thru RJE(L)-18 thru 18C580197B1.3 to 1.8
35RD(EL) thru RJE(L)-19 & 19M;
RD(EL)-19C; RDS(L)-20;
RD thru RDSL-21 & 21B580197B1.3 to 1.8
40RD(SL)-22 thru 23580197B1.3 to 1.8
40RD(L) thru RK(L)-24580416A2.0 to 2.5
50V4(SL)-10 thru 11B580243B1.5 to 2.0
75V4S(L)-12 thru 14580243B1.5 to 2.0
75V4A(L)-13 thru 14378231#A1.0 to 1.5
over
SB-890 Page 2
* Coil must be mounted on a laminated core to test.
# Does NOT require special test adaptors of any kind with the subject test equipment. See Service Bulletin #SB-844 for recommended procedures to test on or off the engine.
## Either the 580197 or 580416 coils will be found in matched pairs on early 1962 - 18 h.p. engines. Coil identification can be determined as follows: 580197 has blue tinted plastic insulation, 580416 has purple tinted plastic insulation.
JOHNSON MOTORS
W. W. DeWees
W. W. DeWees Service Department
WWD:eb
NOTE: Post on your Miscellaneous index.

Revised edition

SB-890 Revised (November 7, 1962) - Updated 1949-1963 ignition coil testing specifications

The revised edition instructs dealers to destroy the February 14, 1962 original. Both are retained for historical reference.