Valves and Springs (Exhaust)

TM 10-3930-623-34

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

Valve Seat Width Desired ...............................0.066

Outside Dia ......................................0.6565/0.6575

Valve Spring Free Length ............................. 2-1/16

Valve Timing

Valve Spring Outside Dia ................................31/32

Intake Valves Open Before

Valve Spring Wire Size ...................................0.142

Top Dead Center ...................................... 4-1/2 deg

Spring Length (Valve Closed) .......................145/64

Crankshaft Rotation Piston Travel,

Valve Spring Load at Closed Length ........... 47/53 lb

Top of Block to Top of Piston at

4-1/2 Deg Before Top Dead Center ...............0.0134

Valves and Springs (Exhaust)

Timing Gears

Stem Dia .......................................... 0.3405/03415

Backlash .............................................. 0.001/0. 003

Additional Wear .............................................0.002

Cylinder Head

Head Dia ............................................. 1.307/1.317

Max. Warpage Crosswise...............................0.003

Overall Length ..................................5.1745/5.2895

Max. Warpage Lengthwise ............................0.004

Valve Face ....................................................0.124

Oil Pump

Tappet Clearance (Hot) ..................................0.014

Clearance Between End of Gear

Stem in Guide Clearance ...................0.0037/0.0057

Teeth and Body ................................... 0.002/0.004

Valve Seat Angle .........................................45 deg

Backlash to Camshaft Gear ............................0.003

Valve Seat Width ...........................................0.085

Lash Between Gears ............................ 0.001/0.003

Valve Spring Free Length ............................. 2-1/16

Valve Spring Outside Dia ................................31/32

2-4. FUEL SYSTEM

Valve Spring Wire Size ...................................0.142

Carburetor

Spring Length (Valve Closed) ......................1-45/64

Make ............................................................Zenith

Valve Spring Load at Closed Length ........... 50/53 lb

Type ........................................ updraft, single bore

Valve Tappets

Adjustments

Tappet Dia ......................................... 0.999/0.9995

Idle Mixture Screw ...................... 1 to 1.5 turns open

Tappet Clearance in Guide ................. 0.0015/0.005

Idle Speed Screw ..................450 to 500 engine rpm

Valve Guides

Fuel Pump

Distance From Top of Block to

Pressure (Static) ............................... 1.5 to 2.25 psi

Top of Guide ...............................................1-15/32

Capacity (Minimum) ............................ 1 pt per min.

Stem Hole Dia (Intake) ....................... 03432/03442

Fuel Tank Capacity ......................................... 12.7 gal.

Stem Hole Dia (Exhaust) ................... 03452/0.3462

Governor Setting ........................... 2500 engine rpm

2-5. TRANSMISSION

Make ..............................................................Baker

2-5