DESCRIPTION AND OPERATION
Page 29
Connecting rods are forged steel and are used in
combination with one-piece Monosteel™ steel
pistons. The bearing caps are attached with four
M10 capscrews spaced to prevent misalignment.
The rods and caps are made by a “fracture”
process that requires a cap be assembled with its
original rod. Never attempt to use mismatched
rods and caps.
The piston is fitted with three rings. In the top
groove is a compression ring with a “keystone”
cross section. In the second groove, the
compression ring has a rectangular cross
section. In the third groove is a spring-loaded oil
scraper ring.
17
Figure 17 — Piston Cooling
The pistons are cooled by oil sprayed upward
from a nozzle in the cylinder block into a vertical
duct in the piston. The oil continues through a
circular duct in the piston crown. It flows through
the duct to the wrist pin journal where it passes
through grooves in the bearing to lubricate the
wrist pin.
1. Piston Cooling Nozzle
2. Vertical Duct (Oil Inlet)
3. Circular Duct
4. Outlet to Wrist Pin
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