A Studebaker Reference Guide

1954 Truck
3R Series

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Truck Model Engine Used Engine Model Crankcase Cap. Qts. Cooling Cap. Qts.
3R5 own 1R 5 10
3R6 own 6R 6 15
3R10 own 1R 5 10
3R11 own 6R 6 15
3R14 own 6R 6 15
3R15 own 2R 5 10
3R16 own 4R 6 15
3R17 own 4R 6 15
3R28 own VT 6 18
3R38 own VT 6 18

Serial Number Plate Location: On seat riser, left side

Engine Number Location: 6 cyl - At the top left side front corner of the cylinder block. 8 cyl - On top, front end of cylinder block next to oil filler tube.

Production Information: n/a

General Engine Specifications:
Engine Model # of Cyl - Bore & Stroke Displacement Compression Max Brake H.P. Max Torque H.P. Oil Pressure Lbs.
1R, 2R 6 - 3 x 4 170 7.00 75@3600 133@1600 40
4R, 6R 6 - 3.3125 x 4.750 246 7.00 102@3200 205@1200 40
VT 8 - 3.3750 x 3.250 233 7.50 125@4000 202@2000 40

Engine Tune-Up Specifications:
Model Firing Order Spark Plug Type Spark Plug Gap Valve Seat Angle Intake Tappet Exhaust Tappet Valve Spring Pressure lb @ inch
1R, 2R 153624 Champ. J7 .030 45 .016C .016C 98 @ 1 5/16
4R, 6R 153624 Champ. J7 .030 45 .016C .016C Note#1
VT 18436572 Note#2 Champ. H10 .035 45 .022H .024H Note#3
Note#1: Intake valves 130 @ 1 3/4", exhaust valves w/roto cap 125 @ 1 1/2".
Note#2: Cyl numbering: Left bank: 1-3-5-7, right bank: 2-4-6-8.
Note#3: Intake valves 110 @ 1 11/16", exhaust valves 110 @ 1 11/32".

Piston, Rings & Bearings:
Model Wristpin Dia. Piston Clearance Comp. Ring Gap Oil Ring Gap Crankpin Dia. Rod Bearing Clearance Main Journal Dia. Main Bearing Clearance Crank Endplay
1R, 2R .750 .002 Note#4 .007 .007 1.81175 - 1.81275 .0005 - .002 2.437 - 2.4375 .0005 - .0025 .003 - .006
4R, 6R .875 .002 Note#5 .008 .008 2.18675 - 2.78775 .0005 - .002 2.8745 - 2.8750 .0005 - .0025 .003 - .006
VT .875 .002 Note#4 .008 .008 1.99925 - 2.00025 .0005 - .002 2.4995 - 2.5000 .0005 - .0025 .003 - .006
Note#4: Using a 1" feeler a pull of 11 to 16 lbs on a spring scale should be necessary to withdraw the feeler past the piston.
Note#5: Using a 1" feeler a pull of 14 to 19 lbs on a spring scale should be necessary to withdraw the feeler past the piston.

Engine Tightening Specifications:
Torque specifications are for clean and lightly lubricated threads only. Dry or dirty threads produce increased friction which prevents accurate measurement of tightness.
Model Spark Plug Cyl Head Bolts Intake Manifold Exhaust Manifold Rocker Arm Shaft Rocker Arm Cover Connecting Rod Cap Main Bearing Cap Flywheel to Crankshaft Vibration Damper or Pulley
1R, 2R 25-30 46-50 18-22 18-22 None None 28-32 88-93 33-35 130-140
4R, 6R 25-30 80-85 25-30 25-30 None None 52-54 88-93 33-35 160-170
VT 25-30 46-50 25-30 25-30 46-50 8-10 in. lbs. 52-54 88-93 33-35 130-140
All measurements are in ft. lbs. unless otherwise listed.

Table of Contents | Chapter 6 - Studebaker Trucks