MODEL IDENTIFICATION
SERIAL NUMBER: First No. 73-101 (1937),
83-101
(1938). Stamped on plate on right front door hinge pillar post.
Number prefix (73-, 83-) indicates model.
ENGINE NUMBER: First No. 73-101(1937), 83-101
(1938). Stamped on left side of cylinder block opposite #6 cylinder
(1937), top of block between #1 and #2 exhaust flanges (1938).
Number prefix (73-, 83-) indicates model.
TUNE-UP
COMPRESSION: Compression Pressure
6.25-1 std. CI. head 103 lbs. @ 170 R.P.M.
7.0-1 Optl. Al. head 119 lbs. @ 170 R.P.M.
NOTE-7.0-1 aluminium head - Super Power Dome.
VACUUM READING: - Gauge should show steady reading of
18-21", with engine idling at 350 R.P.M.
FIRING ORDER: 1-5-3-6-2-4.
SPARK PLUGS: Champion Type J-8A (Std. 6.25-1 Eng.), Type H-10
(Optl. 7.0-1 Eng.). 14 mm. Metric.
Gaps - . 032"
IGNITION: See Coil, Condenser, and Distributor.
Breaker Gap - .020". Cam Angle 35º (closed).
Automatic Advance - 14º max. at 1580 RPM
(distributor).
IGNITION TIMING:
Std. Setting - At TDC. Flywheel mark "UDC.1-6/" at
indicator in left front face of housing.
CARBURETION:
Idle Setting -Both idle screws ¼-¾ turn open. Idle
speed 7 MPH.
Accelerating Pump - Inner hole Warm Temperatures,
Outer hole - Cold Temperatures.
Float Level - 15/64" from gasket seat on cover to top of float
(not soldered seam). Invert to check.
Fuel Pump Pressure: 4½ lbs. maximum.
MANIFOLD HEAT CONTROL: - Thermostatic coil
type. Located within manifold housing behind carburettor. No
adjustment required,
VALVES:
Tappet Clearance - .006" Int., .008", Exh. Hot.
STARTING: See Battery, Starter, Generator, Regulator.
IGNITION
IGNITION SWITCH: Mitchellock Model 24-B, Type
7063 (1937), 7642 (1938). Connected to coil by armoured cable.
Ignition Lock - Briggs & Stratton, Mitchell No. 6095.
B&S No. 50184. Key Series - H601-H1100.
COIL: Auto-Lite Model IG-4644 (1937), IG-4650
(1938). Service Coil (less Switch & Cable) IG-3224JS. |
Ignition Current - 2.5 amperes idling,
4.5 stopped.
CONDENSER: Auto-Lite Part No. IGB-1025 (1937), IGB-1025J
(1938). Capacity-.20-.25 microfarad.
DISTRIBUTOR:
Auto-Lite Model IGW-4013-A (1937), IGW-4103-A (1938). Single
breaker, 6 lobe cam, full automatic advance type.
Breaker Gap - Set at .020".
Cam Angle or Dwell - 35º (closed), 25º (open).
Breaker Arm Spring Tension-16-20 ounces.
Rotation - Clockwise viewed from the top.
Automatic Advance
Distributor |
Engine |
Degrees |
R.P.M. |
Degrees |
R.P.M. |
Start |
300 |
0 |
600 |
3 |
400 |
6 |
800 |
4 |
500 |
8 |
1000 |
9 |
1040 |
18 |
2080 |
14 |
1580 |
28 |
3160 |
Fuel Compensator - provides manual adjustment at distributor for
octane rating of fuel used. See Fuel Compensator Setting
(following).
Distributor Removal: - Mounted on right side of crankcase. To
remove, take out hold-down screw in advance arm.
IGNITION TIMING: - Initial Setting as shown. See
Fuel Compensator Setting following.
Flywheel Degrees Piston Position
All engines 0º TDC .000" TDC.
NOTE - High octane fuel must be used in engines
with 7.0-1 Super Power Dome head.
To Set Timing - With #1 piston on compression, turn engine
over until flywheel mark 'UDC.1-6/', lines up with pointer in left
front face of flywheel housing. Loosen hold-down screw In advance
arm, rotate distributor clockwise to limit of slot, then slowly
rotate distributor counter-clockwise until contacts begin to open,
tighten hold-down screw.
To Set Timing (Using Synchroscope) - Hudson recommends
this method. Clip lead to #6 spark plug fill, in timing mark with
white chalk and direct light on flywheel through hole in housing.
Fuel Compensator Setting - Road test car and note performance
when accelerating from 10-15 M.P.H. with wide open throttle on level
road (engine must be warm). Slight spark knock should be evident.
Adjust by loosening hold-down screw and rotating distributor one
graduation on scale counter-clockwise (if no knock), clockwise (if
knock too severe). Repeat test. Final setting must not be advanced
beyond ¾" before'UDC.1-6/' mark on flywheel. |