4-14
THEORY OF OPERATION
4
Connecting Rod
See Figure 4-16.
Figure 4-16
The connecting rod is made of carbon steel with an
H-shaped cross section. The rod consists of two pieces,
the main beam (1) and the rod cap (3), which is fastened
with special reamer type rod bolts and nuts. The small
end of the rod is machined for a full-floating piston pin. An
oil jet (2) lubricates the cylinder wall, piston, and piston
pin. The rod bearings (4) are made of an aluminum alloy.
Piston, Piston Rings, and Piston Pin
See Figures 4-17 and 4-18.
Figure 4-17
Figure 4-18
The three-ring, skirt-type, full-floating pistons (1) are
made of an aluminum alloy. The pistons are equipped
with intake valve reliefs (2) machined into the face. The
piston pin bores are equipped with “Ricardo Grooves” (3)
to aid in lubrication. The piston is assembled in the
engine with the floating-fit piston pin for lower friction.
All piston rings are located above the piston pin. The two
top rings are compression rings and the 3rd (6) is an oil
ring.
The 1st ring (4) is of barrel face type designed for
improved initial breaking in. The 2nd ring (5) is of taper
undercut type designed for better oil scraping
performance. A hard chrome is plated on the
circumference of the 1st ring for extended durability.
TN0499
1
2
3
4
TN0527
1
2
3
TN0529
5
4
6
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