Page 71 - E BOOK ENGINE MECHANICAL M2

4. SERVICE POINTS OF 4D56 ENGINE COMPONENT

(3) Assembly of Connecting Rod and Piston
1. When replacing the piston pin, read off the cylinder
bore size mark on the cylinder block as illustrated, and
select a piston according to the following table.

Cylinder bore size Piston size mark
A A
B None
C C
The piston size mark shows on the top of the
Note
Fig. 4-29 piston.

2. Set the snap ring into one side of the piston pin hole.

3. With the front mark of the connecting rod and that of
the piston located on the same side, insert the piston
pin.

It is difficult to fit the piston pin into the piston when
they have a different temperature, Therefore, fit
Note
the piston pin into the piston when they have the
same temperature.

4. Set the snap ring into the other side of the piston pin
hole.
5. Check that the piston moves smoothly.

Fig. 4-30

(4) Connecting Rod Cap Installation

1. Verifying the mark made during disassembly, install
the bearing cap to the connecting rod. If the connecting
rod is new with no index mark, make sure that the bear-
ing locking notches come on the same side as shown.
2. The connecting rod cap bolts and nuts are tightened
using the torque-to-yield method. For this reason, each
bolt to be reused must be checked for elongation before
installation. Whether or not the bolt has been elongated
can be determined by running a nut with fingers through

Fig. 4-31 all the threads of the bolt. If the nut does not turn
smoothly over all the threads, the bolt has been elongat-
ed and must be replaced.
3. Apply engine oil to the threads and bearing surface of
each nut before installation.
4. Finger-tighten the nuts on the bolts, then tighten the
nuts alternately and repeatedly to install the cap proper-
ly.
5. Tighten the nuts to a torque of 27 ± 2 Nm.

Pub. No. PTAE1228 4 - 10