Technical data

(9) The piston and the connecting rod should be
assembled as described below using Piston Pin
Setting Tool (Special Tool), except the W33. (See
below.)
Insert the piston pin into the push rod of the tool, then screw the guide fully into the push rod.
Insert the assembled push rod, piston pin and guide into the piston pin hole from the guide side,
and into the small end of the connecting rod. In this case, make certain the front
mark(arrow) on the piston head and the identification mark on the connecting rod are on
the same side, or face up. Before insertion, apply engine oil sufficiently to the piston pin
O.D. and the connecting rod small end I.D.
Set the piston, connecting rod and tool on the tool body. To set, insert the pin and connecting rod
assembly and the tool into the tool body with the cut of the guide properly aligned with
that of the tool body, and them turn the guide a 90 degree turn. After setting, make
certain the small end of the connecting rod rests properly on the tool body. Also check to
see if the front mark on the piston head and the connecting rod identification mark face
up.
Press in the piston pin with 500 to 1,500 kg pressure. If the piston pin is easily pressed in with a
less pressure than the above, or if the pin needs a greater pressure, replace the connecting
rod or the piston and piston pin assembly. The piston pin is pressed into the specified
position by the guide. After installation, turn the push rod 90 degrees until the guide and.
tool body cuts match up, and then detach the piston and connecting rod assembly from
the tool body.
CAUTION:
AFTER ASSEMBLING THE PISTON AND CONNECTING ROD, MAKE CERTAIN THE
CONNECTING ROD SMALL END IS PROPERLY POSITIONED IN THE CENTER OF THE
PISTON PIN. IN THE EVENT OF EXCESSIVE SHIFT OF THE PISTON PIN FROM ITS
PROPER POSITION, CORRECT IT. IN THIS CASE, CHECK THE SPECIAL TOOL ALSO.
THE PISTON AND PISTON PIN ARE MATCHED PARTS AND THEREFORE MUST NOT
BE MIXED WITH OTHER PARTS. PISTONS AND PISTON PINS TO BE USED IN ONE
ENGINE MUST BE OF THE SAME SIZE (SAME MARK).
When assembling the piston and connecting rod for the W33 engine, heat the piston at 80
degrees C for about 5 minutes in oil using a piston heater. After installing the piston pin, lock
with a snap ring at each end of the pin to prevent it from loosening.