Content .. 76 77 78 79 ..

Snowmobile Arctic Cat (2008 year). Manual - part 78

4-28

EFI Component Voltage/Resistance Chart -

Water Temperature

TEMP/C

TEMP/F

VOLTAGE

OHMS

110

230

0.115

129

108

226

0.129

137

106

223

0.143

145

104

219

0.157

153

102

216

0.171

161

100

212

0.185

169

208

0.192

180

205

0.199

191

201

0.206

202

198

0.213

213

194

0.220

224

190

0.235

240

187

0.250

256

183

0.265

273

180

0.280

289

176

0.295

305

172

0.317

327

169

0.339

349

165

0.361

371

162

0.383

393

158

0.405

415

154

0.438

445

151

0.471

475

147

0.504

505

144

0.537

535

140

0.570

565

136

0.598

609

133

0.626

653

129

0.654

697

126

0.682

741

122

0.710

785

118

0.759

849

115

0.808

913

111

0.857

977

108

0.906

1041

104

0.955

1105

100

1.023

1214

1.091

1323

1.159

1432

1.227

1541

1.295

1650

TEMP/C

TEMP/F

VOLTAGE

OHMS

1.377

1800

1.459

1950

1.541

2100

1.623

2250

1.705

2400

1.806

2670

1.907

2940

2.008

3210

2.109

3480

2.210

3750

2.327

4170

2.444

4590

2.561

5010

2.678

5430

2.795

5850

-2

2.901

6510

-4

3.007

7170

-6

3.113

7830

-8

3.219

8490

-10

3.325

9150

-12

3.421

9422

-14

3.517

9694

-16

3.613

9966

-18

-0.4

3.709

10238

-20

-4

3.805

10510

-22

-8

3.885

13688

-24

-11

3.965

16866

-26

-15

4.045

20044

-28

-18

4.125

23222

-30

-22

4.205

26400

-32

-26

4.267

30520

-34

-29

4.329

34640

-36

-32

4.391

38760

-38

-36

4.453

42880

-40

4.515

47000

-42

-44

4.553

55100

-44

-47

4.591

63200

-46

-51

4.629

71300

-48

-54

4.667

79400

-50

-58

4.705

87500

4-29

Troubleshooting Fuel System

Fuel System

(Related Items)

Some components may vary from model to model.

The technician should use discretion and sound judg-

ment when removing and installing components.

Whenever any maintenance or inspection is made on

the fuel system in which fuel leakage may occur, there

should be no welding, smoking, or open flames in the

area.

NOTE: Some illustrations and photographs
used in this section are used for clarity purposes
only and are not designed to depict actual condi-
tions.

Fuel System

(Related Items)

Table of Contents

Oil-Injection Pump................................................. 4-29
Synchronizing Oil-Injection Pump ......................... 4-30
Testing Oil-Injection Pump .................................... 4-31
Testing Oil-Injection Check Valves ........................ 4-32
Fuel Pump (Carbureted Models)........................... 4-32
Air-Intake Silencer (Carbureted Models) ............... 4-33
Air-Intake Silencer (Crossfire/M-Series)................ 4-33
Air-Intake Silencer

(Liquid-Cooled F-Series/T-Series Models) ......... 4-33

Gas Tank/Seat Assembly ...................................... 4-35

Oil-Injection Pump

REMOVING

NOTE: On EFI models to service the oil-injec-
tion pump, the exhaust system and the air silencer
must be removed (see Section 2); then proceed to
step 2.

1. On the 370 cc model, turn the gas tank shut-off

valve to the CLOSED position.

2. Remove the carburetor(s)/throttle bodies and

secure them out of the way in an upright position.

NOTE: On the 570 cc models, secure the carbu-
retors in an upright position to avoid gas from run-
ning out of the vent tubes.

3. Disconnect the oil-supply hose from the pump and

plug to prevent oil drainage.

4. Remove the oil-delivery hose(s) from the adapter

plate(s)/intake flange(s).

5. Disconnect the oil-injection cable/control rod.

6. Remove the two screws, lock washers (if applica-

ble), and washers (if applicable) securing the oil-

injection pump and retainer to the crankcase.

7. Pull the oil-injection pump away from the retainer/

crankcase and account for a gasket/O-ring.

NOTE: Remove the oil-injection pump from the
crankcase only if the O-ring or gasket need to be
replaced.

8. Turn the pump sideways; then remove the lower

union bolt. Account for two washer gaskets.

Remove the pump.

Problem: Too Rich

Condition

Remedy

1. Diagnostic trouble code activated

2. Fuel pressure too high

3. Fuel return hose

4. Injectors leaking

1. Replace problem sensor

2. Replace regulator

3. Service — replace hose — remove obstruction

4. Replace injectors

Problem: Too Lean

Condition

Remedy

1. Diagnostic trouble code activated

2. Fuel pressure too low

3. Vent hose obstructed

4. Fuel filter(s) obstructed

1. Replace problem sensor

2. Replace regulator/fuel pump

3. Remove obstruction

4. Replace fuel filter(s)

4-30

9. Remove the remaining union bolts securing the

check valves to the pump. Account for the washer

gaskets.

10. Remove the check valves. Account for two gas-

kets.

INSTALLING

1. In turn on each front union bolt, install a washer

gasket, check valve, and washer gasket; then

install on the oil-injection pump.

2. Place the gasket and oil-injection pump near the

engine; then install the lower union bolt through a

gasket, check valve, and gasket.

3. Position the oil-injection pump on the engine mak-

ing sure the oil-injection pump gear is correctly

aligned with the oil-injection pump drive gear.

4. Secure the pump with two screws, lock washers (if

applicable), and washers (if applicable). Tighten

screws to 8 ft-lb.

5. Connect the oil-delivery hose(s) to the adapter

plate(s). Secure with clamps.

6. Connect the oil-injection cable/control rod to the

pump and secure.

7. Connect the oil-supply hose to the oil-injection

pump inlet fitting. Secure with the clamp.

8. Bleed the oil-injection system (see Bleeding Oil-

Injection System in this sub-section).

9. Check the oil-injection system synchronization

(see Synchronizing Oil-Injection Pump in this sub-

section). Tighten the jam nuts securely.

NOTE: On EFI models to install the exhaust sys-
tem and the air silencer, see Section 2.

10. Install the carburetor(s)/throttle bodies.

11. On the 370 cc model, turn the shut-off valve to the

OPEN position.

Synchronizing

Oil-Injection Pump

NOTE: On certain models, the oil pump cable
adjuster is located at the juncture of the throttle
cable.

728-713A

742-331A

738-338C

0742-326

INSPECTING/ADJUSTING/

SYNCHRONIZING

1. With the engine off on models with a cable oper-

ated oil pump, disconnect the throttle cable from

the throttle lever.

! CAUTION

Use a 100:1 fuel mixture for the following procedure.

370/570 cc

500 cc

600 cc

800/1000 cc

4-31

2. Pull the throttle cable to the FULL-OPEN posi-

tion; then using a suitable clamping device, secure

the cable in this position.

NOTE: On models with a control rod operated
oil pump, rotate the control arm until it contacts
the stop screw.

3. Check to be sure the mark on the control arm is

aligned with alignment mark on the oil pump boss.

4. If the marks are not aligned, adjust synchroniza-

tion by loosening the jam nut(s) on the adjuster.

Rotate the jam nuts/adjuster nut until proper align-

ment is attained. Tighten jam nut(s).

5. Return the control arm/throttle cable to the

CLOSED position.

NOTE: On models with a cable operated oil
pump, connect the throttle cable to the throttle
lever; then adjust the cable/linkage adjusting nut
so the throttle lever moves approximately 3.2 mm
(1/8 in.) before the oil-injection pump control arm
begins to move. This will ensure the throttle/igni-
tion monitor switch will function properly and will
prevent ignition “cut-out” and spark plug fouling
at low RPM operation.

Testing

Oil-Injection Pump

NOTE: These tests must be made with the
snowmobile and the oil at a “room” temperature of
20°-30° C (68°-86° F).

1. Disconnect the oil pump cable/control rod from

the control arm on the pump.

2. Clamp off the oil-supply hose between the oil res-

ervoir and oil pump; then remove the supply hose

from the pump.

3. Attach a suitable length of clear oil-supply hose to

the oil pump; then using Oil Injection Usage Tool,

fill the hose with Arctic Cat Synthetic APV 2-

Cycle Oil.

NOTE: Use clear hose when performing this test
to simplify the detection of air in the testing equip-
ment.

NOTE: On all engines, use Arctic Cat Synthetic
APV 2-Cycle Oil. Use of any other oil will cause
inaccurate oil consumption readings.

NOTE: When filling the oil-supply hose with oil,
do not insert the usage tool until it is tight in the
hose. There must be enough room around the tip
of the tool and the hose to allow air in the hose to
escape.

4. Fill the usage tool with recommended oil to the 0

line.

5. Wipe the tip of the tool to remove excess oil; then

attach the tool to the oil-supply hose and remove

the bulb.

6. Secure the tool to the oil reservoir by twisting the

rubber strap one half turn and placing the rubber

strap around the tool and the oil reservoir filler

neck.

NOTE: On the F 570, the tool can be secured to
the air silencer.

NOTE: On Crossfire/M-Series to access the oil
pump, tip the snowmobile on its left side; then
using a torx-bit, remove the screws securing the
center belly pan (skid plate) to the front end.

NOTE: On the 600/800/1000 cc, the control rod
must be secured in the FULL-CLOSED (Idle) posi-
tion. It is advisable to secure the rod to a conve-
nient engine component away from any moving
parts. Securing the rod prevents misalignment of
the control arm due to engine/chassis movement.

7. With the control arm secured in the FULL-

CLOSED (Idle) position, start the engine and run

the engine at recommended RPM for 3 minutes.

Compare the amount of oil used against the speci-

fications on the chart in Section 1.

! CAUTION

Care must be taken when securing the cable not to
kink or damage the cable.

! CAUTION

Whenever servicing the oil-injection system, use a
100:1 gas/oil mixture in the gas tank to ensure ade-
quate engine lubrication. Failure to use the 100:1
mixture to the oil-injection system will result in
severe engine damage.

! CAUTION

Assure that the throttle cable/linkage has returned to
the fully closed (idle) position and has not remained
in a partial open position and moves freely from the
open position to the closed position.

! WARNING

Always wear safety glasses when performing this
test.

! WARNING

Keep hands and clothing away from all moving or
rotating parts.

Content .. 76 77 78 79 ..