PISTONS AND CONNECTING RODS-F.4 expanding tool of the type shown in Fig. F.3. These rings, being made of cast iron are therefore com- paratively brittle, so when fitting care should be taken not to expand any ring more than is necessary to just clear the piston. PISTON CROWN SECOND AND FOURTH SEGMENTS FIRST AND THIRD SE.GMENTS F9 laminated Segment Rings The procedure for fitting the laminated type is different, in as much as the ring comprises four separate seg- ments, these may be fitted by hand in the following sequence with the piston crown uppermost:- 1.
Fit the first segment to the piston so that when held horizontally between the thumb and fingers and radially compressed the ring ends point downwards (see Fig. F.9). 2. Fit the second segment on top of the first, so that when compressed as described above the ends point upwards. Position the gap at 180 0 to that of the first segment. 3. Fit the third segment as in (1) above with the gap immediately above the gap of the first segment. 4. Fit the fourth segment as in (2) above with the gap immediately above the gap of the second seg- ment. If all the segments have been fitted correctly then they will be positioned as shown above.
Place this ring on the bottom face of the fourth ring groove with the gap over the gudgeon pin bore. F10