Technical information

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Workshop Manual_3 - 4 LD_cod. ED0053025560_4° ed_ rev. 03

Disassembly / Reassembly

Side distributor port

It can be found in engines equipped with industrial type drive

shaft.

The gaskets 3 and 5, thanks to their thickness, assure the oil

seal and affect the camshaft axial clearance, as well.

For the check, see information hereunder.

Components

For 3LD 450, 3LD 510 picture 40

1 Port 2 Bush 3 Gasket

Fix the door at its base at 25 Nm.

For 4LD 640, 4LD 705, 4LD 820 picture 41

4 Port 5 Gasket 6 Ball bearing

Fix the port at its base at 40 Nm.

Camshaft axial clearance

Carry out this check before assembling the head. Fix the side

distributor port or bell 1 at 25 Nm. Remove the intake and

exhaust tappets and with an implement operate on the camshaft

forward and backward in an axial direction.

The axial clearance A shall be:

A = 0.20 ÷ 0.60 mm 3LD 450, 3LD 450/S, 3LD 510, 3LD 510/S.

A = 0.15 ÷ 0.65 mm for 4LD 640, 4LD 705, 4LD 820.

Adjust the clearance by changing the gasket thickness between

the distributor port (if it is assembled) or bell 1 and the base; it is

forbidden to assemble more than one gasket.