| Super C Tractor Tune Up Info |
| Engine Model And Type |
C-123 Gas |
C-123 Dist. |
C-123 Gas Fire Crater Pistons+ |
C-123 Flat Top Pistons+ |
| Compression Pressure (at cranking speed)(psi) |
125 |
95 |
125 |
101 |
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| High Idle (no load) Engine RPM / PTO RPM |
1815 / 593 |
1815 / 593 |
1815 / 593 |
1815 / 593 |
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| Low Idle (no load) Engine RPM / PTO RPM |
425 / 139 |
425 / 139 |
425 / 139 |
425 / 139 |
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| Rated Load Speed Engine RPM / PTO RPM |
1650 / 539 |
1650 / 539 |
1650 / 539 |
1650 / 539 |
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| Horsepower (at load speed) PTO Shaft |
23.7 |
18.9 |
25.6 |
21.0 |
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| Approximate Fuel Rate (at load speed) gals/hour |
2.21-2.34 |
1.98-2.13 |
2.40-2.50 |
2.17-2.29 |
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| Firing Order |
1-3-4-2 |
1-3-4-2 |
1-3-4-2 |
1-3-4-2 |
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| Valve Lash (hot)(inch) |
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| Intake |
.014 |
.014 |
.014 |
.014 |
| Exhaust |
.014 |
.014 |
.014 |
.014 |
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| Spark Plug Gap (inch) |
.023 |
.023 |
.023 |
.023 |
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| Distributor |
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| Symbol |
J * |
J * |
J AB |
J |
| Breaker Point Opening (inch) |
.020 |
.020 |
.020 |
.020 |
| Part Number |
357935R91 |
357935R91 |
372712R91 |
357935R91 |
| Governor Spring Package |
358108R91 |
358108R91 |
372785R91 |
358108R91 |
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| Ignition Timing (spark advance BTDC unless otherwise specified) (degrees) |
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| At 400 RPM (+ or - 2 Degrees |
0 |
0 |
1 |
0 |
| At high Idle Speed |
30 |
30 |
22 |
30 |
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| Carburetor Liquid level (inches) |
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| I.H. |
- |
- |
- |
- |
| Zenith |
1/2 |
1/2 |
1/2 |
1/2 |
| Carter |
17/64 |
17/64 |
17/64 |
17/64 |
| Marvel-Schebler |
- |
- |
- |
- |
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| Torque Wrench Settings (foot pounds) |
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| Cylinder Head |
80 |
80 |
80 |
80 |
| Manifold |
20 |
20 |
20 |
20 |