Yamaha YZ 2020 Series, Owner'S Service Manual

Page: 269 / 376

RADIATOR
6-4
EAM30341
CHECKING THE RADIATOR
1. Check:
•
Radiator fins “1”
Obstructions

Clean.
Apply compressed air to the rear of the radia-
tor.
Damage

Repair or replace.
TIP
Correct any flattened fins with a thin, flat-head
screwdriver.
2. Check:
•
Radiator hoses
• Radiator pipes
Crack/damage

Replace.
3. Check:
•
Radiator cap valve opening pressure
a. Install the radiator cap tester adapter “2”
and the radiator cap tester “3” to the radi-
ator cap “1”, and activate the tester to
check whether it can stay for 5 to 10 sec-
onds within standard pressure values.
TIP
Before attaching the cap to the tester, apply wa-
ter to its sealing surface.
No stay

Replace.
EAM30506
INSTALLING THE RADIATOR
1. Fill:
• Cooling system
(with the specified amount of the recom-
mended coolant)
Refer to “CHANGING THE COOLANT” on
page 3-21.
2. Check:
• Cooling system
Leaks

Repair or replace any faulty part.
3. Install:
•
Radiator cap tester “1”
•
Radiator cap tester adapter “2”
4. Activate the tester to apply the test pressure.
NOTICE
ECA24270
• Do not apply such a high pressure as ex-
ceeds the test pressure.
• Make sure that a checkup after the cylinder
Radiator cap valve opening pres-
sure
107.9–137.3 kPa (1.08–1.37
kgf/cm², 15.6–19.9 psi)
Radiator cap tester
90890-01325
Mityvac cooling system tester kit
YU-24460-A
Radiator cap tester adapter
90890-01352
Pressure tester adapter
YU-33984
Radiator cap tester
90890-01325
Mityvac cooling system tester kit
YU-24460-A
Radiator cap tester adapter
90890-01352
Pressure tester adapter
YU-33984
Test pressure value
137.7 kPa (1.37 kgf/cm
2
, 19.9 psi)