A Studebaker Reference Guide

1931

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Starting Serial Number: Six (Model 54)... 5096001 - 5120000
  Dictator Eight (Model 61)... 9000001 - 9015000
  Commander Eight (Model 70)... 8025001 - 8036000
  President Eight (Model 80)... 7031001 - up
  President Eight (Model 90)... 6022001 - 6025000

Location: On frame under left front fender.

Jump to:
General Specs | General Engine Specs | Engine Tune Up Specs | Engine Clearances | Lube Chart

General Specifications:
Model Wheelbase (In.) Shipping Weight (lb.) Tire Size (In.)
54 114 2900 5.25-19
61 114 3095 5.25-19
70 124 3525 6.00-19
80 130 4250 6.50-19
90 136 4275 6.50-19
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General Engine Specifications:
Model # of Cyl - Bore & Stroke Displacement Compression Max Brake H.P. H.P. per Cubic In. # of Main Bearings
54 6 - 3 1/4 x 4 1/8 205.3 5.20 70@3200 .338 4
61 8 - 3 1/16 x 3 3/4 221.0 5.00 81@3200 .367 9
70 8 - 3 1/16 x 4 1/4 250.4 5.20 101@3200 .403 9
80 6 - 3 1/2 x 4 3/8 337.0 5.10 122@3200 .362 9
90 6 - 3 1/2 x 4 3/8 337.0 5.10 122@3200 .362 9
Firing Order: 6-cyl models: 142635; 8-cyl models: 16258374
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Engine Tune-Up Specifications:
Model Plug Type Plug Gap Point Gap Dwell Ign. Timing Ign. Timing Mark Compression Inlet Tappet Exhaust Tappet
54 Champ - C4 .025 .018-.024 36 M-15
A-28
Note1 104@1200 .004C .007C
61, 70 Champ - 2 .025 .018-.024 34 M-25
A-20
Note2 104@1200 .004C .007C
80, 90 Champ - 2 .025 .018-.024 49 M-25
A-17
Note2 104@1200 .004C .007C
M=Manual, A=Automatic

Note1: With spark control button pushed in for full advance, breaker points open when the punch mark 1/2" ahead of the DC1-6 (or UDC1-6) mark aligns with the peep hole pointer.

Note2: With spark control fully advanced, stationary breaker points open when the punch mark 1" ahead of the 1-8TDC mark on the flywheel aligns with the peep hole pointer.

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Engine Clearances:
Model Piston Top Piston Bottom Ring Gap Oil Ring Gap Comp. Wristpin Rod Clearance Rod Endplay Thrust on # Main Endplay Main Clearance
54 .012 .003 .013 .013 .0002 .0008 .004 3 .003 .001
61, 70 .020 .0015 .013 .013 .0002 .0008 .003 1 .003 .001
80, 90 .028 .0015 .013 .013 .0001 .0008 .0015 1 .003 .001
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Lubrication Chart:
Engine Transmission Rear Axle
Model Temp SAE # Temp SAE # Temp SAE # Rear Wheel Bearings Front Wheel Bearings Steering Gear Clutch Release Bearing Water Pump & Fan
54 Above 90 40 Summer 160 Summer 160 Pack w/Cup Grease Pack w/Cup Grease Chassis Lube 160 Oil Fan: 30 Oil
45 - 90 30 Winter 90 Winter 90
10 - 45 20
Below 10 10
61 Above 90 40 Summer 160 Summer 160 Pack w/Cup Grease Pack w/Cup Grease Chassis Lube Cup Grease Fan: 30 Oil
45 - 90 30 Winter 90 Winter 90
10 - 45 20
Below 10 10
70 Above 90 40 Summer 160 Summer 160 Pack w/Cup Grease Pack w/Cup Grease Chassis Lube 160 Oil Fan: 30 Oil
45 - 90 30 Winter 90 Winter 90
10 - 45 20
Below 10 10
61 Above 90 40 Summer 160 Summer 160 Pack w/Cup Grease Pack w/Cup Grease Chassis Lube 160 Oil Fan: 30 Oil
45 - 90 30 Winter 90 Winter 90
10 - 45 20
Below 10 10
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Table of Contents | Chapter 4 - Studebaker Cars - Prewar