A Studebaker Reference Guide

1941-48 Truck
M Series

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Truck Model Year Engine Used Engine Model Cooling Cap. Qts.
M5 1941 - 48 own 1M 10
M15 1941 - 42 own 2M 10
M15A 1946 - 48 own 2M 10
M15T 1941 - 42 own 2M 10
M15 - 20 1945 own 2M 10
M15 - 28 1945 own 2M 10
M16 1941 - 48 own 3M 13

Serial Number plate Location: n/a.

Production Information: n/a

General Engine Specifications:
Engine Model # of Cyl - Bore & Stroke Displacement Compression Max Torque H.P. Max Brake H.P. Oil Capacity Qts.
1M 6 - 3 x 4 170 6.50 134@2000 80@4000 5
2M 6 - 3 x 4 170 6.50 134@2000 80@4000 5
3M 6 - 3 5/16 x 4 3/8 226 6.50 176@1600 94@3600 6

Engine Tune-Up Specifications:
Model Firing Order Spark Plug Gap Point Gap Valve Seat Angle Intake Tappet Exhaust Tappet Intake Stem Clearance Exhaust Stem Clearance Valve Spring Pressure lb @ inch
1M 153624 .025 .020 45 .016C .016C .002-.0035 .0025-.0035 79 @ 1 7/16
2M 153624 .025 .020 45 .016C .016C .002-.0035 .0025-.0035 79 @ 1 7/16
3M 153624 .025 .020 45 .016C .016C .002-.0035 .0025-.0035 130 @ 1 3/4

Piston, Rings & Bearings:
Model Piston Clearance Comp. Ring Gap Oil Ring Gap Crankpin Dia. Rod Bearing Clearance Main Journal Dia. Main Bearing Clearance Crank Endplay
1M .002 .007 .007 1.81175 - 1.81275 .0005 - .002 2.437 - 2.4375 .0005 - .0025 .003 - .006
2M .002 .009 .009 1.81175 - 1.81275 .0005 - .002 2.437 - 2.4375 .0005 - .0025 .003 - .006
3M .002 .009 .009 2.18675 - 2.18775 .0005 - .002 2.4995 - 2.5000 .0005 - .0025 .003 - .006

Table of Contents | Chapter 6 - Studebaker Trucks