Kohler Command PRO CH440 Service Manual

10.2
Section 10
Inspection and Reconditioning
Benefi ts
As a result of the reduced compression at cranking
speeds, several important benefi ts are obtained:
1. Manual (retractable) starting is much easier.
Without ACR, manual starting would be virtually
impossible.
2. Electric start models can use a smaller starter and
ba ery that are more practical for the application.
3. ACR eliminates the need for a spark retard/
advance mechanism. A spark retard/advance
mechanism would be required on engines
without ACR to prevent the kickback that would
occur during starting. ACR eliminates this
kickback making manual starting safer.
4. The choke control se ing is less critical with ACR.
In the event of fl ooding, excess fuel is blown out
the opened exhaust valve and does not hamper
starting.
5. Engines with ACR start much faster in cold
weather than engines without ACR.
6. Engines with ACR can be started with spark
plugs that are worn or fouled. Engines without
ACR are more diffi cult to start with those same
spark plugs.
Camshaft & Tappets
Inspection and Service
Inspect the gear teeth of the camsha . If the teeth
are badly worn, chipped, or some are missing,
replacement of the camsha will be necessary. If
unusual wear or damage is evident on either lobe or
the mating tappet, the camsha and both tappets must
be replaced. Check the condition and operation of the
ACR mechanism. See Figure 10-2.
Inspect
Tappets
Inspect
ACR
Inspect
Cam
Lobes
Figure 10-2. Camshaft and Tappet Inspection
Points.
Measure the cam lobe profi le, A and B, as shown in
Figures 10-3 and 10-4 using an outside micrometer
and compare with specifi cations listed.
A
Figure 10-3. Cam Lobe Checking A.
CH270 Cam Lobe Dimension A
Valve Dimension A Service Limit
INTAKE
28.263 mm
(1.1127 in.)
27.585 mm
(1.0860 in.)
EXHAUST
28.346 mm
(1.1160 in.)
27.666 mm
(1.0892 in.)
CH395 Cam Lobe Dimension A
Valve Dimension A Service Limit
INTAKE
32.544 mm
(1.2813 in.)
32.110 mm
(1.2642 in.)
EXHAUST
32.256 mm
(1.2699 in.)
31.790 mm
(1.2516 in.)

Kohler Command PRO CH440 Specifications

General

Brand	Kohler
Model	Command PRO CH440
Category	Engine
Language	English