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 TM 10-3930-623-12
Stem to Guide Clearance .....................0.0017/0.0037
Additional Wear (All) .......................................0.0015
Additional Wear ................................................0.002
Length ............................................................ 2-5/16
Valve Seat Angle ............................................45 deg
Outside Dia .........................................0.6565/0.6575
Valve Seat Width Desired ..................................0.066
Valve Timing
Valve Spring Free Length ................................. 2-1/16
Intake Valves Open Before
Top Dead Center ........................................ 4-1/2 deg
Valve Spring Outside Dia ...................................31/32
Crankshaft Rotation Piston Travel,
Valve Spring Wire Size ......................................0.142
Top of Block to Top of Piston at 4-1/2
Deg Before fop Dead Center ............................0.0134
Spring Length (Valve Closed) .........................1-45/64
Timing Gears
Valve Spring Load at Closed Length ............... 47/53 lb
Valves and Springs (Exhaust)
Backlash ................................................. 0.001/0.003
Cylinder Head
Stem Dia .............................................0.3405/0.3415
Max. Warpage Crosswise..................................0.003
Additional Wear ................................................0.002
Head Dia ................................................ 1.307/1.317
Max. Warpage Lengthwise ................................0.004
Oil Pump
Overall Length .....................................5.1745/5.2895
Clearance Between End of Gear
Valve Face .......................................................0.124
Teeth and Body ...................................... 0.002/0.004
Tappet Clearance (Hot) .....................................0.014
Backlash to Camshaft Gear ...............................0.003
Stem in Guide Clearance ......................0.0037/0.0057
Lash Between Gears ............................... 0.001/0.003
Valve Seat Angle ............................................45 deg
4.
FUEL SYSTEM
Valve Seat Width ..............................................0.085
Carburetor
Valve Spring Free Length ................................. 2-1/16
Make ...............................................................Zenith
Valve Spring Outside Dia ...................................31/32
Type ........................................... updraft, single bore
Valve Spring Wire Size ......................................0.142
Adjustments
Spring Length (Valve Closed) ..........................145/64
Idle Mixture Screw ......................... 1 to 1.5 turns open
Valve Spring Load at Closed Length ............... 50/53 lb
Idle Speed Screw......................450 to 500 engine rpm
Valve Tappets
Fuel Pump
Tappet Dia ............................................ 0.999/0.9995
Pressure (Static) .................................. 1.5 to 2.25 psi
Tappet Clearance in Guide .................... 0.0015/0.005
Capacity (Minimum) ............................... 1 pt per min.
Valve Guides
Fuel Tank Capacity ......................................... 12.7 gal.
Distance From Top of Block to
Governor Setting ................................. 2500 engine rpm
Top of Guide ..................................................1-15/32
5.
TRANSMISSION
Stem Hole Dia (Intake) .........................0.3432/0.3442
Make .................................................................. Baker
Stem Hole Dia (Exhaust) ......................0.3452/0.3462
2-5
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