3408 & 3408B DIESEL TRUCK ENGINE Caterpillar

(1) Torque for the center studs under the filter base (put 9S3263 Thread Lock on last 10 mm (.40 in.) of thread at base end of studs) ... 80 ± 14 N·m (60 ± 10 lb.ft.)

(2) 4N8150 Spring for the filter bypass valve:

Length under test force ... 55.25 mm (2.175 in.)

Test force ... 75.6 ± 5.8 N (17.0 ± 1.3 lb.)

Free length after test ... 93.7 mm (3.69 in.)

Outside diameter ... 20.6 mm (.81 in.)

Pressure difference to open the filter bypass valve ... 255 ± 20 kPa (37 ± 3 psi)