ENGINE INSPECTION
5-1
ENGINE INSPECTION
MEASURING THE COMPRESSION
PRESSURE
TIP
Insufficient compression pressure will result in a
loss of performance.
1. Measure:
• Valve clearance
Out of specification
→
Adjust.
Refer to “CHECKING THE ENGINE COOL-
ING INLET DUCT (YUM1A/YUM2A)” on
page 3-4.
2. Start the engine, warm it up for several min-
utes, and then turn it off.
3. Remove:
• Seat frames (driver and passenger)
Refer to “GENERAL CHASSIS (1)” on page
4-1.
• Drive belt
Refer to “REPLACING THE DRIVE BELT
(YUM1A/YUM2A)” on page 3-8.
4. Disconnect:
• Spark plug cap
5. Remove:
• Spark plug
NOTICE
Before removing the spark plug, use com-
pressed air to blow away any dirt accumulat-
ed in the spark plug well to prevent it from
falling into the cylinder.
6. Install:
• Extension “1”
• Compression gauge “2”
7. Measure:
• Compression pressure
Out of specification
→
Refer to steps (b) and
(c).
a. Crank the engine by fully pressing the ac-
celerator pedal until the reading on the
compression gauge stabilizes.
WARNING
To prevent sparking, ground the spark plug
lead before cranking the engine.
b. If the compression pressure is above the
maximum specification, check the cylinder
head, valve surfaces and piston crown for
carbon deposits.
Carbon deposits
→
Eliminate.
c. If the compression pressure is below the
minimum specification, pour a teaspoonful
of engine oil into the spark plug bore and
measure again.
Refer to the following table.
8. Install:
• Spark plug
TIP
Before installing the spark plug, clean the spark
plug and gasket surface.
9. Connect:
• Spark plug cap
10.Install:
• Drive belt
Refer to “REPLACING THE DRIVE BELT
(YUM1A/YUM2A)” on page 3-8.
• Seat frames (driver and passenger)
Refer to “GENERAL CHASSIS (1)” on page
4-1.
Extension
90890-04082
Compression gauge
90890-03081
Engine compression tester
YU-33223
2
1
Compression pressure
700–900 kPa (7.0–9.0 kgf/cm²,
102–131 psi)
Compression pressure (with oil applied into the
cylinder)
Reading
Diagnosis
Higher than without oil
Piston ring(s) wear or
damage
→
Repair.
Same as without oil
Piston, valves, cylinder
head gasket, or piston
ring(s) possibly defec-
tive
→
Repair.
T
R
.
.
Spark plug
20 N·m (2.0 kgf·m, 15 lb·ft)
Содержание UMAX
Страница 1: ...SERVICE MANUAL UTILITY VEHICLE J0F F8197 E1 YUM1A YUM2A YUM2E LIT 19616 A0 37...
Страница 2: ......
Страница 6: ......
Страница 8: ......
Страница 25: ...GENERAL SPECIFICATIONS 2 2 1174 kg 2589 lb YUM2E Hill claiming ability 20 YUM1A 15 YUM2A YUM2E...
Страница 33: ...ELECTRICAL SPECIFICATIONS YUM1A YUM2A 2 10 USB fuse 5 A...
Страница 43: ...TIGHTENING TORQUES 2 20...
Страница 46: ...CABLE ROUTING 2 23 YUM1A Front and rear A B C 1 1 1 1 2 3 4 3 4 1 2 3 4 5 6...
Страница 48: ...CABLE ROUTING 2 25 YUM1A Left side A B D C 1 2 3 4 4 4 4 5 6 7 8 9...
Страница 50: ...CABLE ROUTING 2 27 YUM1A Brake and throttle cables A B 1 3 2 3 1 2 2 4 5...
Страница 52: ...CABLE ROUTING 2 29 YUM1A Shift cables 1 2 3 1 2 4 1 2...
Страница 53: ...CABLE ROUTING 2 30 1 Shift control cable forward 2 Shift control cable reverse 3 Plastic band 4 Reverse switch...
Страница 54: ...CABLE ROUTING 2 31 YUM2A Frame top view A B C 1 1 1 2 3 4 5 6 7 8 1 1 1 1 1 2 3 6 9 10 11 12 13 14 15 16 D E...
Страница 56: ...CABLE ROUTING 2 33 YUM2A Front and rear A B C D 1 1 1 1 1 2 2 3 3 4 4 3 4 5 6 7...
Страница 58: ...CABLE ROUTING 2 35 YUM2A Left side A B C D 1 2 3 4 4 4 4 6 7 8 9 10 5...
Страница 60: ...CABLE ROUTING 2 37 YUM2A Brake throttle and shift cables A A B C D 1 1 2 3 3 4 5 4 5 6 6 7 8 9...
Страница 62: ...CABLE ROUTING 2 39 YUM2E Frame top view A A B 1 2 3 4 5 6 7 C D E E 6 6 6 8 9 10 11 12...
Страница 64: ...CABLE ROUTING 2 41 YUM2E Front and rear 1 1 2 3 4 3 A...
Страница 66: ...CABLE ROUTING 2 43 YUM2E Left side B 2 1 3 4 5 6 7 8 9 10 11 A 9...
Страница 68: ...CABLE ROUTING 2 45 YUM2E Brake cable A A B C 1 2 4 3...
Страница 70: ...CABLE ROUTING 2 47...
Страница 73: ......
Страница 96: ...4 YEAR CHECKS 3 23...
Страница 99: ......
Страница 134: ...FRONT SUSPENSION COMPONENTS 4 35 4 3 1 2 5 a...
Страница 138: ...REAR SUSPENSION COMPONENTS 4 39...
Страница 174: ...CRANKSHAFT AND PISTON 5 35...
Страница 196: ...TRANSMISSION YUM1A YUM2A 7 13 Refer to CHECKING THE SHIFT LEVER YUM1A YUM2A on page 3 8...
Страница 202: ...TRACTION MOTOR YUM2E 7 19...
Страница 205: ......
Страница 217: ...CHARGING SYSTEM YUM1A YUM2A 8 12...
Страница 218: ...CHARGING SYSTEM YUM2E 8 13 CHARGING SYSTEM YUM2E CIRCUIT DIAGRAM R R B R B B B B 27 28 27 Battery 28 Charging receptacle...
Страница 223: ...LIGHTING SYSTEM YUM1A YUM2A 8 18...
Страница 227: ...LIGHTING SYSTEM YUM2E 8 22...
Страница 233: ...SIGNALING SYSTEM YUM1A YUM2A 8 28...
Страница 243: ...FUEL INJECTION SYSTEM YUM1A YUM2A 8 38...
Страница 247: ...FUEL PUMP SYSTEM YUM1A YUM2A 8 42...
Страница 284: ...ELECTRICAL COMPONENTS YUM2E 8 79...
Страница 313: ...PC GENIUS GOLF CAR PROGRAMMING SYSTEM YUM2E 9 28...
Страница 315: ......
Страница 316: ......