Con-rod with Piston, Replace
 Important! If one part of a piston with pressed in con-rod must be replaced, all components of this assembly (piston, piston rings, piston pins and con-rod) must be replaced by new parts.
 Assemble Assemble guide bolt from KM-634-6, KM-634-7, and KM-634-5. Insert piston into key groove of KM-634-1 (1). Piston pin bore must be in horizontal position. Notice: For pistons of 12 NZ, C 12 NZ, and X 12 SZ, put Spacer Plate KM-634-3 onto right slanted side of KM-634-1. Install Fixing Angle KM-634-4 (3) to KM-634-1. Tighten fastening bolts only fingertight. Clamp piston with Stop Plate KM-634-2 (2) to secure against turning. | 
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 Adjust Determine press-fit depth of piston pin. Push assembly (1,2,3) of KM-634-6, KM-634-7 (corresponds to length of piston pin) and KM-634-5 through piston pin bore and con-rod until KM-634-7 is centrally seated in the piston. In this position, Fixing Angle KM-634-4 (5) must touch the assembly tip (4) without gap (arrows). Tighten fastening bolts of fixing angle.
 Install, Connect Remove Centre Piece KM-634-7 (2) from guide bolt and replace with new piston pin (oiled).
Assemble Warm new con-rod at upper con-rod eye using heating plate. Installation temperature - 280 ° C to max. 320 ° C/536 ° F to 608 ° F. Lay eye surface flat on heating plate and reduce heat dissipation with fireproof chamotte brick (see illus. III). | 
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Important! As con-rods have no weight balancing studs, they cannot be reworked. Installation position: Bead on con-rod (2) is on same side as arrow (1) on piston head (see illus.). Tight piston pin cannot be pushed further. Install quickly. | 
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Assemble Assembly from KM-634-6, push piston pin and KM-634-5 evenly and without delay through piston pin bore and con-rod until it touches Fixing Angle KM-634-4 without gap.
Install, Connect Remove KM-634-5 and KM-634-6 from right and left side of piston pin and install piston with con-rod - see operation "Piston with Con-rod, Remove and Install". | 
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