Changing The Engine Oil; Checking The Oil Pressure - Yamaha WR450F(Y) 2009 Owner's Service Manual

5. Start the engine and let it warm up
for several minutes.
When the oil tank is empty, never
start the engine.
6. Idle the engine more than 10 sec-
onds while keeping the machine
upright. Then stop the engine and
add the oil to the maximum level.
7. Install:
• Oil tank cap

CHANGING THE ENGINE OIL

1. Start the engine and let it warm up
for several minutes.
2. Stop the engine and place an oil
pan under the drain bolt.
3. Remove:
• Engine guard "1"
• Oil tank plug "2"
• Oil filler cap "3"
• Drain bolt (with gasket) "4"
• Oil filter drain bolt (O-ring) "5"
• Drain bolt (with gasket) "6"
Drain the crankcase and oil tank
of its oil.
4. If the oil filter is to be replaced dur-
ing this oil change, remove the fol-
lowing parts and reinstall them.
Replacement steps:
a. Remove the oil filter element cov-
er "1" and oil filter element "2".
b. Check the O-rings "3", if cracked
or damaged, replace them with a
new one.
c. Install the oil filter element and oil
filter element cover.
Oil filter element cover:
10 Nm (1.0 m•kg, 7.2
ft•lb)
5. Install:
• Gaskets
• Oil filter drain bolt
Oil filter drain bolt:
10 Nm (1.0 m•kg, 7.2
ft•lb)
• Drain bolt (right crankcase)
Drain bolt (right crank-
case):
20 Nm (2.0 m•kg, 14
ft•lb)
• Drain bolt (left crankcase)
Drain bolt (left crank-
case):
20 Nm (2.0 m•kg, 14
ft•lb)
6. Fill:
• Engine oil
Oil quantity:
Periodic oil change:
0.95 L (0.84 Imp qt,
1.00 US qt)
With oil filter replace-
ment:
1.0 L (0.88 Imp qt, 1.06
US qt)
Total amount:
1.2 L (1.06 Imp qt, 1.27
US qt)
3-15
ENGINE
7. Install:
• Oil filler cap "1"
8. Inspect:
• Engine (for oil leaks)
• Oil level
Refer to "CHECKING THE EN-
GINE OIL LEVEL".

CHECKING THE OIL PRESSURE

1. Check:
• Oil pressure
Checking steps:
a. Slightly loosen the oil pressure
check bolt "1".
b. Start the engine and keep it idling
until oil starts to seep from the oil
pressure check bolt. If no oil
comes out after one minute, turn
the engine off so it will not seize.
c. Check oil passages and oil pump
for damage or leakage.
d. Start the engine after solving the
problem(s) and recheck the oil
pressure.
e. Tighten the oil pressure check
bolt.
Oil pressure check bolt:
10 Nm (1.0 m•kg, 7.2
ft•lb)