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 160F

.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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