Hi Claude:
Department of the Army Technical Manual TM 9-8014
Department of the Air Force Technical Order TO 36A-1-401
Operation and Organizational Maintenance
1/4 Ton 4x4
Utility Truck
M38A1 and 1/4 ton
4x4
Front Line
Ambulance
M170
April 1955
Page 31 Item 35 Oil Pressure Gage
The oil pressure gage (P, Fig 11), is located in the lower right corner
of the instrument cluster, indicates engine oil pressure when engine is
running.
Note: Engine oil pressure does not indicate amount of oil in engine
crankcase.
The gage dial is marked 0 to 120 psi in graduation of 30 psi. Oil
pressure under normal operating conditions is 30 to 35 psi and
approximately 10 psi idling. Absence of oil pressure when engine is
running indicates a faulty engine lubrication system or an inoperative
gage circuit. If improper operation of lubrication system or gage
circuit is indicated, stop engine immediately and investigate cause.
(par 81i and 90d)
Note: when engine is started cold, oil pressure may indicate slightly
higher but, under normal conditions will return to normal reading (30
psi - 35 psi) after the engine has warmed up.
Oil weight 30
Hope this helps.....
Ben P. Fisher, Jr. Corona, AZ (North Charleroi, Pa Native)
52 M38A1 U.S. Army (parts vehicle)
53 M38A1 U.S. Marines (Under restoration)
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