230 Tractor Tune Up Info
Engine Model And Type	C-123 Gas	C-123 Gas Fire Crater Pistons	C-123 Dist.
Compression Pressure (at cranking speed)(psi)	160	142	95
High Idle (no load) Engine RPM / PTO RPM	1980 / 647	1980 / 647	1980 / 647
Low Idle (no load) Engine RPM / PTO RPM	425 / 139	425 / 139	425 / 139
Rated Load Speed Engine RPM / PTO RPM	1800 / 588	1800 / 588	1800 / 588
Horsepower (at load speed) PTO Shaft	27.0	28.2	21.8
Approximate Fuel Rate (at load speed) gals/hour	2.32-2.47	2.50-2.60	2.24-2.37
Firing Order	1-3-4-2	1-3-4-2	1-3-4-2
Valve Lash (hot)(inch)
Intake	.014	.014	.014
Exhaust	.014	.014	.014
Spark Plug Gap (inch)	.023	.023	.023
Distributor
Symbol	X	X	X
Breaker Point Opening (inch)	.020	.020	.020
Part Number	366928R91	366928R91	366928R91
Governor Spring Package	366942R91	366942R91	366942R91
Ignition Timing (spark advance BTDC unless otherwise specified) (degrees)
At 400 RPM (+ or - 2 Degrees	1	1	1
At high Idle Speed	30	30	30
Carburetor Liquid level (inches)
I.H.	-	-	-
Zenith	1/2	1/2	1/2
Carter	-	-	-
Marvel-Schebler	3/4	3/4	3/4
Torque Wrench Settings (foot pounds)
Cylinder Head	80	80	80
Manifold	20	20	20