A, B, BN, AV Tractor Tune Up Info
Engine Model And Type	C-113 Gas	C-113 Dist.	C-123 Gas Fire Crater Pistons	C-123 Flat Top Pistons
Compression Pressure (at cranking speed)(psi)	102	95	140	107
High Idle (no load) Engine RPM / PTO RPM	1540 / 595	1540 / 595	1540 / 595	1540 / 595
Low Idle (no load) Engine RPM / PTO RPM	525 / 203	525 / 203	525 / 203	525 / 203
Rated Load Speed Engine RPM / PTO RPM	1400 / 541	1400 / 541	1400 / 541	1400 / 541
Horsepower (at load speed) PTO Shaft	16.1	14.2	19.2	17.3
Approximate Fuel Rate (at load speed) gals/hour	1.49-1.56	1.40-1.47	1.50-2.00	1.42-1.91
Firing Order	1-3-4-2	1-3-4-2	1-3-4-2	1-3-4-2
Valve Lash (hot)(inch)
Intake	.014	.014	.014	.014
Exhaust	.014	.014	.014	.014
Spark Plug Gap (inch)	.023	.023	.023	.023
Distributor
Symbol	J	J	J	J
Breaker Point Opening (inch)	.020	.020	.020	.020
Part Number	357935R91	357935R91	357935R91	357935R91
Governor Spring Package	358108R91	358108R91	358108R91	358108R91
Ignition Timing (spark advance BTDC unless otherwise specified) (degrees)
At 400 RPM (+ or - 2 Degrees	0	0	0	0
At high Idle Speed	30	30	30	30
Carburetor Liquid level (inches)
I.H.	-	-	-	-
Zenith	1/2	1/2	1/2	1/2
Carter	-	-	-	-
Marvel-Schebler	3/4	3/4	3/4	3/4
Torque Wrench Settings (foot pounds)
Cylinder Head	80	80	80	80
Manifold	20	20	20	20