3126B and 3126E Truck Engines Caterpillar

One-Piece Body

Illustration 1	g01156510

Two-Piece Body

Illustration 2	g01156511

(1) The bypass valve spring is located in the filter bypass valve:

Outside diameter ... 11.0 mm (0.43 inch)

Free length ... 58.50 ± 0.50 mm (2.303 ± 0.020 inch)

Assembled length ... 43.18 mm (1.70 inch)

Load at assembled length ... 43.7 N (9.82 lb)

(2) The oil filter bypass valves must open at the following pressure. ... 125 ± 30 kPa (18.1 ± 4.4 psi)

(3) Prior to installing the stud into the engine oil filter base, apply 9S-3263 Thread Lock Compound to the base end of the stud. Length ... 7.5 ± 1.5 mm (0.30 ± 0.06 inch)

Tighten the stud to the following torque. ... 68 ± 7 N·m (50 ± 5 lb ft)

(4) Use clean engine oil to lubricate the oil filter's seal. Tighten the filter until the seal contacts the base. Hand tighten the filter for an additional 3/4 turn (270 degrees).