| Model (Horsepower) | MV16 (16) | M18 & MV18 (18) | M20 & MV20 (20) | |||
| General | Bore x Stroke | 3.125 x 2.750 | 3.125 x 2.750 | 3.125 x 3.062 | ||
| Displacement Cu. In. | 42.18 | 42.18 | 46.98 | |||
| Max. Operating RPM | 3600 | 3600 | 3600 | |||
| Camshaft | End Play | .003/.013 | .003/.013 | .003/.013 | ||
| Connecting Rod | Clearance | Rod to Crankpin (New) | .0012/.0024 | .0012/.0024 | .0012/.0024 | |
| Rod to Crankpin Wear Limit | .0029 | .0029 | .0029 | |||
| Rod to Piston Pin (New) | .0006/.0011 | .0006/.0011 | .0006/.0011 | |||
| Small End I.D. (New) | .6255/.6258 | .6255/.6258 | .7507/.7510 | |||
| Crankshaft | Main | PTO &
Flywheel End O.D. |
New | 1.7412/1.7422 | 1.7412/1.7422 | 1.7412/1.7422 |
| Max Wear Limit | 1.7407 | 1.7407 | 1.7407 | |||
| Max. Out of Round (Sleeve) | .0005 | .0005 | .0005 | |||
| Max. Taper (Sleeve) | .001 | .001 | .001 | |||
| Running
Clearance (Sleeve) |
Max New | .0049 | .0049 | .0049 | ||
| Wear Limit1 | .0059 | .0059 | .0059 | |||
| New Sleeve Bearing I.D. Installed | 1.7439/1.7461 | 1.7439/1.7461 | 1.7439/1.7461 | |||
| Crankpin | New | 1.3738/1.3733 | 1.3738/1.3733 | 1.4998/1.4993 | ||
| Max. Wear Limit | 1.3728 | 1.3728 | 1.4988 | |||
| Max. Out of Round | .0005 | .0005 | .0005 | |||
| Max. Taper | .001 | .001 | .001 | |||
| End Play | .002/.014 | .002/.014 | .002/.014 | |||
| Cylinder Bore | Inside Diameter | New | 3.1255/3.1245 | 3.1255/3.1245 | 3.1255/3.1245 | |
| Max. Wear Limit | 3.128 | 3.128 | 3.128 | |||
| Max. Out of Round | .002 | .002 | .002 | |||
| Max. Taper | .0015 | .0015 | .0015 | |||
| Cylinder Head | Max. Out of Flatness | .003 | .003 | .003 | ||
| Model (Horsepower) | MV16 (16) | M18 & MV18 (18) | M20 & MV20 (20) | |||
| Ignition | Spark Plug | Type2 | RV17C | RV17C | RV17C | |
| Gap | .035 | .035 | .035 | |||
| Modual Air Gap | .008/.012 | .008/.012 | .008/.012 | |||
 Piston |
Service Replacement Sizes | .003 - .010 - .020 - .030 | ||||
| Thrust Face O.D.3 | New | 3.1210/3.1203 | 3.1210/3.1203 | 3.1215/3.1208 | ||
| Max. Wear Limits | 3.1181 | 3.1181 | 3.1186 | |||
| Thrust Face to Bore Clearance (New)1 | .0035/.0052 | .0035/.0052 | .0030/.0047 | |||
| Ring End Gap | New Bore4 | .010/.023 | .010/.023 | .010/.023 | ||
| Used Bore (Max.)4 | .032 | .032 | .032 | |||
| Max. Ring Side Clearance | .006 | .006 | .006 | |||
| Piston Pin | Outside Diameter | .6247/.6249 | .6247/.6249 | .7499/.7501 | ||
| Valves | Guide Reamer Size | .3125 | .3125 | .3125 | ||
| Tappet Clearance (Cold) |
Intake | .003/.006 | .003/.006 | .003/.006 | ||
| Exhaust | Before Serial No. 181600646 |
.016/.019 | .016/.019 | .016/.019 | ||
| Serial No.18100656 to 1917809296 |
.011/.014 | ·011/.014 | .011/.014 | |||
| After Serial No. 1917809296 |
.013/.016 | .013/.016 | .013/.016 | |||
| Minimum Lift (Zero Lash) |
Intake | .274 | .274 | .274 | ||
| Exhaust | .274 | .274 | .274 | |||
| Minimum Valve Stem O.D. |
Intake | .3103 | .3103 | .3103 | ||
| Exhaust | .3088 | .3088 | .3088 | |||
| Nominal Angle
- Valve Seat |
Serial No. 1816500646 & earlier | 45o | 45o | 45o | ||
| Serial No. 181650056 & later | 30o | 30o | 30o | |||
| Guide I.D. Max. Wear Limit1 |
Intake | .005 | .005 | .005 | ||
| Exhaust | .007 | .007 | .007 | |||