Tune up Information
For International Tractors 1924-1950
 
 
Model Max. rpm Compression at cranking speed   (psi) Intake Valve Clearance  Exhaust Valve Clearance Static Timing Running Timing Magneto Gap Champion spark plug AC spark plug Plug Gap
Regular 1290    .009 H .009 H TDC 30 BTDC .013 20 77 .023- 
.027
F-20 1325   .009 H .009 H TDC 35 BTDC .013 1 Com 77 .023- 
.027
T-20 1360   .016 H .016 H TDC 35 BTDC .013 1 Com 75 .023- .027
F-12 W-12 1450   .013 H .013 H TDC 35 BTDC .013 1 Com 75 .023- 
.027
F-14 W-14 1800   .013 H .013 H TDC 35 BTDC .013 1 Com 75 .023- .027
10-20 1130   .011 H .011 H TDC 35 BTDC .013 20 77 .023- 
.027
15-30 22-36 1150   .014 H .014 H TDC 35 BTDC .013 20 77 .023- .027
W-30 1300   .017 H .017 H TDC 35 BTDC .013 1 Com 77 .023- 
.027
F-30 1275   .017 H .017 H TDC 35 BTDC .013 1 Com 77 .023- 
.027
Cub 1800 106 .013 C .013 C TDC 13 BTDC .013 8 Com 87 .025
A B  1540 124 .014 .014 TDC 35 BTDC .013 8 Com 87 .025
C 1815 124 .014 .014 TDC 35 BTDC   8 Com 87 .025
H W-4 T-4 1815 121 .017 .017 TDC 35 BTDC .013 8 Com 87 .025
M W-6 T-6 1595 119 .017 .017 TDC 35 BTDC .013 8 Com 87 .025
MD WD-6 TD-6 1610 490 .002-.004 .002-.004 6.5 ATDC 12.5 SI .013 49 18 .020- .025
W-9 1650 109 .017 .017 TDC 35 BTDC .013 0 Com 75 .025
WD-9  1665 492 .002-.004 .002-.004 6.5 ATDC 12.5 SI .013 49 18 .020- .025
T-9 1540 120 .002-.004  .002-.004 TDC 35 BTDC .013 8 Com 87 .020- .025
TD-9 1555 492 .002-.004 .002-.004 6.5 ATDC 12.5 SI .013 49 18 .035- .040
TD-14 1555 570 .002-.004 .002-.004 15 ATDC 13 SI .013 49 18 .035- .040
TD-18 1500 565 .002-.004 .002-.004 4 ATDC 13 SI .013 49 18 .035- .040
TD-24 1555 530 .002-.004 .002-.004   10.5 SI .013 49 18 .035- .040
TDC = Top Dead Center A = After B = Before SI = Start of Injection H = Hot  C = Cold
This was compiled from several service tables and manuals.  Be careful when making these adjustments if not done correctly damage to you or your tractor may result.  If it is a hand crank model it is best to pull or belt start it first.  The spark plug numbers are original if the tractor is only used for light work a  hotter plug will work better.
 Klossner@antiquetractors.com
 Go to the Spark Plug Cross Reference Page
 Return to the International Page