Kohler Command CV20 Service Manual

Remove Valve Covers
Three valve cover designs have been used. First type
used a gasket and RTV sealant between cover and
sealing surface of cylinder head. Second type had a
black O-ring installed in a groove on underside of cover
and may have metal spacers in bolt holes. Latest design
uses a yellow or brown O-ring, and bolt hole spacers are
molded in place.
1. Remove screws securing each valve cover. Note
valve cover differences for proper location in
reassembly.
2. O-ring type covers should lift off without prying. If
loose spacers are present, save them. With gasket
type, break seal by carefully prying under edges of
cover.
Remove Ignition Modules
1. Disconnect lead(s) from each ignition module.
2. Rotate ywheel so magnet is away from modules.
3. Remove mounting screws and ignition modules.
Note position of ignition modules.
Remove Spark Plugs
Remove spark plug from each cylinder head.
Remove Oil Sentry
™
1. Disconnect lead from Oil Sentry
™
switch.
2. Remove Oil Sentry
™
switch from breather cover.
Remove Inner Bafes and Breather Cover
1. Remove screws securing inner bafes to crankcase.
2. Remove inner (valley) bafes.
3. Remove remaining screws from breather cover.
4. Pry under protruding edge of breather cover with a
screwdriver to break RTV or gasket seal. Do not pry
on sealing surfaces as it could cause damage
resulting in leaks. Most engines use a formed gasket
rather than RTV sealant.
5. Remove breather cover and gasket (if used).
Crankcase Breather System
Breather system is designed to control amount of oil
in head area and still maintain necessary vacuum in
crankcase.
A spring steel reed and stop is mounted on each bank
of crankcase, between lifter bores. When pistons move
downward, air is pushed past reeds into cylinder head
cavities. On cylinder 2, upper end of head is completely
sealed by rocker cover, so a low, positive pressure is
created in head cavity. Cylinder 1 rocker cover has
a hole in it for venting. Bottom nipple of oil separator
canister is tted into hole with a grommet. From top
nipple of canister, a breather hose goes back to air
cleaner base. Air moving into cylinder 1 head cavity is
ltered through oil separator and then is drawn into air
intake.
Upward travel of pistons closes reeds and creates
a low vacuum in lower crankcase. A combination of
low pressure above and low vacuum below forces
any accumulated oil out of cylinder 2 head area into
crankcase. On cylinder 1 bank you have atmospheric
pressure above and vacuum below, again drawing any
oil toward crankcase.
Disassembly/Inspection and Service
6124 690 07 Rev. H KohlerEngines.com

Kohler Command CV20 Specifications

General

Brand	Kohler
Model	Command CV20
Category	Engine
Language	English