N67 MNT M28
OVERVIEW
1.14
OCTOBER 2005
Pistons
The pistons integrate the high swirl combustion chamber;
the annular chambers inside the junk ring enable an effective
heat elimination obtained by circulating the lubrication oil
delivered by the spray nozzles mounted on the crankcase.
On the piston skirt the are three seats for the retaining rings;
the first one of these is obtained by a special trapezoidal
section cast iron insert.
The piston rings have different functions and different geo-
metry.
- The 1
st
piston ring has a trapezoidal section and ceramic
chrome plating;
- The 2
nd
piston ring has a a torsional conical rectangular
seal;
- The 3
rd
piston ring has a double oil scraper with internal
spring.
Timing system driving gear
The timing system driving gear machine is a push rods
and rockers type, with a camshaft (1) that is located in the
crankcase and set into rotation directly by the crankshaft.
1. Positioning reference - 2. Crankshaft - 3. Camshaft.
The figure illustrates the position that the toothed wheel has
to have to set the correct timing strokes.
Figure 8
Figure 9
04_014_N
04_015_N
Figure 10
04_317_N
1
2
3
1
Summary of Contents for N67 MNT M28
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