Kohler Command CV730 User Manual download pdf (Page 83)

5B.16

Section 5B

EFI Fuel System

10. Remove the manifold mounting bolts and separate

the throttle body/manifold from the engine

leaving the TPS, fuel rail, air baffle, injectors and

line connections intact. Discard the old gaskets.

11. Position the manifold assembly over an

appropriate container and turn the key switch

“on” to activate the fuel pump and pressurize the

system. Do not turn switch to “start” position.

12. If either injector exhibits leakage of more than two

to four drops per minute from the tip, or shows

any sign of leakage around the outer shell, turn

the ignition switch off and replace the injector as

follows.

13. Depressurize the fuel system following the

procedure in the fuel warning on page 5B.2.

Remove the two fuel rail mounting screws.

14. Clean any dirt accumulation from the sealing/

mounting area of the faulty injector(s) and

disconnect the electrical connector(s).

15. Pull the retaining clip off the top of the injector(s).

Disconnect the fuel rail and remove the injector(s)

from the manifold.

16. Reverse the appropriate procedures to install the

new injector(s) and reassemble the engine. Use

new O-Rings any time an injector is removed (new

replacement injectors include new O-Rings).

Lubricate O-Rings lightly with oil. Torque the fuel

rail and blower housing mounting screws to

3.9 N·m (35 in. lb.), and the intake manifold and

air cleaner mounting screws to 9.9 N·m

(88 in. lb.).

Injector problems due to dirt or clogging are generally

unlikely due to the design of the injectors, the high fuel

pressure, and the detergent additives in the gasoline.

Symptoms that could be caused by dirty/clogged

injectors include rough idle, hesitation/stumble during

acceleration, or triggering of fault codes related to fuel

delivery. Injector clogging is usually caused by a

buildup of deposits on the director plate, restricting

the flow of fuel, resulting in a poor spray pattern.

Some contributing factors to injector clogging include

higher than normal operating temperatures, short

operating intervals, and dirty, incorrect, or poor quality

fuel. Cleaning of clogged injectors is not

recommended; they should be replaced. Additives and

higher grades of fuel can be used as a preventative

measure if clogging has been a problem.

Figure 5B-19. Injector Inspection Points.

1. Engine must be cool. Depressurize fuel system

through test valve in fuel rail.

2. Disconnect spark plug leads from spark plugs.

3. Remove the air cleaner outer cover, inner wing

nut, element cover and air cleaner element/

precleaner. Service air cleaner components as

required.

4. Remove the two screws securing the air cleaner

base to the throttle body manifold. Remove the

air cleaner base to permit access to the injectors.

Check condition of air cleaner base gasket,

replace if necessary.

5. Remove the flywheel screen if it overlaps the

blower housing.

6. If the engine has a radiator-type oil cooler

mounted to the blower housing, remove the two

oil cooler mounting screws.

7. Remove the blower housing mounting screws.

Note the location of the plated (silver) screw

attaching the rectifier/regulator ground lead.

Remove the blower housing.

8. Thoroughly clean the area around and including

the throttle body/manifold and the injectors.

9. Disconnect the throttle linkage and damper

spring from the throttle lever. Disconnect the TPS

lead from the harness.

Check For Leaks

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Kohler Command CV730 User Manual Page 83

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