All dimensions in inches.

Model (Horsepower)			M8 (8)	M10 (10)	M12 (12)	M14 (14)	M16 (16)
General	Bore x Stroke		2.94 x 2.75	3.25 x 2.88	3.38 x 3.25	3.500 x 3.25	3.750 x 3.25
	Displacement Cu. In.		18.64	23.85	29.07	31.27	35.90
	Max. Operating RPM		3600	3600	3600	3600	3600
Balance Gear	Shaft O.D.	New	-	.4998/.5001	.4998/.5001	.4998/.5001	.4998/.5001
		Max Wear Limit	-	.4996	.4996	.4996	.4996
	End Play		-	.002/.010	.002/.010	.002/.010	.002/.010
Camshaft	End Play		.005/.010	.005/.010	.005/.010	.005/.010	.005/.010
Connecting Rod	Running Clearance	Rod to Crankpin (New)	.001/.002	.001/.002	.001/.002	.001/.002	.001/.002
		Rod to Crankpin - Max. Wear Limit	.0025	.0025	.0025	.0025	.0025
		Rod to Piston Pin (New)	.0006/.0011	.0003/.0008	.0003/.0008	.0003/.0008	.0003/.0008
	Small End I.D. (New)		.6255/.6258	.8596/.8599	.8757/.8760	.8757/.8760	.8757/.8760
Crankshaft	Main PTO & Flywheel End O.D.	New	1.1811/1.1814	1.5745/1.5749	1.5745/1.5749	1.5745/1.5749	1.5745/1.5749
		Max. Wear Limit	1.1811	1.5745	1.5745	1.5745	1.5745
	Crankpin	New - O.D.	1.1860/1.1855	1.5000/1.4995	1.5000/1.4995	1.5000/1.4995	1.5000/1.4995
		Max. Wear Limit	1.1850	1.4990	1.4990	1.4990	1.4990
		Max. Out of Round	.0005	.0005	.0005	.0005	.0005
		Max. Taper	.001	.001	.001	.001	.001
	End Play		.002/.023	.003/.020	.003/.020	.003/.020	.003/.020
Cylinder Bore	Inside Diameter	New	2.9380/2.9370	3.2515/3.2505	3.3755/3.3745	3.5005/3.4995	3.7505/3.7495
		Max. Wear Limit	2.941	3.254	3.378	3.503	3.753
	Max. Out of Round (I.D.)		.005	.005	.005	.005	.005
	Max. Taper (I.D.)		.003	.002	.002	.002	.002
Cylinder Head		Max. Out of Flatness	.003	.003	.003	.003	.003
Ignition	Spark Plug	Type2	RCJ-8	RH-10	RH-10	RH-10	RH-10
		Gap	.025	.025	.025	.025	.025
	Module Air Gap		.012/.016	.012/.016	.012/.016	.012/.016	.012/.016
Model (Horsepower)			M8 (8)	M10 (10)	M12 (12)	M14 (14)	M16 (16)
All Pistons	Service Replacement Sizes		.003 - .010 - .020 - .030
Piston	Thrust Face O.D.3	New	2.9297/2.9281	3.2432/3.2413	3.368/3.365	3.4941/3.4925	-
		Max. Wear Limits	2.925	3.238	3.363	3.491	-
	Thrust Face to Bore Clearance (New)1		.007/.010	.007/.010	.007/.010	.007/.010	-
	Ring End Gap	New Bore	.007/.017	.010/020	.010/.020	.010/.020	-
		Used Bore (Max.)	.027	.030	.030	.030	-
	Max. Ring Side Clearance		.006	.006	.006	.006	-
Piston	Thrust Face O.D.4	New	-	-	-	-	3.7465/3.7455
		Max. Wear Limits	-	-	-	-	3.7435
	Thrust Face to Bore Clearance (New)1		-	-	-	-	.0030/.0050
	Ring End Gap	New Bore5	-	-	-	-	.010/020
		Used Bore (Max.)5	-	-	-	-	.030
	Max. Ring side Clearance		-	-	-	-	.004
Piston	Thrust Face O.D.4	New	2.9329/2.9336	-	3.3700/3.3693	3.4945/3.4938	3.7433/3.7426
		Max. Wear Limits	2.9312	-	3.3673	3.4918	3.7406
	Thrust Face to Bore Clearance (New)1		.0034/.0051	-	.0045/.0062	.0050/0067	.0062/.0079
	Ring End Gap	New Bore5	.010/.023	-	.010/.020	.010/.020	.013/.025
		Used Bore (Max.)5	.032	-	.030	.030	.033
	Max. Ring Side Clearance		.006	-	.006	.006	.004
Piston Pin	Outside Diameter		.6247/.6249	.8591/.8593	.8752/.8754	.8752/.8754	.8752/.8754
Valves	Guide Reamer Size		.3125	.3125	.3125	.3125	.3125
	Tappet Clearance (Cold)	Intake	.006/.008	.008/.010	.008/010	.008/.010	.008/.010
		Exhaust	.017/.019	.017/.019	.017/.019	.017/.019	.017/.019
	Minimum Lift (Zero Lash)	Intake	.2718	.318	.318	.318	.318
		Exhaust	.2482	.318	.318	.318	.318
	Minimum Valve Stem O.D.	Intake	.3103	.3103	.3103	.3103	.3103
		Exhaust	.3074	.3074	.3074	.3074	.3074
	Nominal Angle Valve seat		45o	45o	45o	45o	45o
	Guide I.D.Max. Wear Limit1	Intake	.006	.006	.006	.006	.006
		Exhaust	.008	.008	.008	.008	.008

¹Subtract O.D. of inner part from I.D. of outer part.
²Champion spark plugs or equivalent.
³Measure just below oil ring and at right angles to piston pin.
⁴Measure 1/2" above the bottom of the piston skirt
⁵Top and center compression rings

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