10.12
Section 10
Internal Components
1. Oil Control Ring (Bottom Groove): Place the
expander in the lowest groove. The ends of the
expander must butt. Do not allow the ends to
overlap; incorrect tension and a loss of oil control
will result.
Place one end of a rail between the upper side of
the expander and groove, and ‘‘wind’’ into position.
Be careful that the end of rail does not scratch the
piston. Repeat this procedure with the second rail
on the lower side of the expander. Position rail gaps
90º from the expander gap and 180º from each
other. Check the assembly to ensure freedom of
movement in the groove. See Figure 10-16.
Install Piston Rings
To install piston rings, proceed as follows:
NOTE: Rings must be installed correctly. Ring
installation instructions are usually included
with new ring sets. Follow instructions
carefully. Use a piston ring expander to install
rings. Install the bottom (oil control) ring first
and the top compression ring last.
2. Middle Compression Ring: Locate and identify the
compression ring with the ‘‘R’’ marking. Using a
piston ring expander, install this ring in the middle
groove with the ‘‘R’’ up towards the top of the
piston. See Figure 10-17.
Top Ring
2nd Ring
(Has R Marking)
Oil Ring
Figure 10-16. Oil Control Ring Details.
Figure 10-17. Middle Compression Ring.
3. Top Compression Ring: Using a piston ring
expander, install the compression ring, with no
markings, into the top groove. It is symmetrical in
design, so it may be installed with either side up.
4. Stagger/position the two compression rings, so
the end gaps are spaced 120º apart, as well as
from the expander gap. See Figure 10-18.
Figure 10-18. Ring Gap Positioning.
Connecting Rods
Inspection and Service
Check bearing area (big end) for excessive wear,
score marks, running and side clearances (Refer to
Section 1, "Specifications, Tolerances, and Special
Torque Values"). Replace rod if scored or excessively
worn.
120º
120º
120º
2
4
3
Install Top Rail in This
Direction Over
Expander Gap
Start Rail as
Indicated
Expander Gap
Install Top Rail in This
Direction Over
Expander Gap
Start Rail as
Indicated
Expander Gap
Expander Gap
Содержание COMMAND PRO CS10
Страница 1: ...SERVICE MANUAL COMMAND PRO CS SERIES 4 12 HP HORIZONTAL CRANKSHAFT...
Страница 20: ...1 18 Section 1 Safety and General Information...
Страница 24: ...2 4 Section 2 Special Tools...
Страница 48: ...6 4 Section 6 Lubrication System...
Страница 54: ...7 6 Section 7 Retractable Starter...
Страница 84: ...8 30 Section 8 Electrical System and Components...
Страница 106: ...9 22 Section 9 Disassembly...
Страница 122: ...10 16 Section 10 Internal Components...
Страница 154: ...ENGINE DIVISION KOHLER CO KOHLER WISCONSIN 53044 LITHO IN U S A FORMNO TP 2503 A ISSUED 12 99 REVISED 8 00 MAILED 9 00...