Operation Manual

Table Of Contents

Job Card No.:

Engine:

Filing No.:

Lower Valve Drive

0178-11-10 1992

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.

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 01.09.01). Set valve clearance (job 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. Proceed by slightly

bending the welding wires at the lower end.

Then push the wires into the oil return bores of the tappets, raise the tappets, and suspend them at the upper

edge of the cylinder heads by bending the wires accordingly.

Fig. 3