MODEL HD260
CYLINDER HD260
| Type | Size | Maximum Taper | Above Block |
| Wet Sleeve | 3.877 | .008 | .004 |
| - | 3.875 | - | .0015 |
PISTON HD260
| Pin Hole Diameter | Ring Groove Diameter | Ring Groove Width | Fit In Cylinder Bore | ||||||||
| 1st | 2nd | 3rd | 4th | 5th | 1st | 2nd | 3rd | 4th | 5th | ||
| 1.250 | 3.444 | 3.497 | 3.497 | 3.457 | 3.497 | .129 | .128 | .128 | .253 | .1905 | .004X1/2"Gage |
| 1.2498 | 3.434 | 3.487 | 3.487 | 3.447 | 3.487 | .128 | .127 | .127 | .252 | .1895 | 5-10 lbs. |
| Diameter At Bottom Of Piston Skirt | |||||||
| A3 | A2 | A1 | A | AA | B | BB | C |
| 3.86995 | 3.87045 | 3.87095 | 3.87145 | 3.87195 | 3.87245 | 3.87295 | 3.87345 |
| 3.87045 | 3.87095 | 3.87145 | 3.87195 | 3.87245 | 3.87295 | 3.87345 | 3.87395 |
PISTON PIN HD260
| Pin Diameter | Diameter Hole In Rod | Finished Bushing Diameter |
Pin Fit In Piston |
Clearance In Bushing |
|
|
Possible |
Desired |
||||
| 1.2500 | 1.3753 | 1.2504 |
Lite Push Fit With Piston Heated To 160°F |
.0002 | .0004 |
| 1.2498 | 1.3743 | 1.2502 | .0006 | - | |
PISTON RINGS HD260
| Type Of Ring | Groove Position | Width | Thickness | Gap Clear | Side Clear |
| Taper Face | 1 | .124 | .194 | .017 | .0055 |
| Compression | .123 | .184 | .007 | .004 | |
| Taper Face | 2 | .124 | .167 | .017 | .005 |
| Compression | .123 | .157 | .009 | .003 | |
| Taper Face | 3 | .124 | .167 | .017 | .0045 |
| Compression | .123 | .157 | .009 | .003 | |
| Ventilated | 4 | .2490 | .167 | .017 | .0045 |
| Oil Control | .2485 | .156 | .007 | .003 | |
| Ventilated | 5 | .1865 | .167 | .017 | .0045 |
| Oil Control | .1860 | .157 | .007 | .003 |
VALVE GUIDE HD260
| Outside Diameter | Stem Hole Diameter | Valve Seat Face To Top Of Guide | Valve Stem Clearance Limits |
Desired Stem Clearance |
||||
|
Intake |
Exhaust | Reamed | Intake | Exhaust | Intake | Exhaust | Intake | Exhaust |
| .752 | .752 | .4365 | 2 9/64 | 1 19/64 | .0021 | .005 | .0015 | .004 |
| .751 | .751 | .436 | - | - | .0008 | .0035 | - | - |
INTAKE VALVE HD260
| Stem Diameter | Maximum Stem Wear | Minimum Margin | Face Angle | Clearance Limits | Desired Clearance |
| .4352 | .002 | 1/32 | 44° | .0021 | .0015 |
| .4344 | - | - | - | .0008 | - |
EXHAUST VALVE HD260
| Stem Diameter | Maximum Stem Wear | Minimum Margin | Face Angle | Clearance Limits | Desired Clearance |
| .4325 | .002 | 1/32 | 44° | .005 | .004 |
| .4315 | - | - | - | .0035 | - |
VALVE SEAT (INTAKE) HD260
| Seat Angle | Seat Width | Stone Size | Narrow Stone | Stone Diameter |
| 45° | 3/32 | 45° | 15°-70° | 1 5/8 |
VALVE SEAT (EXHAUST) HD260
| Seat Angle | Seat Width | Stone Size | Narrow Stone | Stone Diameter |
| 45° | 3/32 | 45° | 15°-70° | 1 1/2 |
VALVE SPRING HD260
|
Free Length |
Valve Closed |
Valve Open |
||
| Spring Length | Spring Load | Spring Length | Spring Load | |
| 2 3/8 | 1 7/8 | 64-58 lbs. | 1.521 | 115-113 lbs. |
CAMSHAFT HD260
|
Bearing Journal Diameter |
Tappet Hole Diameter |
Tappet Diameter |
Clearance Limits |
End Play |
||
| Front | Center | Rear | ||||
| 1.9965 | 1.7465 | 1.6840 | 1.0005 | .9985 | .003 | .009 |
| 1.9960 | 1.7460 | 1.6835 | 1.000 | .9975 | .0015 | .005 |
CAMSHAFT BEARINGS HD260
|
Inside Diameter |
Clearance Limits |
Oil Pump Backlash |
||||
| 1 | 2 | 3 | 1 | 2 | 3 | |
| 2.000 | 1.750 | 1.6875 | .004 | .004 | .004 | .010 |
| 1.999 | 1.749 | 1.6865 | .0025 | .0025 | .0024 | .008 |
CONNECTING ROD HD260
|
Side Play |
Bearing Journal Size |
Bearing Clearance |
Desired Clearance |
|
| Possible | Desired | |||
| .0016 | .008 | 2.500 | .0025 | .0015 |
| .010 | - | - | .0005 | - |
CRANKSHAFT HD260
|
Thrust On Front Main Bearing |
End Thrust |
Bearing Journal Size |
Bearing Clearance |
Desired Clearance |
Flywheel RunOut |
| .008 | 2.874 | .0027 | .0015 | .008 | |
| .005 | 2.873 | .0005 | - | - |
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