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We will try to make available some very helpful tips and information for those members considering doing their own repair or restoration work. If you have some helpful information, tips and pictures you would like to share, be sure to send them to us. |
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The
24hp Engine
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| CRANKSHAFT | CYLINDER BLOCK | |||||
|
Weight
|
28 lbs |
Cylinder
Bore
|
3.875" to 3.876" | |||
|
Main
Bearings
|
1.624" Dia |
Valve
Guide Bore
|
.594" to .595" | |||
|
Crank
Pins
|
1.499" Dia |
Flatness
On Top block
|
.003" | |||
|
Crank
Pin Taper & Roundness
|
.0005" to .001" |
Cylinder
Bore Perpendicular to Top
|
.001" to .002" | |||
|
Rear
Flange Thickness
|
3/8" | |||||
|
End
Clearance
|
.004" to 007" | |||||
|
Main
Bearing Clearance
|
001" | |||||
|
Crankshaft
Straightness
|
.0005" | |||||
|
Main
Bearing Car Torque
|
80-100lbs | |||||
| CONNECTING RODS | FLYWHEEL | |||||
|
Weight
|
1lb 6oz |
Weight
Balance Within |
63lbs
4oz. .15 In/oz |
|||
|
Balance
Weight
|
552
gms +/-1 gm crank end 198 gms +/- 1 gm pin end |
Flywheel
Bolt Torque
|
65 Ft/lbs | |||
|
Crankshaft
Bearing
|
1-1/2" Dia. |
Clutch
Mounting surface
& disc surface must run true to crankshaft |
within .005" TIR | |||
|
Piston
Pin Bearing
|
1" Dia. |
Clutch
mounting shoulder diameter
must be concentric with crankshaft flange diameter |
within .005" TIR | |||
|
Bearing
Side Clearance
|
.008" to .012" |
Pilot
bearing
|
GMN6203DV | |||
|
Piston
Pin Clearance
|
.005" | |||||
|
Crankshaft
Clearance
|
.001" | |||||
|
Bearing
Cap Bolt torque
Assembled with Oil Dippers Facing Camshaft |
40 - 50 lbs | |||||
| IGNITION | COOLING SYSTEM | |||||
|
Rotor
Rotation
|
counter
clockwise |
Water
Pump Shaft
|
5/8" Dia | |||
|
Point
Gap
|
.016" to .020" |
Water
Pump Shaft end Play
|
.006 to .010" | |||
|
Condenser
Capacity
|
.20 to .25 MFD |
Radiator
Hoses
|
1928/29 upper 2" Dia., 6-1/4" Long 1930-31 upper 2" Dia., 8" Long Lower ( 2 pieces ) 1-3/4" Dia, 2-3/4" Long |
|||
|
Spark
Plug
|
Champion
3X |
System
Capacity
|
3 Gals | |||
|
Spark
Plug Gap
|
.035" |
Radiator
Capacity
|
1-1/2 Gals | |||
|
Spark
Manual Advance
|
.20 Deg |
Radiator
Flow
|
38 GPM | |||
|
Rotor
Air Gap
|
.025" | |||||
|
Bearing
Cap Bolt torque
Assembled with Oil Dippers Facing Camshaft |
40 - 50 lbs | |||||
|
VALVES
|
CAMSHAFT
|
|||||
|
Lift
|
.287"
w/
.015" Clearance |
Shaft
Dia
|
7/8"
|
|||
|
Seat
Angle
|
45
Deg
|
Bearing
Dia
|
1.560"
|
|||
|
Seat
Width
|
3/32"
|
Block
Bore Dia
|
1.561"
|
|||
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Stem
Dia
|
.311"
|
Bearing
Clearance (max)
|
.003"
|
|||
|
Valve
Length
|
5.677"
|
Cam
Lift
|
.303"
|
|||
|
Head
Diameter
|
1.537"
|
Duration
|
236
Deg
|
|||
|
Valve
Opening Dia.
|
1-3/8"
|
Timing
Gear Cover Spring
|
Tension
35 lbs
|
|||
|
Port
Dia
|
1-3/8"
|
Timing
Gear Backlash
|
.003
to .005"
(max .009) |
|||
|
Valve
Clearance
|
Exhaust
.002"
Intake .001" to .0015" |
Camshaft
Straightness
|
.0005"
to .001"
|
|||
|
Lifter
Clearance
|
Exhaust
.015"
Intake .013" |
|||||
|
Valve
Guides
|
ID
.3135"
OD .5938" |
|||||
|
Valve
Spring
|
OD
1.022"
|
|||||
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Valve
Timing Intake
|
opens
7-1/2 deg BTDC
|
|||||
|
Intake
Closes
|
48-1/2
deg
After BDC |
|||||
|
Exhaust
Opens
|
51-1/2
deg
Before BDC |
|||||
|
Exhaust
Closes
|
40-1/2
ATDC
|
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Gene Laks & Bruce Marshall. All rights reserved.
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