3145, 3150 & 3160 INDUSTRIAL ENGINES Caterpillar

Pressure of oil when measured at oil filter base (warm oil):

High idle rpm ... 50 to 85 psi(3.5 to 6.0 kg/cm²)

Low idle rpm ... minimum oil pressure of 15 psi(1.1 kg/cm²)

Maximum permissible end clearance of oil pump gears when measured with oil pump installed to front cover ... .006 in.(0.15 mm)

(1) Clearance of oil pump gear rotor tip ... .002 to .006 in.(0.05 to 0.15 mm)

Maximum permissible clearance of oil pump gear rotor tip ... .009 in.(0.23 mm)

(2) 9L9243 Spring (pump pressure relief valve):

Length under test force ... 2.66 in.(67.6 mm)

Test force ... 34 ± 2 lbs.(15.4 ± 0.9 kg)

Free length after test ... 3.50 in.(88.9 mm)

Outside diameter ... .875 in.(22.23 mm)