Bosch 5302 Technical Information download pdf (Page 24)

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Workshop Manual__3 - 4 LD_cod. ED0053025560_4° ed_ rev. 03

Disassembly / Reassembly

Connecting rod equipped with bearings and piston pin

For 3LD 450, 3LD 450/S, 3LD 510, 3LD 510/S

Dimensions (mm)

A = 144.05 ÷ 145.05

B = 23.02 ÷ 23.03 (with driven and machined bearing)

C = 42.028 ÷ 42.052 (with bearing tightening at 3 Nm)

D = 22.995 ÷ 23.000

For 4LD 640, 4LD 705, 4LD 820

Dimensions (mm)

A = 162.95 ÷ 163.05

B = 28.02 ÷ 28.03

C = 55.40 ÷ 55.43

D = 27.995 ÷ 28.000

The connecting rod big end bearings are supplied either at

nominal value and diminished to 0.25 and 0.50 mm.

Connecting rod, big end bearings

While reassembling, the A and B centering marks should not be

on the same side.

Tighten the screws at 30 Nm for 3LD 450, 3LD 451/S, 3LD 510,

3LD 510/S and at 45 Nm for 4LD 640, 4LD 705, 4LD 820.

Main bearing on ywheel side

Extract the bearing using three screws, as per picture 38.

While reassembling, replace gasket 1. Check that the oil seal

ring is intact. Tighten the screws at 25 Nm.

Drive shaft axial clearance

After having screwed the main bearing on the ywheel, check

drive shaft axial clearance. Its value is 0.10 ÷ 0.40 mm for 3LD

450, 3LD 450/S, 3LD 510, 3LD 510/S and 0.10 ÷ 0.30 mm for

4LD 640, 4LD 705, 4Ld 820.

The adjustment is carried out by changing the gasket 1

thickness.

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Bosch 5302 Technical Information Page 24