Operation Manual

Table Of Contents

Job Card No.:

Engine:

Filing No.:

Lower Valve Drive

0178-11-10 1346

04.02.01 Page 3 of 3

S/BVM 628

Removing Tappet Roller

After removing the complete tappet (29), the roller

can be removed. The best way to do this is to use a

prism, on which the tappet is placed to press out the

roller pin (32) - Fig. 3 -. If no prism is to hand, the

tappet can be placed on a hard-wood block (33) or

on an aluminium plate provided with a suitable large

hole for free passage of the roller pin when being

pressed out.

Before pressing out the pin by means of a brass drift

and a press, place a 0,3 - 0,4 mm-thick plate (34)

between both sides of tappet (29), in order to prevent

possible deformation of the lower part of the tappet.

Refitting the Drive

Clean all drive components, apply some oil and assemble in the reverse order. Check tappet roller (31) for easy

rotation. Install tappet guide (30) provided with a new 0-seal (14) along with tappet (29) into crankcase, paying

attention to dowel sleeve (15).

Slit of dowel sleeve (15) must face longitudinal direction of engine.

Screw in bolts (16) provided with lockwashers (17) and tighten securely. Check that tappet (29) moves freely

in guide (30). Install pushrods (25) and refit cylinder head (Job Card 01.09.01). Set valve clearance (Job Card

01.01.01) .

Hint for Faciliating Removal of Camshaft

The cylinder heads can remain in situ. Only the pushrods (25) neeed be removed. By means of weld ing wires,

the tappets (29) can be raised and the camshaft removed as perJob Card 04.05.01.

At the upper edge of the tappet (29) is a bore-hole, into which a wire can be inserted. Then raise the tappet

and suspend it at the top edge of the cylinder head.

Fig. 3