| Starting Serial Number: | Six (Model 54)... 5096001 - 5120000 |
| Dictator Eight (Model 61)... 9000001 - 9015000 | |
| Commander Eight (Model 70)... 8025001 - 8036000 | |
| President Eight (Model 80)... 7031001 - up | |
| President Eight (Model 90)... 6022001 - 6025000 |
Location: On frame under left front fender.
Jump to:
General Specs | General Engine Specs | Engine Tune Up Specs | Engine Clearances | Lube Chart
General Specifications:
| Model | Wheelbase (In.) | Shipping Weight (lb.) | Tire Size (In.) |
| 54 | 114 | 2900 | 5.25-19 |
| 61 | 114 | 3095 | 5.25-19 |
| 70 | 124 | 3525 | 6.00-19 |
| 80 | 130 | 4250 | 6.50-19 |
| 90 | 136 | 4275 | 6.50-19 |
General Engine Specifications:
| Model | # of Cyl - Bore & Stroke | Displacement | Compression | Max Brake H.P. | H.P. per Cubic In. | # of Main Bearings |
| 54 | 6 - 3 1/4 x 4 1/8 | 205.3 | 5.20 | 70@3200 | .338 | 4 |
| 61 | 8 - 3 1/16 x 3 3/4 | 221.0 | 5.00 | 81@3200 | .367 | 9 |
| 70 | 8 - 3 1/16 x 4 1/4 | 250.4 | 5.20 | 101@3200 | .403 | 9 |
| 80 | 6 - 3 1/2 x 4 3/8 | 337.0 | 5.10 | 122@3200 | .362 | 9 |
| 90 | 6 - 3 1/2 x 4 3/8 | 337.0 | 5.10 | 122@3200 | .362 | 9 |
top
Engine Tune-Up Specifications:
| Model | Plug Type | Plug Gap | Point Gap | Dwell | Ign. Timing | Ign. Timing Mark | Compression | Inlet Tappet | Exhaust Tappet |
| 54 | Champ - C4 | .025 | .018-.024 | 36 | M-15 A-28 |
Note1 | 104@1200 | .004C | .007C |
| 61, 70 | Champ - 2 | .025 | .018-.024 | 34 | M-25 A-20 |
Note2 | 104@1200 | .004C | .007C |
| 80, 90 | Champ - 2 | .025 | .018-.024 | 49 | M-25 A-17 |
Note2 | 104@1200 | .004C | .007C |
Note1: With spark control button pushed in for full advance, breaker points open when the punch mark 1/2" ahead of the DC1-6 (or UDC1-6) mark aligns with the peep hole pointer.
Note2: With spark control fully advanced, stationary breaker points open when the punch mark 1" ahead of the 1-8TDC mark on the flywheel aligns with the peep hole pointer.
topEngine Clearances:
| Model | Piston Top | Piston Bottom | Ring Gap Oil | Ring Gap Comp. | Wristpin | Rod Clearance | Rod Endplay | Thrust on # | Main Endplay | Main Clearance |
| 54 | .012 | .003 | .013 | .013 | .0002 | .0008 | .004 | 3 | .003 | .001 |
| 61, 70 | .020 | .0015 | .013 | .013 | .0002 | .0008 | .003 | 1 | .003 | .001 |
| 80, 90 | .028 | .0015 | .013 | .013 | .0001 | .0008 | .0015 | 1 | .003 | .001 |
Lubrication Chart:
| Engine | Transmission | Rear Axle | ||||||||||
| Model | Temp | SAE # | Temp | SAE # | Temp | SAE # | Rear Wheel Bearings | Front Wheel Bearings | Steering Gear | Clutch Release Bearing | Water Pump & Fan | |
| 54 | Above 90 | 40 | Summer | 160 | Summer | 160 | Pack w/Cup Grease | Pack w/Cup Grease | Chassis Lube | 160 Oil | Fan: 30 Oil | |
| 45 - 90 | 30 | Winter | 90 | Winter | 90 | |||||||
| 10 - 45 | 20 | |||||||||||
| Below 10 | 10 | |||||||||||
| 61 | Above 90 | 40 | Summer | 160 | Summer | 160 | Pack w/Cup Grease | Pack w/Cup Grease | Chassis Lube | Cup Grease | Fan: 30 Oil | |
| 45 - 90 | 30 | Winter | 90 | Winter | 90 | |||||||
| 10 - 45 | 20 | |||||||||||
| Below 10 | 10 | |||||||||||
| 70 | Above 90 | 40 | Summer | 160 | Summer | 160 | Pack w/Cup Grease | Pack w/Cup Grease | Chassis Lube | 160 Oil | Fan: 30 Oil | |
| 45 - 90 | 30 | Winter | 90 | Winter | 90 | |||||||
| 10 - 45 | 20 | |||||||||||
| Below 10 | 10 | |||||||||||
| 61 | Above 90 | 40 | Summer | 160 | Summer | 160 | Pack w/Cup Grease | Pack w/Cup Grease | Chassis Lube | 160 Oil | Fan: 30 Oil | |
| 45 - 90 | 30 | Winter | 90 | Winter | 90 | |||||||
| 10 - 45 | 20 | |||||||||||
| Below 10 | 10 | |||||||||||