C4.4 Engines for Caterpillar Built Machines Caterpillar

Engines with Balancer Group

Type ... Gear-driven differential rotor

Number of lobes

Inner rotor ... 6

Outer rotor ... 7

Illustration 1	g00989248
The oil pump for the balancer

(1) Clearance of the outer rotor to the body ... 0.130 to 0.24 mm (0.0050 to 0.0094 inch)

Illustration 2	g00989236
Inner rotor

(2) Clearance of inner rotor to outer rotor ... 0.050 to 0.200 mm (0.0020 to 0.0079 inch)

Illustration 3	g00989217
The end play for the rotor

(3) End play of rotor assembly

Inner rotor ... 0.04 to 0.11 mm (0.0016 to 0.0043 inch)

Outer rotor ... 0.04 to 0.00 mm (0.0016 to 0.0043 inch)

Illustration 4	g01455406
The end cover

(4) Torque for cover bolts for oil pump ... 26 N·m (19 lb ft)

Illustration 5	g01335780
Idler gear and pump gear

Note: Replace the idler gear bolt (5) and the nut for the oil pump gear (6).

(5) Tighten the idler gear bolt to the following torque. ... 26 N·m (19 lb ft)

Note: Set the engine to the TC position. Refer to Systems Operation, Testing and Adjusting Manual, "Finding Top Center Position for No. 1 Piston". Install the balancer. Refer to Disassembly and Assembly, "Balancer - Install". Install the gear for the oil pump and tighten the nut (6).

(6) Tighten the nut to the following torque. ... 95 N·m (70 lb ft)

Tighten the bolts that hold the balancer to the cylinder block to the following torque. ... 54 N·m (40 lb ft)

Engines without Balancer Group

Type ... Gear-driven differential rotor

Number of lobes

Inner rotor ... 5

Outer rotor ... 6

Illustration 6	g00938064
The oil pump

(1) Clearance of the outer rotor to the body ... 0.205 to 0.315 mm (0.00807 to 0.01240 inch)

Illustration 7	g00938061
Checking the clearance

(2) Clearance of inner rotor to outer rotor ... 0.040 to 0.127 mm (0.0015 to 0.0050 inch)

Illustration 8	g00938799
Checking the end play

(3) End play of rotor assembly

Inner rotor ... 0.038 to 0.089 mm (0.0014 to 0.0035 inch)

Outer rotor ... 0.04 to 0.09 mm (0.00157 to 0.00354 inch)

Tighten the bolts that hold the front cover of the oil pump assembly to the following torque. ... 26 N·m (19 lb ft)