Bosch 5302 Technical Information download pdf (Page 20)

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

Disassembly / Reassembly

Valves guides and housings

1 Exhaust valve guide

2 Intake valve guide

Dimensions (mm):

3LD 450, 3LD 451/S, 3LD 510, 3LD 510/S

A = 43.80 ÷ 44.20 B = 55.80 ÷ 56.20

C = 11.00 ÷ 11.018 D = 11.05 ÷ 11.06

4LD 640, 4LD 705, 4LD 820

A = 47.80 ÷ 48.20 B = 65.80 ÷ 66.20

C = 12.000 ÷ 12.018 D = 12.05 ÷ 12.06

Note: Valve guides with an external dia. increased of 0.5 mm

can be used as spare parts; in this case it is necessary to

increase the housing C of 0.5 mm for the assembly.

Valve guides insertion

Heat the head at 160° ÷ 180°. Force the guides according to A

and B distance with respect to the head surface.

3LD 450, 3LD 451/S, 3LD 510, 3LD 510/S

A = 30.80 ÷ 31.2 B = 18.8 ÷ 19.2

4LD 640, 4LD 705, 4LD 820

A = 35.8 ÷ 36.2 B = 17.8 ÷ 18.2

Note: if the guides are supplied with the housing for the lock

ring C, insert the ring, then drive the guides without

worrying about A and B.

Valve guide dimensions and clearances

3LD 450, 3LD 451/s, 3LD 510, 3LD 510/S (mm):

D = 7.030 ÷ 7.050 E = 6.985 ÷ 7.000

(D-E) = 0.030 ÷ 0.065 (D-E) limit= 0.13

4LD640, 4LD 705, 4LD 820

D = 8.030 ÷ 8.050 E = 7.985 ÷ 8.000

(D-E) = 0.030 ÷ 0.065 (D-E) limit =0.13

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Bosch 5302 Technical Information Page 20